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Academic literature on the topic 'Green Dyes'

Author: Grafiati

Published: 10 March 2023

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Journal articles on the topic "Green Dyes"

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Wiriya-Amornchai, Atiwat, Nattakarn Hongsriphan, and Pajeara Pattanatabutr. "Natural Dyeing of Wood Fibers for Green Biocomposites." Advanced Materials Research 488-489 (March 2012): 511–14. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.511.

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In this study, the mechanical and thermal properties of green biocomposites adding natural dye were investigated by tensile test and Differential Scanning Calorimetry (DSC). Poly(lactic acid), one of biodegradable polymers recently been interested for replacing petroleum-based polymers, was compounded with wood fibers to produce biocomposite, and natural dyes were introduced to improve appearance of biocomposite. Pine wood fibers were dyed with three types of natural dyes; yellow color from heartwood of Jackfruit tree, red color from Sappan wood, and blue color from Indigo blue. Prior compounding, original and dyed wood fibers were treated with silane to improve compatibility between wood fiber and polymer matrix. It is found that %crystallinity of alkali-treated and natural dyed wood/PLA biocomposites were significantly higher than original wood/PLA biocomposites. The modulus and tensile strength of natural dyed wood poly (lactic acid) composites were in the same level of alkali-treated wood composites; however, elongation at break was improved by natural dye.

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Hobson, Debra K., and David S. Wales. "‘Green’ dyes." Journal of the Society of Dyers and Colourists 114, no. 2 (October 22, 2008): 42–44. http://dx.doi.org/10.1111/j.1478-4408.1998.tb01944.x.

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Maghfiroh, Maghfiroh, Mutadin Mutadin, and Sri Puji Astuti. "ANALISIS KUALITAS DAN KETAHANAN LUNTUR WARNA BATIK HASIL PROSES REUSE SISA LARUTAN CELUP ZAT WARNA SINTETIS GOLONGAN BEJANA MENUJU GREEN INDUSTRY." Pena Jurnal Ilmu Pengetahuan dan Teknologi 34, no. 1 (April 1, 2020): 24. http://dx.doi.org/10.31941/jurnalpena.v34i1.996.

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<p>It has been found the fact that natural dyes are not environmentally friendly dyes if they are directly discharged into the water without undergoing processing. Theoretically, both synthetic dyes and natural dyes have the same opportunity to cause pollution of aquatic ecosystems because they have the same functional groups. So far, natural dyes are considered environmentally friendly not because of the low waste pollutant parameters, but because there is a process of reuse of the remaining dyed water. The process of reusing the remaining dye solution can reduce the volume of liquid waste discharged into the water. This study aims to reuse of the remaining water dyed synthetic of vat dyes for the process of making batik. The quality of the staining results is evaluated by color fastness test on washing and rubbing. The reusing synthetic of vat dyes group is done for coloring cotton fabrics. The fabric color evaluation stage is carried out to test the color intensity and fastness of synthetic dyes of vat dyes group if the dye is reused in the batik process. Color intensity test was carried out by UV-PC spectrophotometer, color fastness test on washing use gray scale, and color fastness test on dry rubbing use staining scale. Based on the color intensity test, the process of reusing the remaining dye solution of the indantren navy blue R is still optimal if used on the same day. Reusing the remaining dye solution the next day gives a large value of color intensity value from the use of the dye solution for the first time. Indantren navy blue R color substances are relatively resistant to hydrolysis reactions during the dissolution process in water.</p>

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Mesrar, F. E., H. Tachallait, O. Cherkaoui, K. Bougrin, and R. Benhida. "Green and sustainable dyeing of wool with madder plant of the Moroccan flora." IOP Conference Series: Materials Science and Engineering 1266, no. 1 (January 1, 2023): 012015. http://dx.doi.org/10.1088/1757-899x/1266/1/012015.

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Abstract Textile industry is evolving towards limiting the use of synthetic dyes due to their environmental and health concerns. Natural dyes are considered the ultimate alternative as it is green and ecofriendly. However, natural dyeing is limited by the use of metal mordants to enhance the colorimetric and fastness behavior of dyed textiles. In this work, madder roots (Rubia Tinctorum) from Morocco were analyzed by mean of HPLC-PDA and used to dye wool yarns. The effect of pre-mordanting with different metal mordants was assessed. Color properties, exhaustion, and fixation rates of dyed wool was also evaluated depending on the mordants.

