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Journal articles on the topic 'Textile chemistry. Dyes and dyeing'
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Gaffer, Hatem, Hamada Mashaly, Shaymaa Hassan Abdel-Rhman, and Mamdouh Hammouda. "Synthesis of novel dyes based on curcumin for the creation of antibacterial silk fabrics." Pigment & Resin Technology 46, no. 6 (November 6, 2017): 478–84. http://dx.doi.org/10.1108/prt-11-2016-0112.
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Purpose The study reported in this paper aims to synthesize some new curcumin containing sulphadiazine and sulphathiazole dyestuffs and study their application in dyeing silk fabrics rendering the dyed fabric antibacterial. Design/methodology/approach Simultaneous dyeing and antibacterial finishing for silk fabric using a new antibacterial acid dye having a modified chemical structure to curcumin were conducted. This modification of curcumin dye was carried out by introducing sulphonamide containing heterocyclic rings sulphadiazine and sulfathiazole through coupling with curcumin. All newly synthesized dyes were characterized by elemental analyses and spectral data (IR, 1H-NMR and MS). The dyeing characteristics of these dyestuffs were evaluated at optimum conditions. Antibacterial activities of the dyed samples at different concentrations of both dyes were studied against gram-positive (Staphylococcus aureus) and gram-negative (Salmonella typhimurium) bacteria. Findings The synthesized curcumin-containing sulphonamide dyes were applied on silk fabrics. The modified dyes exhibited good fastness properties compared to curcumin dye at optimum conditions. It was found that synthesized dyes exhibit good fastness and antibacterial properties efficient against gram-positive and gram-negative bacteria. The dyed silk fabrics showed higher antibacterial efficacy after many times of washing. Originality/value Curcumin, a common natural dye used for fabric and food colouration, was used as an antimicrobial finish due to its bactericidal properties on dyed textiles. A common dyeing process could provide textiles with colour as well as antimicrobial properties. Novel antibacterial dyestuff containing curcumin moieties with sulphonamide coupler components were shown to be an interesting natural colorant for silk with high antimicrobial ability of the dyed silk fabrics. This work has afforded a new acid dye that can be used in medical textile.
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Smelcerovic, Miodrag, Dragan Djordjevic, and Mile Novakovic. "Textile dyeing by dyestuffs of natural origin." Chemical Industry 60, no. 5-6 (2006): 120–28. http://dx.doi.org/10.2298/hemind0606120s.
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The textile industry is one of the biggest industrial consumers of water especially dye houses which utilize synthetic dyes and other chemicals. Natural dyes are generally environmental friendly and have many advantages over synthetic dyes with respect to production and application. In recent years, there has been an interest in the application of these dyes due to their bio-degradability and higher compatibility with the environment. A review of previous work in the field of applying dyestuffs of natural source as possible textile dyes is given. From an ecological viewpoint, the substitution of chemical dyes by 'natural products' in textile dyeing may be feasible and may represent not only a strategy to reduce risks and pollutants, but also an opportunity for new markets and new businesses which can develop from the inclusion of ecology in trade policy.
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Simion Beldean-Galea, Mihail, Florina-Maria Copaciu, and Maria-Virginia Coman. "Chromatographic Analysis of Textile Dyes." Journal of AOAC INTERNATIONAL 101, no. 5 (September 1, 2018): 1353–70. http://dx.doi.org/10.5740/jaoacint.18-0066.
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Abstract The textile industry uses many raw materials (natural and synthetic dyes and fibers) and different dyeing techniques that can be considered important pollutants with a negative impact on the environment (toxic working conditions, discharged wastewater, and contamination). Although synthetic dyes are intensively used, offer a wide range of colors and hues and properties of adhesion, longevity, and resistance to sunshine and chemical processes, and are cost-effective, they have begun to be restricted by many textile producers because they are nonbiodegradable and have toxic, carcinogenic, and mutagenic effects that generate some imbalances in plant, animal, and human life. Natural dyes of plant and animal origin exhibit very good tolerance to washing, rubbing, and light and are biodegradable and nontoxic; these properties have led to a call for the renewed use of these dyes. Modern analytical techniques (solid-phase extraction, spectrophotometry, HPLC, HPTLC, capillary electrophoresis) with different spectroscopy (UV-Vis, diode-array detection, pulsed amperometric detection) and/or MS/tandem mass spectrometry detectors have an important role in the textile industry in obtaining essential information about dyeing techniques, material origin, historical trade routes of ancient textiles, and environmental pollution. For this purpose, isolation, separation, and quantification methods of natural and synthetic textile dyes from various matrices (ancient and modern fabrics, water, biota, etc.) are presented.
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Al-Soliemy, Amerah, and Fatimah Al-Zahrani. "Synthesis of novel disperse dyes based on curcumin for the creation of antibacterial polyester fabrics." Pigment & Resin Technology 48, no. 6 (November 4, 2019): 502–7. http://dx.doi.org/10.1108/prt-10-2018-0112.
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Purpose This study aims to synthesize some new curcumin containing Aroyl derivatives dyestuffs and study their application in dyeing polyester fabrics, rendering to their antibacterial evaluation. Design/methodology/approach Modification of curcumin dye was carried out by introducing benzoyl rings through coupling with curcumin. All newly synthesized dyes were characterized by elemental analyses and spectral data (IR, 1 H-NMR and MS). Moreover, the optimal dyeing condition was assigned. Antibacterial activities of the dyed samples at different concentrations of both dyes were studied against gram positive (Staph aureus) and gram-negative (Salmonellatyphimurium) bacteria. Findings Synthesized curcumin containing benzoyl dyes were applied on polyester fabrics. Meanwhile, these synthesized dyes showed reasonable results towards fastness properties at optimal conditions matching the curcumin dye. In addition to their good fastness assets, synthesized dyes displayed antibacterial efficacy towards both gram positive and gram-negative bacteria. The dyed polyester fabrics showed higher antibacterial efficacy after multiple events of washing. Research limitations/implications The synthesized benzoyl containing curcumin moiety was not described before. Practical implications Disperse dyes derived from curcumin were prepared via coupling of various diazonium salts of p-aminobenzaldhyde, p-aminoacetopheneone, p-aminobenzoic acid and p-aminobenzoyl chloride with curcumin. The resulting disperse dyes were applied on polyester fabrics at optimal conditions, and antibacterial efficacy of dyed fabrics were evaluated. Originality/value Curcumin being was used in food colouration and was effective for dyeing and antimicrobial finishing on textile fabrics. Novel antibacterial dyestuff containing curcumin moieties with benzoyl amine coupling components showed interesting colourant for polyester fabrics. This work introduced innovative disperse dyes for medical textile applications.
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Shams-Nateri, A., E. Dehnavi, and E. Zahedi. "PCA-spectroscopy study of common salt effect on solubility of direct dye." Pigment & Resin Technology 46, no. 5 (September 4, 2017): 362–70. http://dx.doi.org/10.1108/prt-11-2015-0108.
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Purpose This work aims to explain the effect of common salt on absorbance spectra and solubility of textile direct dyes, which is important in analysing and reusing wastewater of dyeing process. Design/methodology/approach Several textile dyes such as Direct red 243, Direct yellow 86 and Direct blue 201 solutions with and without NaCl salt were used to study the effect of common salt on solubility of textile direct dyes. Several methods such as derivative spectrophotometry, principal component analysis and colorimetric techniques were used to analyse the absorbance spectra of dye solution. Findings The obtained results indicate that the effect of common salt on absorbance spectra and solubility of textile direct dye depends on the chemical structure of dyes. The NaCl salt significantly affects the solubility of Direct red 243 (red dye) and Direct yellow 86 (yellow dye) which have Azo compounds containing four SO3 functional groups. But the NaCl salt does not change the solubility of Direct blue 201 (Blue dye) which has Azo compound containing two SO3 functional groups. Also, the NaCl salt decreases the accuracy of dye concentration prediction. Practical implications During reusing wastewater of dyeing process, the amount of dyes has been evaluated via absorbance spectra of dye solution. Originality/value This work explains the effect of common salt on solubility of textile direct dyes and the accuracy of dyes concentration prediction.
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Jung, Jong Sun, and Seong Hun Kim. "Application of smectite for textile dyeing and fastness improvement." RSC Advances 9, no. 63 (2019): 36631–39. http://dx.doi.org/10.1039/c9ra05768d.
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Shams Nateri, A., E. Dehnavi, A. Hajipour, and E. Ekrami. "Dyeing of polyamide fibre with cochineal natural dye." Pigment & Resin Technology 45, no. 4 (July 4, 2016): 252–58. http://dx.doi.org/10.1108/prt-05-2015-0043.
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Purpose The aim of the paper was to study the effects of mordanting methods on the absorption behaviour of cochineal natural dye on polyamide fibres. Design/methodology/approach Iron sulphate and aluminium potassium sulphate salts were used as mordanting agents, and bottom mordanting, meta-mordanting and after mordanting methods were applied in the dyeing of polyamide samples with the cochineal natural dye. Colourimetric evaluations were carried out, and the principal component analysis was used to investigate the spectrophotometric properties of the dyed samples. Fastness properties of the dyed samples were also assessed. Findings The obtained results indicate that the method of mordanting has a great effect on the obtained shades, absorption behaviour and fastness properties. Based on the results, it was concluded that polyamide fabrics could be successfully dyed with cochineal and combination of dyeing with different mordanting methods, and different mordanting agents would develop the range of obtainable shades. Originality/value The textile and apparel industries have been widely criticised for their role in polluting the environment. So, the use of synthetic dyes has been limited and the use of natural dyes has increased. The literature survey indicates that there have been relatively few works investigating the dyeing of polyamide with cochineal natural dye. This research studies the effects of mordanting methods and mordant types on colourimetric and fastness properties of cochineal-dyed polyamide samples.
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Adamek, Ewa, Wojciech Baran, Justyna Ziemiańska, and Andrzej Sobczak. "The Comparison of Photocatalytic Degradation and Decolorization Processes of Dyeing Effluents." International Journal of Photoenergy 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/578191.
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Treatment of dye effluents resulting from the industrial scale dyeing of cotton, polyacrylic fibres, leather, and flax fabrics by photocatalytic methods was investigated. Photocatalytic processes were initiated by UV-a light (λmax366 nm) and were conducted in the presence of TiO2, TiO2/FeCl3, or FeCl3as photocatalysts. It was found that the photocatalytic process carried out with TiO2and TiO2/FeCl3was the most effective method for decolorization of textile dyeing effluents and degradation of dyes, except for effluents containing very high concentrations of stable azo dyes. During the photocatalytic degradation of anionic dyes, a mixture of TiO2/FeCl3was more effective, while in the case of cationic dyes, more suitable seems to be TiO2alone.
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Tang, Songsong, Guoqiang Chen, and Gang Sun. "Computer-Assisted Design of Environmentally Friendly and Light-Stable Fluorescent Dyes for Textile Applications." International Journal of Molecular Sciences 20, no. 23 (November 27, 2019): 5971. http://dx.doi.org/10.3390/ijms20235971.
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Five potentially environmentally friendly and light-stable hemicyanine dyes were designed based on integrated consideration of photo, environmental, and computational chemistry as well as textile applications. Two of them were synthesized and applied in dyeing polyacrylonitrile (PAN), cotton, and nylon fabrics, and demonstrated the desired properties speculated by the programs. The computer-assisted analytical processes includes estimation of the maximum absorption and emission wavelengths, aquatic environmental toxicity, affinity to fibers, and photo-stability. This procedure could effectively narrow down discovery of new potential dye structures, greatly reduce and prevent complex and expensive preparation processes, and significantly improve the development efficiency of novel environmentally friendly dyes.
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Dixit, Bharat, Hitendram Patel, and Dhirubhai Desai. "Synthesis and application of new mordent and disperse azo dyes based on 2,4-dihydroxybenzophenone." Journal of the Serbian Chemical Society 72, no. 2 (2007): 119–27. http://dx.doi.org/10.2298/jsc0702119d.
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Novel mordent and disperse azo dyes were prepared by the coupling of various diazo solutions of aromatic amines with 2,4-dihydroxybenzophenone. The resultant dyes were characterized by elemental analyses as well as IR and NMR spectral studies. The UV-visible spectral data have also been discussed in terms of structural property relationship. The dyeing assessment of all the dyes was evaluated on wool and polyester textile fibers. The dyeing of chrome treated (i.e., chrome mordented) wool and polyesters was also monitored. The results show that a better hue was obtained on mordented fibers. The results of the anti-bacterial properties of the chrome dyes revealed that the toxicity of these dyes against bacteria is fairly good. .
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Ledakowicz, Stanisław, Lucyna Bilińska, and Renata Żyłła. "Application of Fenton's Reagent in the Textile Wastewater Treatment Under Industrial Conditions." Ecological Chemistry and Engineering S 19, no. 2 (January 1, 2012): 163–74. http://dx.doi.org/10.2478/v10216-011-0013-z.
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Application of Fenton's Reagent in the Textile Wastewater Treatment Under Industrial Conditions Application of reactive dyes is very popular in textile industry as these dyestuffs are characterized by good fastness properties. Constapel et al in 2009 estimated the production of this type of dyes for over 140,000 Mg/year. The reactive dyes are mostly (50%) employed for coloration of cellulosic fibers, however they can also be applied on wool and nylon. Unfortunately, they possess a low degree of fixation (50÷90%), since the functional groups also bond to water, creating hydrolysis and the excess of dyes applied cause a colored pollution of aqueous environment. Moreover, dyeing process requires the use of: electrolytes in the form of aqueous solutions of NaCl or Na2SO4 in the concentration up to 100 g/dm3, alkaline environment (pH > 10) and textile auxiliary agents (including detergents). Therefore, the wastewater generated during the reactive dyeing processes is characterized by high salinity, pH value and color, and due to low value of the BOD5/COD ratio are nonbiodegradable. The successful methods of textile wastewater treatment could be Advanced Oxidation Processes (AOPs), amongst which the Fenton reagent seems to be most promising as it is the cheapest and easy in use. Based on the newest literature survey it was found that many successful tests with Fenton reaction were performed mainly in decolorization. However, not enough attention was devoted to decolorization of real industrial wastewater containing dyes, detergents and salts NaCl, or Na2SO4. The experiments carried out in a laboratory scale were focused on the impact of NaCl and textile auxiliary agent (liquid dispersing and sequestering agent) on an inhibition of decolorization process by Fenton's reagent. The objects of the investigation were synthetic mixtures simulating the composition of real textile wastewater as well as the real industrial wastewater generated in the reactive dyeing. The inhibition of the Fenton decolorization in the presence of NaCl and liquid dispersing and sequestering agent was demonstrated. Additional experiments using pulse radiolysis were carried out in order to confirm the inhibition of chloride in the decolorization process.
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Vankar, Padma S., Dhara Shukla, Samudrika Wijayapala, and Asish Kumar Samanta. "Innovative silk dyeing using enzyme and Rubia cordifolia extract at room temperature." Pigment & Resin Technology 46, no. 4 (July 3, 2017): 296–302. http://dx.doi.org/10.1108/prt-06-2016-0065.
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Purpose Natural dyes are mostly used for dyeing of natural fibre textiles to improve their eco-friendly features. For successful commercial use of natural dyes, the appropriate and standardized dyeing techniques need to be adopted. Appropriate scientific techniques or procedures need to be derived from scientific studies on dyeing methods, dyeing process variables, dyeing kinetics and compatibility of selective natural dyes with minimal use of hazardous chemicals. Design/methodology/approach In the present study, different enzymes (protease, amylase, xylanase, pectinase, phytase) were used efficiently with Rubia dye by using simultaneous and two-step processes; both the processes were developed with an aim for conservation of time and energy, for the ease of industrial use. The highlights of the study are twofold: eco-friendly natural dyeing by using enzyme replacing metal mordant and room temperature dyeing, which is a completely new concept. Findings Experiments showed that enzymatic treatment can give good colour strength to silk fabric using Rubia as a dye source and has good potential for commercial dyeing. It is a non-toxic dye. Use of enzymes were a deliberate attempt to avoid metal mordanting in silk dyeing, as it would make textile dyeing eco-friendlier. The order of reactivity of enzymes in one-step process was found to be protease > phytase > xylanase > amylase > pectinase. Similarly, for two-step dyeing process, the order of reactivity of enzymes observed was protease > amylase > xylanase = pectinase > phytase. Protease enzyme was the best option in both the cases. Overall, it can be concluded that in the case of enzymatic treatment, the two-step process was better in terms of larger K/S values, colour coordinate values and dye adherence. Research limitations/implications A new domain of room temperature dyeing technique has been introduced. Originality/value In the present study, different enzymes (protease, amylase, xylanase, pectinase, phytase) were used efficiently with Rubia dye by using simultaneous and two-step processes; both the processes were developed with an aim for conservation of time and energy, for the ease of industrial use. The highlights of the research are twofold: eco-friendly natural dyeing by using enzyme replacing metal mordant and room temperature dyeing, which is a completely new concept. Overall, the ease of use for industrial application. Rubia dye from Sri Lanka has been used in conjunction with different enzymes to show that metal mordanting can be easily replaced by the use of eco-friendly and biodegradable enzymes. The most attractive feature of this study is the low-temperature dyeing at 30-40°C. For any dyeing house, this process can be easily adapted on jigger, winch or even in continuous padding machine. Good fastness properties and dye adherence have been the other highlights of this study.
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Slama, Houda Ben, Ali Chenari Bouket, Zeinab Pourhassan, Faizah N. Alenezi, Allaoua Silini, Hafsa Cherif-Silini, Tomasz Oszako, Lenka Luptakova, Patrycja Golińska, and Lassaad Belbahri. "Diversity of Synthetic Dyes from Textile Industries, Discharge Impacts and Treatment Methods." Applied Sciences 11, no. 14 (July 6, 2021): 6255. http://dx.doi.org/10.3390/app11146255.
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Natural dyes have been used from ancient times for multiple purposes, most importantly in the field of textile dying. The increasing demand and excessive costs of natural dye extraction engendered the discovery of synthetic dyes from petrochemical compounds. Nowadays, they are dominating the textile market, with nearly 8 × 105 tons produced per year due to their wide range of color pigments and consistent coloration. Textile industries consume huge amounts of water in the dyeing processes, making it hard to treat the enormous quantities of this hazardous wastewater. Thus, they have harmful impacts when discharged in non-treated or partially treated forms in the environment (air, soil, plants and water), causing several human diseases. In the present work we focused on synthetic dyes. We started by studying their classification which depended on the nature of the manufactured fiber (cellulose, protein and synthetic fiber dyes). Then, we mentioned the characteristics of synthetic dyes, however, we focused more on their negative impacts on the ecosystem (soil, plants, water and air) and on humans. Lastly, we discussed the applied physical, chemical and biological strategies solely or in combination for textile dye wastewater treatments. Additionally, we described the newly established nanotechnology which achieves complete discharge decontamination.