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Idan, Intidhar J., Luqman C. Abdullah, Thomas SY Choong, and Siti Nurul Ain B. Md Jamil. "Equilibrium, kinetics and thermodynamic adsorption studies of acid dyes on adsorbent developed from kenaf core fiber." Adsorption Science & Technology 36, no. 1-2 (June 30, 2017): 694–712. http://dx.doi.org/10.1177/0263617417715532.

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Quaternized kenaf core fiber (QKCF) was used as an adsorbent for adsorption of anionic Acid Blue-25 (AB) and anionic Acid Green-25 (AG) dyes. Chemical treatment with (3-chloro-2-hydroxypropyl) trimethylammonium chloride under basic condition was applied in order to alter the surface properties of the raw kenaf core fiber. Adsorption studies were carried out to delineate the effect of initial dye concentration, temperature and pH on removal of dyes. The results show that the percentage removal of Acid Blue-25 and Acid Green-25 dyes were increased by increasing the concentrations of dyes. In addition, the maximum percentage removal was 99.8% and 99.65% for Acid Blue-25 and Acid Green-25, respectively. Langmuir, Freundlich and Temkin isotherm models were applied to analyze the data for dye adsorption at 15℃, 25℃, 35℃, and 45℃. The experimental data were best represented by the Langmuir model with maximum adsorption capacity of 303.03 mg/g and 344.83 mg/g for Acid Blue-25 and Acid Green-25 dyes, respectively, at 15℃, and the kinetic data for both dyes were best represented by the pseudo-second-order kinetic model. Thermodynamic studies indicated that the reactions of Acid Blue-25 and Acid Green-25 dyes were endothermic. It was concluded that QKCF adsorbent can be utilized as an efficient low-cost adsorbent for removal of anionic dyes.

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J. Jalil, A., S. Mahmood, A. H. Abdul Rashid, S. H. Nasir, S. A. Ibrahim, and M. R. Ahmad. "Extraction of Eco-Friendly Natural Dyes from Pina Leaves and their Application on Wool Fabrics." International Journal of Engineering & Technology 7, no. 4.14 (December 24, 2019): 382. http://dx.doi.org/10.14419/ijet.v7i4.14.27689.

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Natural dyes comprise of colorants that are obtained from animals or vegetable matters without any chemical processing. Natural dyes can substitute synthetic dye and promotes green technology initiatives in the field of textile dyeing. This study was carried out by extracting dyes from pineapple leaves (Ananas Comosus) using three stage mordanting methods using different mordants namely pre-mordanting, post-mordanting and simultaneous dyeing-mordanting. The mordants used were aluminium potassium sulphate, white vinegar and sodium chloride (NaCl). Wool fabrics were used for dyeing. The strength of colour and K/S values of the dyed fabrics were measured before and after washing. The colourfastness to washing, rubbing and light fastness of the fabrics were conducted to investigate the performance of the dye and mordants. The results indicate that the washing, rubbing and light fastness properties of dyed samples were between good to excellent grades.

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Akter, Humayra, Phillip W. Taylor, and Peter Crisp. "Visibility and Persistence of Fluorescent Dyes, and Impacts on Emergence, Quality, and Survival of Sterile Queensland Fruit Fly Bactrocera tryoni (Diptera: Tephritidae)." Journal of Economic Entomology 113, no. 6 (October 27, 2020): 2800–2807. http://dx.doi.org/10.1093/jee/toaa225.