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VERMA, MONA, NEHA GAHLOT, SAROJ S. J. SINGH, and NEELAM M. ROSE. "ENHANCEMENT OF DYE ABSORPTION OF COTTON FABRIC THROUGH OPTIMIZATION OF BIOPOLYMER TREATMENT." Cellulose Chemistry and Technology 55, no. 3-4 (April 20, 2021): 343–54. http://dx.doi.org/10.35812/cellulosechemtechnol.2021.55.33.
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"Environmental pressure is pushing towards the ‘green’ alternatives to synthetic or petro-chemically derived products. Biopolymers are replacement materials suitable for different chemical processes. The surface modification of textile fibres using biopolymers is considered as the best route for modern textile treatments, to minimize the generation of wastewater containing salts, unfixed dye and other chemicals, which may affect the environment and human health. To avoid these problems, the pretreatment of cotton with biopolymers is a safe option in eco-friendly dyeing. In the present work, chitosan was selected for application on cotton textile for improving its dyeing efficiency with natural dye (onion skin). Chitosan is a versatile polycationic polysaccharide possessing hydroxyl and amino functional groups, which can easily be fabricated with desired functional properties. The chitosan treatment was standardized on the basis of dyeing properties, such as percent dye absorption, colour strength (K/S) and wash fastness. When the chitosan treatment was applied with optimized parameters, it was found that the chitosan treated onion skin dyed fabric showed higher dye absorption (66.17%), colour strength (16.52) and wash fastness rating than the alum treated dyed fabric. Thus, the chitosan treatment enhanced the dyeing properties of cotton fabric towards the application of natural dye (onion skin), without using any metallic salt. To conclude, the chitosan treatment is a safe and environmentally benign route to improve the natural dye absorption of cotton fabrics."
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Copaciu, Florina-Maria, Dorina Simedru, and Maria-Virginia Coman. "Determination of Three Chromium Textile Azo Dyes in Wastewater by SPE-LC-ESI(–)-MS/MS." Journal of AOAC INTERNATIONAL 101, no. 5 (September 1, 2018): 1422–28. http://dx.doi.org/10.5740/jaoacint.18-0059.
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Abstract In the present work, a procedure to determine three textile azo dyes, chromium-complexes [Nylosan Dark Brown (NDB), Lanasyn Dark Brown (LDB), and Lanasyn Red (LR)], from wastewater using solid-phase extraction (SPE) followed by LC-electrospray ionization negative mode tandem mass spectrometry (LC-ESI(–)-MS/MS) has been developed. The extraction/concentration and recovery degree of these dyes from liquid matrices were done on Strata WAX/NH2 cartridges. The chromatographic separation was performed using a Luna C18 (2) 100Å column by isocratic elution with a methanol–acetonitrile–water (0.2% formic acid and 2 mM ammonium formate) mixture. The linearity, the LOD, and the LOQ were determined for each textile dye. The accuracy, the precision (intra- and inter-day), and the matrix effect were also performed for the validation of the developed procedure. These chromium-complex azo dyes often used in the dyeing process by a textile factory in Romania were monitored in the influent and effluent wastewater from a treatment plant situated in its area. Applying the developed SPE-LC-ESI(–)-MS/MS procedure, the following textile dyes were detected (ng/L) in the collected wastewater samples during a 24-h period: NDB 150.1, LDB 200.6, and LR 89.0–244.0 in influents and NDB 22.8, LDB 78.6, and LR 74.0 in effluents.
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Mahne, Dunja, Urška Lavrenčič Štangar, Polonca Trebše, and Tjaša Griessler Bulc. "TiO2-Based Photocatalytic Treatment of Raw and Constructed-Wetland Pretreated Textile Wastewater." International Journal of Photoenergy 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/725692.
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Approximately, 15% of the total textile colorant production is estimated to be lost during dyeing and processing of textile fibres. If left untreated, these wastewaters can represent a serious environmental threat. In the present paper a combination of photocatalytic and biological degradation of prepared textile wastewaters (simulation of real textile effluent) is presented. Samples have been monitored through the course of photocatalytic experiments: change in UV-VIS absorbance spectra and complete decolouration were achieved for all three tested dyed wastewaters; however, only partial COD removal was achieved with photocatalytic oxidation (PCOx) and photocatalytic ozonation (PCOz). Toxicity test (Vibrio fischeri) of untreated and pretreated (constructed wetland, CW) samples showed a decrease in toxicity values only for the red-dyed wastewater. Comparison of efficiency of PCOx and PCOz for decolouration and mineralization of three structurally different dyes (anthraquinone and two azo dyes) has been done. CW pretreatment caused faster decolouration and substantial COD removal in PCOx (up to 45%). Pretreatment also accelerated decolouration during PCOz, but it accelerated COD removal only in the case of red-dyed wastewater due to short irradiation times applied.
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Degano, Mattonai, Sabatini, and Colombini. "A Mass Spectrometric Study on Tannin Degradation within Dyed Woolen Yarns." Molecules 24, no. 12 (June 22, 2019): 2318. http://dx.doi.org/10.3390/molecules24122318.
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Natural tannins from various plants have been used throughout human history in textile dyeing, often as mordant dyes. The ageing behavior of these dyes is a challenge in conservation science, requiring a thorough knowledge of the textile–mordant-dye system. In this work, we analyzed reference wool yarns dyed with natural tannins from oak gallnuts, walnut (Juglans regia), and catechu (Acacia catechu), after artificial ageing. To gain insights on the composition of the dyestuffs and on how they aged, an analytical procedure based on extraction with Na2EDTA/DMF (ethylenediaminetetraacetic acid/dimethylformamide) and high-performance liquid chromatography (HPLC) analysis using high-resolution mass spectrometry detection was used. Since conventional reversed-phase (RP) columns usually show poor retention efficiency of highly polar compounds such as tannins, an RP-amide embedded polar group stationary phase was used to achieve optimal retention of the most polar compounds. Tannins from oak gallnuts showed little degradation after ageing, while a significant increase in the content of hydroxybenzoic acids was observed for tannins from walnut and catechu. Finally, the analytical procedure was applied to characterize the tannin dyes in historical tapestries from the 15th to 16th century, and the results were discussed in comparison with the reference yarns.
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Faisal, Saira, Aurelio Tronci, Muhammad Ali, Erum Bashir, and Long Lin. "Right-first-time dyeing: a design of experiments approach for the optimisation of dyeing-processes using hard water." Pigment & Resin Technology 48, no. 5 (September 2, 2019): 449–55. http://dx.doi.org/10.1108/prt-05-2019-0045.
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Purpose The purpose of this study was to optimise the dyeing conditions to achieve right-first-time dyeing in hard water. Owing to the persistent water scarcity for more than two decades now, the textile industry in Pakistan is forced to rely on high-mineral-content ground water for use in textile wet processing. Furthermore, the limited amount of municipal water that is at the disposal of the textile industry is also high in mineral content. Thus, on the large scale, water hardness has become an acute problem for the textile processor. In particular, in the dyeing process, water hardness is known to have crucial effects. However, to-date, no systematic study has been conducted on this aspect of textile dyeing. Design/methodology/approach In this study, 32 full factorial design was used to optimise the dyeing conditions to achieve right-first-time dyeing in hard water. Thus, cotton fabric was dyed with Red Reactive dye (of dyebath concentration at 5, 10 and 15 g/L) in prepared hard water (of hardness at 10, 40 and 70°dH), respectively. Analysis of variance, coefficient of determination (R2) and p-values for the models were used to evaluate the adequacy of the predictive models. The surface plots of the effects were studied to further examine the interactions of two independent variables. Derringer’s desirability function was used to determine the optimum levels of each variable. Findings Three levels for both independent variables generate second-order polynomial models to predict the colour strength, lightness, red/green, yellow/blue and total colour difference values of dyed cotton. The obtained predictive models point out the considerable influence of both water hardness and dye concentration on right-first-time dyeing. Originality/value Such a finding enabled the dye-mill to produce the correct shade at water hardness of 10°dH and 15 g/L dye concentration, without the need for corrective reprocessing.
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Bhandari, Netra Lal, Jyoti Ghimire, Sunita Shrestha, Ganesh Bhandari, Sitaram Bhattarai, and Rameshwar Adhikari. "Green Extraction, Characterization, Applications and Antimicrobial Analysis of Natural Dye from Phyllanthus emblica." Asian Journal of Chemistry 33, no. 2 (2021): 404–10. http://dx.doi.org/10.14233/ajchem.2021.23008.
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Global consciousness towards the organic value of eco-friendly products has attracted the interest of people towards the use of naturally dyed textiles and organic mordants. The present study has been focused not only on exploring the bio-colourant activity of Phyllanthus emblica (Amala) but also on the application of natural mordant for textile dyeing and analysis of its medicinal properties. It has been discovered from the investigation that biomordants like extract of Aloe vera’s as well as extract of mango’s bark extract were able to evince their characteristic colour ameliorate behaviour close to synthetic ones. Besides, the disparity in absorbance band in ultraviolet spectroscopy, distinction in functional groups and differences in surface morphology of two extracted dyes were observed that provided information on colour variation in the cotton fabrics. An eagle gray shade and brown-hued on the cotton fabric were noticed from water and ethanol extracted dyes, respectively. Further, it is confirmed that the natural dyes contain bioactive phytochemicals like tannins, phenols and flavonoids that provide a significant antibacterial activity which will help it to be beneficially utilized in protective medical clothing.
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Abdallah, Amira E. M., and Rafat M. Mohareb. "Uses of 4,4-dicyano-3-phenyl-but-3-enoic acid phenylamide for the synthesis of new compounds: antimicrobial and textile finishing evaluations." Pigment & Resin Technology 48, no. 2 (February 21, 2019): 89–107. http://dx.doi.org/10.1108/prt-11-2017-0085.
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Purpose This work aims to synthesize a series of novel acyclic and/or heterocyclic systems, as precursors for dyes with potential antimicrobial activity that could be used for simultaneous dyeing and antimicrobial textile finishing. Thus, a series of novel pyridine, thiophene and pyrazolo[3,4-b]pyridine derivatives were synthesized, and their antimicrobial and textile finishing properties were studied and evaluated. Design/methodology/approach The synthesis, structure elucidation and antimicrobial activities of the newly synthesized compounds based on 4,4-dicyano-3-phenyl-but-3-enoic acid phenylamide (1) were demonstrated. The minimal inhibitory concentration in μg/mL of the compounds showed significant antimicrobial activity against most of the tested organisms. On the other hand, their spectral characteristics and fastness properties were measured and evaluated. Antimicrobial activities of the dyed fabrics in terms of inhibition zones (mm) were measured and evaluated. Findings A series of novel heterocyclic compounds (Schemes 1-3) were synthesized based on starting material (1). Compounds (1), 2, 4a, 8a and 9c exhibited comparable or even higher antibacterial activities than the selected standards (ampicillin), while compounds 2, 3c, 3d, 4a and 8b revealed higher antifungal activities than the selected standard (cycloheximide). On the other hand, some dyes showed high antimicrobial evaluation on the dyed fabrics (nylon 66, acetate and polyester) expressed as size (mm) of inhibition zones (Tables I-IV). Practical implications Results revealed that many hydrazo and azo derivatives were synthesized from some pyridines and thiophenes. The antimicrobial evaluation and textile finishing of the newly synthesized products revealed significant and potent values of antimicrobial activity. Originality/value All the synthesized compounds were novel and most of them exhibited higher antimicrobial activities than the selected standards antibiotics, thus are valuable for simultaneous dyeing and antimicrobial functional finishing of textile fabrics.
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BENLI, HÜSEYIN. "ULTRASOUND ASSISTED BIO-DYEING OF SOME TEXTILE MATERIALS WITH BLACK CARROT (DAUCUS CAROTA L.) EXTRACT." Cellulose Chemistry and Technology 55, no. 3-4 (April 20, 2021): 325–42. http://dx.doi.org/10.35812/cellulosechemtechnol.2021.55.32.
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"This study has been conducted to find out whether black carrot extract can be used as a dyestuff to dye textile materials. For this purpose, the two most widely used textiles (namely, cotton and wool) have been selected. The extractions from the black carrot were performed directly in the dyebath. An ultrasonic bath at 80 °C for 60 minutes was used to increase extraction efficiency. All the dyeing processes were carried out at 100 °C for 60 minutes, both with and without some metal salts, using two different dye concentrations in 1:1 and 1:10 ratios (material weight:dye extraction volume). Six different metal salts, i.e. K2Cr2O7, CuSO45H2O, FeSO47H2O, SnCl22H2O, ZnSO47H2O, KAl(SO4)2.12H2O, were used in the dyeing processes, according to pre- and simultaneous mordanting methods. After the dyeing processes, the dyed samples’ CIE L*a*b* and color efficiency K/S values were determined by spectrophotometry. The SEM and FTIR data of the fabrics were collected and evaluated at the end of the trials as well. At the same time, perspiration, rubbing, washing and light fastness values of the dyed materials were also assessed. Acceptable fastness test results were obtained for the dyed samples. The findings of the study indicated that the dyeability performance of wool and cotton fabrics with black carrot (Daucus carota L.) extract could be greatly influenced by the mordant used and its application method."
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Abu-Melha, Sraa. "Synthesis of novel biologically active thiazole dyes and their applications." Pigment & Resin Technology 48, no. 5 (September 2, 2019): 375–82. http://dx.doi.org/10.1108/prt-09-2018-0102.
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Purpose This study aims to focus on the possibility of developing new thiazole azo dyes with good colouristic application properties, biological and pharmacological activities. Design/methodology/approach Coupling of curcumin with different aromatic diazonium salts of 2-amino thiazole derivatives, such as 2-aminobenzothiazole, 2-amino-5-phenylthiazole, 2-amino-5-methylthiazole and 2-amino-5-nitrothiazole-produced novel azo dyes. Structures of all synthesised dyes were fully confirmed via spectroscopic and analytical methods. Those compounds were examined for their antimicrobial, anticancer and antioxidant activities. They were applied on polyester fabrics and, subsequently, their dyeing properties, light, washing, perspiration, rubbing and sublimation fastness were determined. Findings Prepared dyestuffs were suitable for dyeing polyester fabrics. It was found that all prepared dyes possess high colour strength, as well as good overall fastness properties. Meanwhile, the synthesised compounds exhibited good biological and pharmacology activity. Research limitations/implications Synthesis of these four azo dyes for textile dyeing was not conveyed earlier. Practical implications Thaizolyl disperse dyes were responsible for giving better colour assessment and fastness properties on polyester fabrics. Social implications Although, most of synthesis eco-friendly dyes are expensive, they are showing a good antimicrobial and anticancer activity. Originality/value It gave straightforward approach to synthesise novel thiazolyl azo dyes with good biological, pharmacology activities, good colour assessment, and fastness properties.
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Gaffer, Hatem E., and Ismail I. Althagafi. "Synthesis of new azobenzene dyes clubbed with thiazolidinone moiety and their applications." Pigment & Resin Technology 49, no. 3 (February 24, 2020): 207–14. http://dx.doi.org/10.1108/prt-02-2019-0022.
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Purpose The purpose of this paper is to synthesize some new azobenzene dyestuffs clubbed with thiazolidinone moiety and their solicitation in dyeing polyester fabrics representing their antibacterial evaluation. Design/methodology/approach Herein, the authors report the synthesis of new thiazolidinone moiety after the coupling of diazotized 4-aminoacetophenone with resorcinol. The newly synthesized dyes were characterized by IR, elemental analysis, mass spectroscopy and proton nuclear magnetic resonance (1H NMR) spectral studies. The characteristics of dyeing of these dyestuffs were evaluated at optimum conditions. Concurrent with dyeing of polyester fabric for synthesized dyes with their antibacterial activity was estimated. Antimicrobial activity of the dyed fabrics at different concentrations was evaluated against gram-positive and gram-negative bacteria. Findings Synthesized azobenzene dyestuffs clubbed with thiazolidinone dyes were applied on polyester fabrics. It was remarked that the modified dyes exhibited better colourfastness properties. Furthermore, the synthesized dyes revealed antimicrobial activity against gram-positive and gram-negative bacteria. Research limitations/implications The synthesized azobenzene dyes for polyester dyeing were not bore earlier. Practical implications The azobenzene dyes were accountable for giving improved colourfastness properties on polyester fabrics. Social implications The synthesized azobenzene derivatives are sensibly expensive and applicable dyes accompanied with good antimicrobial and anticancer activities. Originality/value A common process could be affording textiles of colour and antibacterial assets. The newly synthesized dyes containing thiazolidinone moieties with azobenzene coupler showed interesting disperse colourant for polyester with good antibacterial activity.
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Zahraa, O., S. Maire, F. Evenou, C. Hachem, M. N. Pons, A. Alinsafi, and M. Bouchy. "Treatment of wastewater dyeing agent by photocatalytic process in solar reactor." International Journal of Photoenergy 2006 (2006): 1–9. http://dx.doi.org/10.1155/ijp/2006/46961.
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The photocatalytic decolorization of industrial textile dyes has been studied. The treatment was carried out on a solar reactor consisting in a flat active plane, tilted so as to face the sun and to allow the trickling of the water to be treated. Alternatively the reactor could be irradiated by an artificial source. After checking the system using salicylic acid, a conventional model molecule, the photocatalytic decolorization of Orange II, Yellow Drimarene, and Black Drimarene dyes was investigated. Artificial and solar irradiation gave comparable results although the heating by the sun reduced the amount of adsorption. The kinetics agrees with the Langmuir-Hinshelwood model and a discrepancy between adsorption constants deduced from the kinetic and adsorption experiments was interpreted by considering various types of adsorption sites. Orange II and Drimarene dyes decolorization kinetics are opposite limiting cases of the above model, as being of order 0 and 1 with respect to the dye, respectively.
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Kodric, Marija, and Dragan Djordjevic. "Modification of Polyester Textiles for Easier Dyeing with Disperse Dyes." AATCC Journal of Research 7, no. 5 (September 1, 2020): 9–16. http://dx.doi.org/10.14504/ajr.7.5.2.