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Abstract Tephritid flies released in sterile insect technique pest management programs are usually marked with fluorescent dyes so that they can be distinguished from wild flies in monitoring traps. Dyes can have adverse effects on emergence, quality, and survival, which can impact sterile insect technique (SIT) success, and so it is important to identify dyes and doses that maximize marking efficacy while minimizing deleterious effects on fly quality. This study examines the effects of five fluorescent dye products, Fluoro Pink, Fluoro Orange, Stella Green, Arc Chrome, and Astral Pink applied at four dose levels (1, 2, 3, and 4 g/liter) on Queensland fruit fly. All dye products caused a similar dose-dependent reduction in percentage of adult emergence. Incidence of morphological deformity of emerged adults increased with dose, and this trend was similar for all dye products. No effects of dye product or dose were found on survival rates over the first 35 d of adulthood, although females tended to have higher survival than males. Visibility varied with dose and dye product; 1 g/liter dye was less visible than 2, 3, or 4 g/liter, and Stella green had lower visibility than other dyes. All of the tested dyes except for Stella green were similar in all assessed metrics of fly performance and are recommended for use in SIT programs.

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Zhao, Zhong, Chris Hurren, Mingwen Zhang, Liming Zhou, Jihong Wu, and Lu Sun. "In Situ Synthesis of a Double-Layer Chitosan Coating on Cotton Fabric to Improve the Color Fastness of Sodium Copper Chlorophyllin." Materials 13, no. 23 (November 26, 2020): 5365. http://dx.doi.org/10.3390/ma13235365.

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Natural dye’s poor affinity for cotton and poor fastness properties still hinder its applications in the textile industry. In this study, a doubled-layered chitosan coating was cured on cotton fabric to serve as bio-mordant and form a protective layer on it. Under the optimal treatment conditions, the maximum qe (adsorption amount) of the natural dye sodium copper chlorophyllin (SCC) calculated from the Langmuir isothermal model was raised from 4.5 g/kg to 19.8 g/kg. The dye uptake of the treated fabric was improved from 22.7% to 96.4% at 1% o.w.f. dye concentration. By a second chitosan layer cured on the dyed fabric via the cross-linking method, the wash fastness of the cotton fabric dyed with SCC can be improved from 3 to 5 (ISO 105 C-06). The natural source of the biopolymer material, chitosan, and its ability to biodegrade at end of life met with the initial objective of green manufacturing in applying natural dyes and natural materials to the textile industry.

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Shamsheer, Bushra, Tahira Aziz Mughal, Zubaida Yousaf, Nadia Riaz, Arusa Aftab, and Maria Zahoor. "Green Synthesis of Dyes and Appliance on Silk by Using Metamordating Technique." Biological Sciences - PJSIR 64, no. 2 (July 6, 2021): 116–25. http://dx.doi.org/10.52763/pjsir.biol.sci.64.2.2021.116.125.

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The main idea of extracting dyes from plant (natural) sources is to avoid the environmental pollution. Natural dye from plants has been given much interest in recent years due to the threat and harmful effects are used by synthetic dyes and environmental awareness created by researchers. The drawback of synthetic dyes is that they are not durable as they do not completely fix on all kind of fabric and remaining dyestuff drained into rivers, becoming the cause of water pollution as well as they cause diseases in human being like cancer and allergies. On the other hand, natural dyes are eco-friendly and find use in the colouring of textiles, drugs and cosmetics etc. Owing to their non-toxic effects, they are also even used for colouring various food products. Mordents are used in natural dyes which enhance the colour of dye and stick it on fabric. Due to lack of availability of precise technical knowledge on the extracting and dyeing technique, it has not commercially succeeded like the synthetic dyes. Hence, the present study was planned to isolate eco-friendly dyes from the bark of the plants (Ziziphus jujube Mill., Albizialebbeck L., Cordia dichotoma G Forst., Ficus benghalensis L. and Cassia fistula L.) and the roots of Ficus benghalensis L. Later on the dyes were applied on silk fabric by using metamordating technique. Then fastness properties like rubbing, heating, washing and sunlight were evaluated by using gray scale. F. benghalensis showed excellent fastness properties. Z. jujube showed series of colour variations on silk. Therefore, the bark and root of these plants can be successfully used for dyeing of silk. Natural dyes worldwide should be increased to prevent us from pollution and other harmful effects.

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Rehman, Rabia, Sara Jan Muhammad, and Muhammad Arshad. "Brilliant Green and Acid Orange 74 Dyes Removal from Water by Pinus roxburghii Leaves in Naturally Benign Way: An Application of Green Chemistry." Journal of Chemistry 2019 (March 11, 2019): 1–10. http://dx.doi.org/10.1155/2019/3573704.