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Modification of polyester fibers for more economical dyeing at lower temperatures without a carrier are considered in this study. Polyester dyeing is carried out industrially under rigorous conditions at high temperatures and under increased air pressure, and are treated with various solvents (primary alcohols) to make the fibers more permeable. As a result, the sorption properties, as well as the disperse dye dyeing ability, are improved. Dyeing of a modified polyester fabric at lower temperatures yielded better results than the standard dyeing of the unmodified polyester under the same conditions. The effects of fiber modification were analyzed through water absorption properties, wetting, swelling, differential scanning calorimetry (DSC), and Fourier transform infrared (FTIR) methods, and the degree of dyeing of the fabric was evaluated using CIELab parameters.
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Hussain, Nadir, Sadam Hussain, Mujahid Mehdi, Muzamil Khatri, Sana Ullah, Zeeshan Khatri, Lieva Van Langenhove, and Ick Soo Kim. "Introducing Deep Eutectic Solvents as a Water-Free Dyeing Medium for Poly (1,4-cYclohexane Dimethylene Isosorbide Terephthalate) PICT Nanofibers." Polymers 13, no. 16 (August 5, 2021): 2594. http://dx.doi.org/10.3390/polym13162594.
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Water, one of the most priceless sources of life, is becoming dangerously threatened and contaminated due to population growth, industrial development, and climatic variations. The drainage of industrial, farming, and municipal sewage into drinking water sources pollutes the water. The textile processing industry is one of the major consumers of water. Herein, the idea of water-free dyeing of electrospun poly (1, 4-cyclohexane dimethylene isosorbide terephthalate) PICT nanofibers is proposed. For this, two different deep eutectic solvents (DE solvents) were introduced as an alternative to water for the dyeing of PICT nanofibers in order to develop a water-free dyeing medium. For this, C.I. disperse red 167 was used as a model dye to improve the aesthetic properties of PICT nanofibers. PICT nanofibers were dyed by conventional batch dyeing and ultrasonic dyeing methods to investigate the effect of the dyeing technique on color buildup characteristics. Dyeing conditions such as dyeing time, temperature and, dye-concentration were optimized. Morphological and chemical characterization observations revealed a smooth morphology of dyed and undyed PICT nanofibers. The ultrasonically dyed nanofibers showed higher color strength and increased tensile strength compared to conventionally dyed nanofibers. Further, the consumption of electrical and thermal energy was also calculated for both processes. The results confirmed that the ultrasonic dyeing method can save 58% on electrical energy and 25% on thermal energy as compared to conventional dyeing.
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Polak, Jolanta, Kamila Wlizło, Rebecca Pogni, Elena Petricci, Marcin Grąz, Katarzyna Szałapata, Monika Osińska-Jaroszuk, Justyna Kapral-Piotrowska, Bożena Pawlikowska-Pawlęga, and Anna Jarosz-Wilkołazka. "Structure and Bioactive Properties of Novel Textile Dyes Synthesised by Fungal Laccase." International Journal of Molecular Sciences 21, no. 6 (March 17, 2020): 2052. http://dx.doi.org/10.3390/ijms21062052.
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Novel sustainable processes involving oxidative enzymatic catalysts are considered as an alternative for classical organic chemistry. The unique physicochemical and bioactive properties of novel bio-products can be obtained using fungal laccase as catalyst. Among them are textile biodyes synthesised during oxidation of substrates belonging to the amine and methoxy organic derivatives. The process of synthesis occurs in mild conditions of pH, temperature, and pressure, and without using harmful oxidants. The effect of fungal laccase activity on the substrates mixture transformation efficiency was analysed in terms of antimicrobial dye synthesis on a large scale. Three new phenazine dyes, obtained in the presence of laccase from Cerrena unicolor, were studied for their structure and properties. The phenazine core structure of the products was a result of tri-molecular transformation of aminomethoxybenzoic acid and aminonaphthalene sulfonic acid isomers. One of the compounds from the synthesised dye, namely 10-((2-carboxy-6-methoxyphenyl)amino)-11-methoxybenzo[a]phenazine-8-carboxylic acid, was able to inhibit the growth of Staphylococcus aureus. The high concentration of substrates (5 g/L) was efficiently transformed during 72 h in the mild conditions of pH 4 with the use of laccase with an activity of 200 U per g of the substrates mixture. The new bioactive dye exhibited excellent dyeing properties with concomitant antibacterial and antioxidative activity. The proposed enzyme-mediated synthesis represents an alternative eco-friendly route for the synthesis of novel antimicrobial compounds with high importance for the medical textile industry.
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Gaffer, Hatem, Mounir Salem, and Magda Marzouk. "Synthesis of 4-hydroxy coumarin dyes and their applications." Pigment & Resin Technology 45, no. 5 (September 5, 2016): 320–29. http://dx.doi.org/10.1108/prt-09-2014-0071.
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Purpose The present study aims to focus on the possibility of developing new eco-friendly azo dyes with good colouristic application properties, exhibiting biological and pharmacological activities. Design/methodology/approach Coupling of 4-hydroxycoumarin with a variety of aromatic diazonium salts of 2-aminothiazole, 2-aminobenzothiazole, 4-aminoantipyrine, 4-aminoacetophenone, adenine sulphate, a-naphthylamine and sulphadimidine to produce novel azo dyes. The compounds were fully characterised using spectroscopic and analytical methods. All of the compounds were tested for their antimicrobial, anticancer and antioxidant activities. The prepared dyestuffs were dyed on polyester fabrics and subsequently their dyeing properties, light, washing, perspiration, rubbing and sublimation fastness were determined. Findings The spectroscopic data of the synthesised compounds have provided decisive evidence that such compounds exist in the solid state as the azo-dike to form C and in solution in equilibrium tautomer forms A, B and D. The prepared dyestuffs are suitable for either heat transfer printing or traditional printing on polyester and nylon 6 fabrics. The prints obtained from the dyes possess high colour strength, as well as good overall fastness properties. Also the synthesised compounds exhibit good biological and pharmacology activity. Research limitations/implications Synthesis of these seven azo dyes for textile dyeing had never been reported previously. Practical implications The dyestuffs derived from 4-hydroxycoumarin are reasonable azo disperse dyestuffs giving good all round fastness properties on polyester fabrics. Social implications Production of less expensive and new eco-friendly dyes exhibit antimicrobial and anticancer activity. Originality/value It provided a potentially simple way to synthesize novel coumarin azo-dyes exhibit good biological and pharmacology activity and also exhibit good overall fastness properties.
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Wawrzkiewicz, Monika, Beata Podkościelna, and Przemysław Podkościelny. "Application of Functionalized DVB-co-GMA Polymeric Microspheres in the Enhanced Sorption Process of Hazardous Dyes from Dyeing Baths." Molecules 25, no. 22 (November 11, 2020): 5247. http://dx.doi.org/10.3390/molecules25225247.
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Intensive development of many industries, including textile, paper, plastic or food, generate huge amounts of wastewaters containing not only toxic dyes but also harmful auxiliaries such as salts, acid, bases, surfactants, oxidants, heavy metal ions. The search for effective pollutant adsorbents is a huge challenge for scientists. Synthesis of divinylbenzene copolymer with glycidyl methacrylate functionalized with triethylenetetramine (DVB-co-GMA-TETA) resin was performed and the obtained microspheres were evaluated as a potential adsorbent for acid dye removal from dyeing effluents. The sorption capacities were equal to 142.4 mg/g for C.I. Acid Green 16 (AG16), 172 mg/g for C.I. Acid Violet 1 (AV1) and 216.3 mg/g for C.I. Acid Red 18 (AR18). Non-linear fitting of the Freundlich isotherm to experimental data was confirmed rather than the Langmuir, Temkin and Dubinin-Radushkevich. The kinetic studies revealed that intraparticle diffusion is the rate-limiting step during dye adsorption. Auxiliaries such as Na2SO4 (5–25 g/L), CH3COOH (0.25–1.5 g/L) and anionic surfactant (0.1–0.5 g/L) present in the dyeing baths enhance the dye adsorption by the resin in most cases. Regeneration of DVB-co-GMA-TETA is possible using 1 M NaCl-50% v/v CH3OH.
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Perng, Yuan, and Manh Bui. "The feasibility of Cassia fistula gum with polyaluminium chloride for the decolorization of reactive dyeing wastewater." Journal of the Serbian Chemical Society 80, no. 1 (2015): 115–25. http://dx.doi.org/10.2298/jsc140102041p.
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In order to find a new environmental-friendly coagulant that can partially replace conventional polyaluminium chloride (PAC) which was shown to be toxic to aquatic environment, gum extracted from seeds of Cassia fistula Linn. (CF) was investigated in decolorization of reactive dyes Blue 19 (RB19) and Black 5 (RB5) using jar-test experiments. The optimal results showed that crude CF gum (at pH 10, initial dye concentrations (IDC) of 100 and 50 mg L-1, gum dosages 200 and 300 mg L-1, reaction time 30 and 45 min, and agitation speed 60 rpm) did not achieve high degrees of decolorization in RB5 and RB19 (55.7 and 62.0 %, respectively) as compared with PAC coagulant (97.2 and 94.4 %, respectively) at the same IDC and reaction time. Whereas when CF gum was used in combination with PAC, decolorization efficiencies of both dyes reached over 92 % at 40 % volume fraction of gum. These results indicated the potential of using CF gum as a ?green? coagulant or as a contributing factor to color removal of textile wastewater.