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The purpose of this study was to use low cost and easily accessible biosorbent for batch-scale elimination of brilliant green and acid orange 74 dyes from aqueous solution. Pinus roxburghii leaves were utilized to study their dye-eliminating capacities. The adsorbent was characterized by FTIR, TGA, DTA, and SEM. The optimized conditions for brilliant green and acid orange 74 dye elimination were adsorbent dose, 1.2 and 1.8 g; contact time, 30 and 45 min; pH, 2 and 1; temperature, 50°C and 60°C; and agitation speed, 125 rpm and 50 rpm for BG and AO-74, respectively. Adsorption records well fitted Langmuir isotherm. Possibility of the procedure was shown by negative values of the thermodynamic parameter ∆G° for both dyes. Kinetic studies showed that adsorption of BG and AO-74 dyes from watery solution by PR leaves followed pseudo-second-order kinetics.

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Dissertations / Theses on the topic "Green Dyes"

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Aly, Sherif Abdel moez Mohamed Ahmed. "New routes for the synthesis of novel aceanthrene green, phenazine and azaperylene dyes and lateral ring extension of aceanthrene green dyes." Diss., Ludwig-Maximilians-Universität München, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-161845.

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Armstrong, Lyle. "Synthesis, spectra and photochemistry of trifluoroethyl substituted triphenylmethane dyes." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303385.

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Goetz, Charity. "Textile dyes techniques and their effects on the environment with a recommendation for dyers concerning the Green effect /." Lynchburg, Va. : Liberty University, 2008. http://digitalcommons.liberty.edu.

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Yukruk, Funda. "Water Soluble Green Perylenediimide (pdi) Dyes As Potential Sensitizers For Photodynamic Therapy." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605693/index.pdf.

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Photodynamic therapy has been established as one of the approaches for the treatment of various malignant tumors. While most of the reagents used for this purpose are porphyrin derivatives, there is a strong motivation for finding novel and better sensitizers. Perylenediimides are known for their photo- and chemical stability, but they do not have absorptions in the red end of the visible spectrum. However, recently reported green perylenediimides which have dialkylamino substituents on the perylene core, provide an alternative. To that end, we have designed and synthesized novel green perylenediimides with remarkable water solubility at neutral pH and absorption peaks beyond 650 nm. We demonstrated that on red-light excitation, singlet oxygen trap 1,3-diphenyl-iso-benzofuran is rapidly degraded. We also carried out cell culture experiments
an important parameter to be optimized for practical application as a novel photodynamic therapy agent was the excited dye toxicity to dark toxicity. Our results confirmed that these novel perylenediimides acted as sensitizers generating singlet oxygen and the initial in vitro biological experiments demonstrated their potential utility in photodynamic therapy.

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Aly, Sherif Abdel moez Mohamed Ahmed [Verfasser], and Heinz [Akademischer Betreuer] Langhals. "New Routes for the Synthesis of Novel Aceanthrene Green, Phenazine and Azaperylene Dyes and Lateral Ring Extension of Aceanthrene Green Dyes / Sherif Abdel moez Mohamed Ahmed Aly. Betreuer: Heinz Langhals." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2011. http://d-nb.info/1015084206/34.

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Trujillo, Rebollo Andres. "ROLE OF BRILLIANT GREEN ON THE DETECTION AND SEPARATION OF NON-CHROMOPHORIC ANALYTES BY REVERSED-PHASE LIQUID CHROMATOGRAPHY (DIMERIZATION)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275434.

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Correia, Sandra Filipa Henriques. "Organic-inorganic hybrid materials for green photonics: luminescent solar concentrators." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/17407.