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Dulman, Viorica, Lucia Odochian, Mihai Dumitras, and Cucu Man. "A study by non-isothermal thermal methods of spruce wood bark materials after their application for dye removal." Journal of the Serbian Chemical Society 70, no. 11 (2005): 1325–33. http://dx.doi.org/10.2298/jsc0511325d.
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This paper deals with a study of some materials obtained from spruce bark (Picea abies, Romania), after retention of some dyes frequently used in dyeing processes in the textile industry and waste water treatment. These materials obtained by dye retention exhibit a particular thermal behavior which is different from that of the blank sample (spruce bark). The characteristic temperatures, weight losses, the residue remaining after thermo-oxidative degradation, as well as the activation energies of the significant thermo-destruction stages, estimated from non-isothermal thermogravimetric data, together with the thermal quantities calculated from DTA data support the conclusion presented in a previous study on dye retention from aqueous solution. The obtained results made evident that, under optimal retention conditions, spruce bark shows the highest retention capacity for the Basic Blue dye, followed by Direct Brown 95 and Direct Brown 2.
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Aly, Amal A., Safia A. Mahmoud, and Morsy Ahmed El-Apasery. "Decolorization of reactive dyes, Part I: eco-friendly approach of reactive dye effluents decolorization using cationized sugarcane bagasse." Pigment & Resin Technology 47, no. 2 (March 5, 2018): 108–15. http://dx.doi.org/10.1108/prt-10-2016-0092.
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Purpose This paper aims to decolorize the effluents of textile Reactive Orange 5 and Reactive Red 195 dyes by using cationized sugarcane bagasse. Design/methodology/approach Cationized sugarcane bagasse was prepared and used as an adsorbent for both reactive and hydrolyzed reactive dyes. Characterization of the sugarcane bagasse structure resulted by cationization was monitored using Fourier transform–infrared, while morphologically was detected using scanning electron microscopy and X-ray powder diffraction. Findings The maximum adsorption capacities are 805, 1,664, 1,772 and 1,596 mg/g for Hydrolyzed Red 195, Hydrolyzed Orange 5, Reactive Red 195 and Reactive Orange 5 dyes, respectively. Research limitations/implications Factors affecting the percentage of dye removal were optimized on different parameters such as adsorbent dose and treatment time. The data were discussed using the Langmuir and Freundlich Models of adsorption. Practical implications The reuse of hydrolyzed reactive dyebaths gives reasonably good fastness properties on nylon fabrics. Social implications The study has enabled the production of an eco-friendly and less expensive method of reactive dye effluent decolorization. Originality/value The study provides a potentially simple approach to decolorize dye effluents of Reactive Orange 5, Red 195 dyes and also the reuse of hydrolyzed reactive dyebaths for dyeing nylon.
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Swami, C., S. Saini, and V. B. Gupta. "Kinetic and diffusion studies of a dye extracted from Sesbania aculeata plant." Pigment & Resin Technology 43, no. 3 (April 29, 2014): 118–26. http://dx.doi.org/10.1108/prt-06-2012-0041.
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Purpose – The purpose of this paper is to evaluate the efficacy and kinetics along with diffusion properties of a new source of natural dye obtained from leaves and fine stems of the Sesbania aculeata plant, using metallic mordants for cotton dyeing. Design/methodology/approach – The approach followed in this work is to conduct experiments with the application of the natural dye obtained from Sesbania aculeata plant and to study the kinetics, dye uptake and the diffusion properties of this dye. Findings – Sesbania aculeata with simultaneous mordanting with different metal mordants imparted shades which varied from cream to light brown to dark brown in case of aqueous extract. The different mordants used not only changed the hue colour and K/S values but also L* and brightness index values. The results of fastness properties of the dyes were found to vary from fair to good. The percentage dye exhaustion values varied with different mordants. The dye uptake value increased with time and reached its saturation limit after 4 hours of dyeing. In the absence of mordants, the diffusion coefficient values increased with increase in the temperature. In the presence of mordants, the diffusion process appears to slow down, which could be attributed to the binding effects of mordants. Research limitations/implications – The extraction and dyeing process of Sesbania aculeata plant is less tedious and time consuming compared to the other sources of natural dyes. Practical implications – Sesbania aculeata is relatively easier to grow and does not require much tending operations. Thus, it promises to be an affordable source of natural dye. If this dye is commercialised, it will help to generate sustainable employment and income for the farmers in rural and sub-urban areas. This could be both for dyeing and for non-food crop farming. Originality/value – An advantageous feature of this plant, in contrast to the other natural dyes based on vegetable and fruit sources, is that its usage in making the natural dye does not result in any wastage of an otherwise highly commercial product. The current experimental study on a new source of natural dye would be a significant contribution to the existing database of knowledge regarding the kinetics and diffusion properties of natural dyes. There are several reported studies in the literature pertaining to the application of natural colourants and evaluation of their dyeing properties on various fibers. However, relatively fewer studies exist on the kinetic and exhaustion aspects. Thus, the current study would help to develop a set of predictable settings for application of natural dyes on various textiles.
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Hu, Shang, and Chiu. "Removal of Reactive Dyes in Textile Effluents by Catalytic Ozonation Pursuing on-Site Effluent Recycling." Molecules 24, no. 15 (July 29, 2019): 2755. http://dx.doi.org/10.3390/molecules24152755.
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The textile wash-off process consumes substantial amounts of water, which generates large volumes of wastewater that pose potential pollution issues for the environment. In the present study, catalytic ozonation was applied to degrade residual dyes present in rinsing effluents from wash-off processes towards the aim of recycling the waste effluents. A magnetic catalyst was prepared for promoting dye degradation by catalytic ozonation. Via a hydrothermal reaction, highly magnetic manganese ferrite (MnFe2O4) particles were successfully loaded on carbon aerogel (CA) materials (MnFe2O4@CA). The results showed that the developed catalyst strikingly promoted the degradation of dye contaminants by catalytic ozonation, in terms of color removal and reduction of chemical oxidation demand (COD) in rinsing effluents. COD removal efficiency in catalytic ozonation was enhanced by 25% when compared with that achieved by ozonation alone under the same treatment conditions. Moreover, we confirmed that after catalytic ozonation, the rinsing effluents could be recycled to replace fresh water without any evident compromise in the color quality of fabrics. The color difference (ΔEcmc(2:1)) between fabrics treated with recycled effluents and water was not more than 1.0, suggesting that the fabrics treated with recycled effluents displayed acceptable color reproducibility. Although colorfastness and color evenness of fabrics treated with recycled effluents were slightly poorer than those of fabrics treated with water, they were still within the acceptable tolerance. Therefore, the present study validated that catalytic ozonation was a promising technology for saving water and wastewater elimination in textile dyeing. It provides a feasibility assessment of catalytic ozonation for recycling waste effluents to reduce water dependence in textile production. Furthermore, we show a new perspective in on-site recycling waste effluents by catalytic ozonation and enrich the knowledge on feasible approaches for water management in textile production.
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Zimmermann, Marc, Benjamin Stomps, Christine Schulte-Osseili, Dmitry Grigoriev, Dirk Ewen, Andrew Morgan, and Alexander Böker. "Organic dye anchor peptide conjugates as an advanced coloring agent for polypropylene yarn." Textile Research Journal 91, no. 1-2 (June 17, 2020): 28–39. http://dx.doi.org/10.1177/0040517520932231.
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Polypropylene as one of the world's top commodity polymers is also widely used in the textile industry. However, its non-polar nature and partially crystalline structure significantly complicate the process of industrial coloring of polypropylene. Currently, textiles made of polypropylene or with a significant proportion of polypropylene are dyed under quite harsh conditions, including the use of high pressures and temperatures, which makes this process energy intensive. This research presents a three-step synthesis of coloring agents, capable of adhering onto synthetic polypropylene yarns without harsh energy-consuming conditions. This is possible by encapsulation of organic pigments using trimethoxyphenylsilane, introduction of surface double bonds via modification of the silica shell with trimethoxysilylpropylmethacrylate and final attachment of highly adhesive anchor peptides using thiol-ene chemistry. We demonstrate the applicability of this approach by dyeing polypropylene yarns in a simple process under ambient conditions after giving a step-by-step guide for the synthesis of these new dyeing agents. Finally, the successful dyeing of the yarns is visualized, and its practicability is discussed.
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Sharma, Shweta, Rakshit Ameta, R. K. Malkani, and Suresh C. Ameta. "Use of semi-conducting bismuth sulfide as a photocatalyst for degradation of rose bengal." Macedonian Journal of Chemistry and Chemical Engineering 30, no. 2 (December 5, 2011): 229. http://dx.doi.org/10.20450/mjcce.2011.37.
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Different methods have been adopted for the removal and degradation of dyes from effluents of textile, dyeing and printing industries. These methods have their own merits and drawbacks. In the present investigation, bismuth sulfide has been used as a photocatalyst for the degradation of rose Bengal. The effect of different parameters like the pH, concentration of dye solution, amount of semiconductor and light intensity on the rate of reaction has been investigated. The reaction follows pseudo-first order kinetics. The optimum conditions were obtained as: [rose Bengal] = 1.60·10–5 M; Bi2S3 = 0.10 g; pH = 8.5, and light intensity = 50.0 mW·cm–2. The rate constant was 4.68·10–5 sec–1. A mechanism has been proposed for the degradation of rose Bengal involving hydroxyl radicals.