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Doutoramento em Física
Luminescent solar concentrators are inexpensive devices that aim to increase the efficiency of photovoltaic cells and promote the urban integration of photovoltaic devices, with unprecedented possibilities of energy harvesting through the façade of buildings, urban furniture or wearable fabrics. Generally, they consist of a transparent matrix coated or doped with active optical centres that absorb the incident solar radiation, which is re-emitted at a specific wavelength and transferred by total internal reflection to the edges where the photovoltaic cells are located. The main objective of this work is the production of luminescent solar concentrators whose optically active layer is based on organic-inorganic hybrid materials doped with europium ions or organic dyes, in particular, Rhodamine 6G and Rhodamine 800. Rhodamine 800, as opposed to europium ions and Rhodamine 6G which emit in the visible range, emits in the near infrared (NIR) range, which is an advantage for crystalline Si-based photovoltaic cells, whose efficiency is greater in the NIR. In this work, although the luminescent solar concentrators with planar geometry are addressed, the main focus is the use cylindrical geometry. The use of this type of geometry allows the effect of concentration to be higher relative to the planar geometry, since the ratio between the exposed area and the area of the edges is increased. The cylindrical geometry is exploited by producing luminescent solar concentrators based on polymer optical fibre (plastic) where the optically active layer is on the outside (as a coating) or inside (as a filling in the hollow core) of the optical fibre. Furthermore, the possibility of increasing the exposed area was also dealt with the production of bundles of luminescent solar concentrators in which the plastic optical fibres are placed side by side and, also, by fabricating luminescent solar concentrators with length in the metre scale.
Os concentradores solares luminescentes são dispositivos de baixo custo que têm como objetivo aumentar a eficiência de células fotovoltaicas e promover a integração de dispositivos fotovoltaicos em elementos do dia-a-dia, tornando possível a captura de energia solar, através da fachada de edifícios, mobiliário urbano ou em têxteis. Geralmente, consistem numa matriz transparente coberta ou dopada com centros óticos ativos, capazes de absorver a radiação solar incidente e reemiti-la com um comprimento de onda específico que será transportada, através de reflexão interna total, para as extremidades da matriz onde se encontra(m) a(s) célula(s) fotovoltaica(s). O principal objetivo deste trabalho consiste na produção de concentradores solares luminescentes cuja camada ótica ativa é baseada em materiais híbridos orgânicos-inorgânicos dopados com iões lantanídeos (európio, Eu3+) ou corantes orgânicos, nomeadamente, Rodamina 6G e Rodamina 800. A Rodamina 800, ao contrário dos iões de európio e da Rodamina 6G que emitem na gama do visível, emite na região espetral do infravermelho próximo (NIR), que se revela uma vantagem quando a célula fotovoltaica em uso é composta de silício cristalino, cuja gama de maior eficiência é no NIR. Neste trabalho, apesar de serem abordados concentradores solares luminescentes com geometria planar, o principal foco é a utilização da geometria cilíndrica. Este tipo de geometria permite que o efeito de concentração seja superior, relativamente à geometria planar, uma vez que a razão entre a área exposta e a área das extremidades é aumentada. A geometria cilíndrica é explorada, através da produção de concentradores solares luminescentes com base em fibra ótica polimérica (plástica) em que a camada ótica ativa se encontra no exterior (como um revestimento) ou no interior (como um preenchimento do núcleo oco). Além disso, a possibilidade de aumentar a área exposta foi, também, abordada com o fabrico de uma matriz de concentradores solares luminescentes colocados lado a lado e, também, com o fabrico de concentradores solares luminescentes na escala do metro.

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Abdoul, Hayman Jalal. "Polysaccharide derived mesoporous carbonaceous materials for bulky dyes and metals adsorption from wastewater : green chemical technology for the production of polysaccharide derived mesoporous carbonaceous materials for wastewater treatment." Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/8800/.