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Calà, Elisa, Fabio Gosetti, Monica Gulmini, Ilaria Serafini, Alessandro Ciccola, Roberta Curini, Annalisa Salis, et al. "It’s Only a Part of the Story: Analytical Investigation of the Inks and Dyes Used in the Privilegium Maius." Molecules 24, no. 12 (June 12, 2019): 2197. http://dx.doi.org/10.3390/molecules24122197.
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The Privilegium maius is one of the most famous and spectacular forgeries in medieval Europe. It is a set of charters made in the 14th century upon commitment by Duke Rudolf IV, a member of the Habsburg family, to elevate the rank and the prestige of his family. These five charters, now kept at the Österreichisches Staatsarchiv in Vienna, have been subjected to a thorough interdisciplinary study in order to shed light on its controversial story. The charters are composed of pergamenaceous documents bound to wax seals with coloured textile threads. The present contribution concerns the characterisation of the inks used for writing and of the dyes used to colour to the threads: Are they compatible with the presumed age of the charters? Though showing only a part of the whole story of the charters, dyes analysis could contribute in assessing their complex history from manufacturing to nowadays. The dyes were characterised with non-invasive in situ measurements by means of fibre optic (FORS) and with micro-invasive measurements by means of Surface Enhanced Raman Spectroscopy (SERS) and High-Performance Liquid Chromatography with Mass Spectrometry (HPLC-MS) analysis. The results showed that the threads of four of the charters (three dyed with madder, one with orchil) were apparently coloured at different dyeing stages, then re-dyed in the 19–20th century.
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Azeem, Abdul, Sharjeel Abid, Noman Sarwar, Shahzaib Ali, Ahsan Maqsood, Rashid Masood, and Tanveer Hussain. "Optimization of the color fastness and mechanical properties of pigment dyed PC fabric." Pigment & Resin Technology 47, no. 5 (September 3, 2018): 396–405. http://dx.doi.org/10.1108/prt-12-2017-0109.
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Purpose The purpose of this study is to improve the mechanical properties and reduce the stiffness/harshness of fabric associated with the pigment dyeing of textiles. Design/methodology/approach The fabric was pigment dyed with the addition of three different softeners and binders. The fabric was then analyzed to have improved textile properties by measuring tear strength, bending length, crocking and washing fastness tests. Findings The conventional route of pigment dyeing (without any softener) imparted poor mechanical and rubbing fastness. The softener-added recipe provided better mechanical, rubbing and washing fastness, and the stiffness values were oppressed as well. Practical implications Because of reduced stiffness, increased fastness and mechanical properties, the use of softener with pigment dyeing can improve the market values and satisfaction of the dyed fabrics. The finished product would also have better life and endurance. The process can be modified easily to have a better end-product with a negligible cost addition in industrial process, as softeners are cheap and used in low (10-20 g/l) in industrial settings without affecting the required shades. Originality/value This is the first report, to the best of the author’s knowledge, on the optimization of pigment dyeing of PC fabric with the addition of Helizarin and perapret softeners in dyeing bath.
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Smelcerovic, Miodrag, Dragan Djordjevic, Mile Novakovic, and Mirjana Mizdrakovic. "Decolorization of a textile vat dye by adsorption on waste ash." Journal of the Serbian Chemical Society 75, no. 6 (2010): 855–72. http://dx.doi.org/10.2298/jsc090724057s.
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An adsorption process using cheap adsorbents could be described as a simple, selective and low cost alternative for the treatment of colored waste water compared to conventional physical and chemical processes. In this study the use of a natural waste adsorbent - ash was investigated for the removal of a textile vat dye Ostanthren Blue GCD remaining after the dyeing of cotton textile. The ash obtained as a waste material during the burning of brown coal in the heating station of Leskovac (Serbia) was used for the treatment of waste waters from the textile industry, i.e., waste water after the dyeing process. The effect of ash quantity, initial dye concentration, pH and agitation time on adsorption was studied. The Langmuir model was used to describe the adsorption isotherm. Based on the analytical expression of the Langmuir model, the adsorption constants, such as adsorption capacity and adsorption energy, were found. Pseudo first and second order kinetic models were studied to evaluate the kinetic data.
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Bezerra, Fabricio Maestá, Manuel José Lis, Helen Beraldo Firmino, Joyce Gabriella Dias da Silva, Rita de Cassia Siqueira Curto Valle, José Alexandre Borges Valle, Fabio Alexandre Pereira Scacchetti, and André Luiz Tessaro. "The Role of β-Cyclodextrin in the Textile Industry—Review." Molecules 25, no. 16 (August 9, 2020): 3624. http://dx.doi.org/10.3390/molecules25163624.
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β-Cyclodextrin (β-CD) is an oligosaccharide composed of seven units of D-(+)-glucopyranose joined by α-1,4 bonds, which is obtained from starch. Its singular trunk conical shape organization, with a well-defined cavity, provides an adequate environment for several types of molecules to be included. Complexation changes the properties of the guest molecules and can increase their stability and bioavailability, protecting against degradation, and reducing their volatility. Thanks to its versatility, biocompatibility, and biodegradability, β-CD is widespread in many research and industrial applications. In this review, we summarize the role of β-CD and its derivatives in the textile industry. First, we present some general physicochemical characteristics, followed by its application in the areas of dyeing, finishing, and wastewater treatment. The review covers the role of β-CD as an auxiliary agent in dyeing, and as a matrix for dye adsorption until chemical modifications are applied as a finishing agent. Finally, new perspectives about its use in textiles, such as in smart materials for microbial control, are presented.
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Gaffer, Hatem E., Mohamed R. Elgohary, Hassan Ali Etman, and Saad Shaaban. "Antibacterial evaluation of cotton fabrics by using novel sulfonamide reactive dyes." Pigment & Resin Technology 46, no. 3 (May 2, 2017): 210–17. http://dx.doi.org/10.1108/prt-08-2015-0080.
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Purpose The purpose of this paper was to synthesize novel antibacterial reactive dyes for dyeing cotton fabrics. Design/methodology/approach Four synthetic novel antibacterial reactive dyes based on sulfonamide (D1-D4) have been synthesized by the coupling reaction of sulfonamide diazonium salt with sulfonamido-cyanurated 7-amino-4-hydroxynaphthalene-2-sulfonic acid “j-acid”. The chemical structure of the synthesized dyes was secured by their spectral data [infra red (IR) and proton Nuclear magnetic Resonance (1HNMR)]. Findings The prepared reactive dyes (D1-D4) were applied to cotton fabrics. Optimum conditions of the dying samples at sodium sulfate 100 g/l, liquor ratio (L.R.) 1:10, sodium carbonate 20 g/l at 80°C (D1, D2 and D4), 60°C (D3 for 60 min) were investigated. The fastness properties toward washing, perspiration, rubbing and light were evaluated. Dyed fabrics showed good light fastness property and good to very good washing and perspiration fastness properties according to the gray scale. Antimicrobial activities for synthesized dyes showed excellent activity against gram-negative organisms such as Pseudomonas aeruginosa and Proteus mirabilis faecalis, whereas very good activity against gram-positive organisms such as Staphylococcus aureus and Enterococcus faecalis with respect to the standard drugs ampicillin and chloramphenicol. Originality/value The principle advantages in this study were that the synthesis of novel synthesized dyes by introducing bisulfonamide-based moieties to increase the antimicrobial activity of the cellulose fabrics could be used as a medical textile, short reaction time and reaction procedure conducted in few steps, the work up is convenient and thus the starting material can be easily prepared.
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Liu, Shuai, Xiaofeng Fang, Mengmeng Lou, Yihan Qi, Ruo Li, Gang Chen, Yonglian Li, Yanbiao Liu, and Fang Li. "Construction of Loose Positively Charged NF Membrane by Layer-by-Layer Grafting of Polyphenol and Polyethyleneimine on the PES/Fe Substrate for Dye/Salt Separation." Membranes 11, no. 9 (September 13, 2021): 699. http://dx.doi.org/10.3390/membranes11090699.
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The effective separation of dyes and inorganic salts is highly desirable for recycling inorganic salts and water resource in printing and dyeing wastewater treatment. In this work, tannic acid (TA) and polyethyleneimine (PEI) were grafted on the PES/Fe ultrafiltration membrane via the coordination assembly and Michael addition strategy to fabricated a loose nanofiltration membrane (LNM). The effect of PEI concentration on membrane morphologies and properties was systematically investigated. The membrane surface becomes more hydrophilic and transforms into positive charge after the PEI grafting. The optimized PES/Fe-TA-PEI membrane possesses high pure water flux (124.6 L·m−2·h−1) and excellent dye rejections (98.5%, 99.8%, 98.4%, and 86.4% for Congo red, Eriochrome black T, Alcian blue 8GX, and Bromophenol blue, respectively) under 2 bar operation pressure. Meanwhile, the LNM showed a high Alcian blue 8GX rejection (>98.4%) and low NaCl rejection (<5.3%) for the dye/salt mixed solutions separation. Moreover, the PES/Fe-TA-PEI LNM exhibited good antifouling performance and long-term performance stability. These results reveal that such LNM shows great potential for effective fractionation of dyes and salts and recycling of textile wastewater.
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Adam, Abdel Majid A., Hosam A. Saad, Ahmed A. Atta, Mohammed Alsawat, Mohamed S. Hegab, Moamen S. Refat, Tariq A. Altalhi, Eid H. Alosaimi, and Ayman A. O. Younes. "Preparation and Characterization of New CrFeO3-Carbon Composite Using Environmentally Friendly Methods to Remove Organic Dye Pollutants from Aqueous Solutions." Crystals 11, no. 8 (August 16, 2021): 960. http://dx.doi.org/10.3390/cryst11080960.
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Globally, environmental pollution is an important issue. Various pollutants present in water resources, such as bacteria, heavy-metal ions, and organic pollutants, cause serious problems to the environment, animals, plants, and human health. Among the water resources, pollutants, dyestuff, which is discharged from dyeing, textile, and other industrial processes, is an important class of pollutants. Removing these dye pollutants from water resources and wastewater is vital and important due to their toxicity. In this work, a CrFeO3-carbon nanotube (CNT) adsorbent was synthesized using environmentally friendly methods. The synthesized CrFeO3-CNT adsorbent was characterized stoichiometrically, spectroscopically, and morphologically. The synthesized CrFeO3-CNT adsorbent was tested for the removal of two dyes: Methyl violet 2B (MV) and Azocarmine G2 (AC) from an aqueous solution. Crushing CrFeO3 composite with multi-walled fullerene CNT to prepare CrFeO3-CNT adsorbent improved the adsorption performance of free multi-walled fullerene CNT towards MV dye by 30% and towards AC dye by 33.3%.
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Sheikh, Javed, Ashutosh Agrawal, Harsh Garg, Aashi Agarwal, and Prasun Mathur. "Functionalization of Wool Fabric Using Pineapple Peel Extract (PPE) as a Natural Dye." AATCC Journal of Research 6, no. 5 (September 1, 2019): 16–20. http://dx.doi.org/10.14504/ajr.6.5.3.
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Large quantities of pineapple peel waste are discarded every year that can be used for extraction of useful textile functionalization chemicals. In the present work, pineapple peel extract (PPE) was used for simultaneous dyeing and multifunctional finishing of wool fabric. The PPE was used for dyeing wool fabrics, with and without mordants. The dyed fabrics were characterized and evaluated for color values and fastness properties. The functional properties of the dyed fabrics viz. antibacterial activity, UV protection, and antioxidant activity were evaluated. It was confirmed that wool fabric can be dyed using pineapple peel extract without mordants; however, additional color strength can be gained using pre-mordanting. The dyed fabrics showed light shades with good fastness properties along with excellent functional properties.
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Cibulic, Violeta, Lidija Stamenkovic, Nebojsa Veljkovic, and Novica Staletovic. "Dynamics of the process of colour adsorption from waste waters after dyeing textile fibres on natural zeolites." Chemical Industry 67, no. 1 (2013): 41–49. http://dx.doi.org/10.2298/hemind120209049c.
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This study analyses the process of purifying waste waters from textile fibre dyeing by adsorption of colour on natural zeolites from ?Nemetali? mine, Vranjska Banja, Serbia. The process has been analyzed in an adsorption column filled with natural zeolite as the adsorbent. Adsorbents are organic substances, i.e. colour residues from waste waters, left after textile fibres dyeing. The concentration change in waste waters is represented with the parameter of chemical oxygen demand (COD). Two models of diffusion have been considered: diffusion in pores and diffusion in adsorbent phase on solid adsorbent, for different input loads and two zeolite granulations (13 and 35 mm). It was found that the diffusion in zeolite pores that were in adsorbed phase is dominant in this case, which can be explained by large dimensions of used colours? molecules. This is the reason why its adsorption in zeolite micro pores is minimal, and yet it diffuse well in already adsorbed phase on solid adsorbents. Since this process is slower, it will determine the overall rate of colour adsorption from waste waters. Specific equilibrium capacity, specific dynamic capacity, as well as the level of adsorbent utilization were determined by the use of mass transfer zone concept. It has been shown that the adsorption of organic substances from waste waters is satisfactory, and is around 80%. The highest degree of adsorbent utilization is obtained at the lowest flow of 0.167 cm3 s-1, while the lowest degree of utilization of 30%, is obtained at the highest flow of 3.27 cm3 s-1. Input load has significant influence on the degree of column utilization, while higher values of COD0 result in lower degrees of column utilization. Key words: waste waters, natural zeolite, adsorption, colour adsorption, textile dyes
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Haji, Aminoddin, and Pedram Payvandy. "Application of ANN and ANFIS in prediction of color strength of plasma-treated wool yarns dyed with a natural colorant." Pigment & Resin Technology 49, no. 3 (January 8, 2020): 171–80. http://dx.doi.org/10.1108/prt-10-2019-0089.
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Purpose Despite the increasing popularity of natural dyeing of textiles, the low substantivity between the fibers and the natural dyes is a problem. Several methods have been used to overcome this problem. In this study, wool fibers were pretreated with oxygen plasma under different conditions and dyed with the extract of grape leaves. The purpose of this study is to investigate the effects of plasma treatment parameters on the color strength of the dyed samples using artificial neural network (ANN) and adaptive neuro-fuzzy inference system (ANFIS) and evaluate the ability of these methods for predicting the color strength. Design/methodology/approach Woolen yarns were modified under different conditions of oxygen plasma treatment. Oxygen flow rate, power and time were considered as the treatment variable factors. Plasma-treated samples were dyed under constant conditions with the extract of grape leaves as a natural dye. ANN and ANFIS were applied to model and analyze the effect of plasma treatment parameters on the color strength of the dyed samples. Findings The results showed that increasing all the plasma treatment process variables, including oxygen flow rate, power and time increased the color strength of the dyed samples. The results showed that the developed ANN and ANFIS could accurately predict the experimental data with correlation coefficients of 0.986 and 0.997, respectively. According to the obtained correlation coefficients, ANFIS had a higher accuracy in prediction of the results of this study compared with the ANN and RSM models (correlation coefficient = 0.902, from our previous study). Originality/value This study uses ANN and ANFIS for predicting color strength of naturally dyed textiles for the first time. The use of computational intelligence for the optimization and prediction of the effects plasma treatment for the improvement of natural dyeing of wool is another novelty of this study.
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Zeng, Qian, Yu Wang, Feixiang Zan, Samir Kumar Khanal, and Tianwei Hao. "Biogenic sulfide for azo dye decolorization from textile dyeing wastewater." Chemosphere 283 (November 2021): 131158. http://dx.doi.org/10.1016/j.chemosphere.2021.131158.
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Yılmaz, Fazlıhan, and Muhammed İBrahim Bahtiyari. "Use of Tea and Tobacco Industrial Wastes in Dyeing and Antibacterial Finishing of Cotton Fabrics." AATCC Journal of Research 7, no. 5 (September 1, 2020): 25–31. http://dx.doi.org/10.14504/ajr.7.5.4.
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Textile finishing processes cover a variety of steps in which various chemicals and methods can be used to functionalize the fabrics. The objective of this study is to investigate the usability of tea and tobacco industrial waste as natural dye sources and antibacterial agents for cotton fabrics. These wastes were collected from the related mills and used directly without previous extraction, as well as in extracted form. Dyeings were conducted at two different temperatures and the dyed samples were analyzed in terms of obtained colors, fastness values, and antibacterial efficiencies. Useful coloration of the cotton fabrics with sufficient fastness values was achieved, with bacterial reductions dependent upon treatment conditions. In general, waste from tea processing yielded better results.
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Khalfaoui, M., M. H. V. Baouab, R. Gauthier, and A. Ben Lamine. "Dye Adsorption by Modified Cotton. Steric and Energetic Interpretations of Model Parameter Behaviours." Adsorption Science & Technology 20, no. 1 (February 2002): 33–47. http://dx.doi.org/10.1260/026361702760120917.
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The variations of the three parameters, viz. anchorage number, receptor site density and half-saturation concentration, as determined theoretically (Khalfaoui et al. 2002) and related to the adsorption energy, exhibited different behaviours when examined in terms of the adsorption of various dyes on to modified cotton. When plotted against the percentage nitrogen content of these cottons, variations in the effective receptor site density and the inverse of the adsorbed molecules anchorage number allowed the adsorption process to be described topographically in terms of the parallel or perpendicular adsorption of the dye molecule on to the adsorbent surface. The presence of ionic or van der Waals forces in such adsorption was also considered. The values of the model parameters were found to be related to the magnitude of the steric hindrance arising from the anchorage geometry of the dye molecule. Where the site density was high, a form of dimerization of the dye molecules was favoured. The best conditions for obtaining a high adsorption capacity, necessary for textile dyeing and wastewater depollution, were considered. Through the use of the half-saturation capacity, c1/2, it was possible to determine the change in the adsorption energy when the receptor site spacing was decreased and to relate such variation to the rate of steric hindrance, τ.
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Bechtold, Thomas, Amalid Mahmud-Ali, and Rita A. M. Mussak. "Reuse of ash-tree (Fraxinus excelsior L.) bark as natural dyes for textile dyeing: process conditions and process stability." Coloration Technology 123, no. 4 (August 2007): 271–79. http://dx.doi.org/10.1111/j.1478-4408.2007.00095.x.
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