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The current world crisis in the demand for water is a real problem for all forms of life on our planet. For years, scientists have tried to propose various technologies which might be able to clean and reuse contaminated water. It is crucial to develop a sustainable low cost form of technology. This is especially important for Third World countries, where the ability to get high level technology is difficult and ideally, the form of technology should be cheap, simple and based on the local resources. One of the most available local resources is a polysaccharide such as starch, pectin, cellulose or alginic acid. The major goal of this dissertation is to develop a green form of technology to capture potentially harmful, toxic or valuable compounds from waste water using mesoporous carbonaceous materials based on the local polysaccharide resources. To achieve this target, a novel and improved method of synthesis of mesoporous carbonaceous materials from starch (hereafter referred to as Starbon® ) and alginic acid (hereafter referred to as Algibon) was established at the beginning of the project. Based on this method, a number of mesoporous materials with different textural and surface properties have been generated and characterised by various techniques including nitrogen porosimetry, solid state NMR, DRIFT spectroscopy, electron microscopy, elemental analysis and ash content tests. Some of the major water pollutants in industrial wastes are dyes from textile industry and heavy metals from mining, steel industry, welding, batteries, refinery, fertiliser and other processes. Therefore, the produced materials were systematically tested as dye adsorbers. Bulky azodyes, which represent 75% of the current cotton industry market, were selected as model absorbates. A wide range of Algibons and Starbons materials with different properties (from the completely hydrophilic to completely hydrophobic and with different micro/mesopore volumes and ratios) enabled the optimum material to be found for certain types of adsorption process. It was found that in this type of adsorption, Starbons materials cannot compete with commercially available adsorbents. In contrast, Algibon has demonstrated great potential and significantly outperformed the commercially available adsorbents such as activated carbon (up to 6 times more) for the uptake of a range of bulky dyes. The adsorption data reveals that the BET specific surface area (N2-adsorption) was not the only governing factor and that the dominant mesoporous character of these materials, the accessibility of the pores versus the bulkiness of the dyes and the nature of the surface functionality (hydrophobic versus hydrophilic) also played key roles. The maximum adsorption capacity of Algibon prepared at 800o C (A800) is markedly higher than the one recorded for A450 and outperforms Norit as a commercially available activated carbon (AC) adsorbent. It was found that the higher adsorption capacity of A800 relates to a higher surface area in the mesoporous region. Moreover, it was found that the energy of adsorption is smaller for A800 than for AC. This shows that A800 is not only the preferred adsorbent but will also enable a more effective and easier recovery of the dyes. In addition, the project involved the use of the developed Starbon materials to recover metals. This application is crucial not only for the cleaning of waste waters but also for recovering the valuable and critical metals from solid wastes. Some of these metals are in the EU critical list of elements due to their significant demand in modern economy technologies or are substantial components of industrial waste. These elements are in short supply because of their large demand in growing economy and their scarce abundance in the world. Therefore, a variety of Starbons were screened to test the selectivity of the polysaccharide derived carbonaceous materials towards the high value metals from digested solid wastes consisting of Pulverised fly ash (PFA), Red Mud (RM), Bottom ash (BA), Titano gypsum (TiG), Red Titano gypsum (RTiG) and Phospho Gypsum (PG). Further investigation of metals adsorption based on Algibon was systematically conducted. A800 which demonstrated the most promising results early on and was found to be the most stable material, and was used as the adsorber. A solution containing four high value metal ions (i.e. Co, Cu, Ag and Cd) were selected for the adsorption experiment. Investigation focused on the nature of the metal ions and how they affect the kinetic parameters of adsorption in a detailed experimental analysis of the model system. Different types of adsorption isotherms were applied. The maximum adsorption capacity for each metal was found from the fit isotherm type. Kinetic adsorption was tested and kinetic order model study was carried out.

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Souza, Janilson Lima. "MESOCARPO DO COCO VERDE (Cocos nucífera) COMO ADSORVENTE PARA OS CORANTES: TURQUESA REMAZOL E AZUL REMAZOL." Universidade Federal do Maranhão, 2009. http://tedebc.ufma.br:8080/jspui/handle/tede/902.

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Made available in DSpace on 2016-08-19T12:56:33Z (GMT). No. of bitstreams: 1 Janilson Lima Souza.pdf: 1888741 bytes, checksum: afd5433449dae962b746bb158a2b3c5e (MD5) Previous issue date: 2009-10-15
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In this work the green coconut mesocarp was used as adsorbent towards two textile dyes: Turquoise Remazol and Blue Remazol. The adsorbent was triturated, washed several times with water for extraction of soluble matter, dried in oven and sieved to obtain particle size between 0.088 and 0.177 mm. Determinations of C/H/N content were performed and the obtained results were: 45.20, 6.24 and 0.74%, respectively. The study of the thermal stability showed that adsorbent is mainly affected up to 200 °C. The infrared and 13C RMN spectra allowed assigning unambiguously vibrational bands the chemical shift characteristics of lignocellulosic materials. According to X-ray and micrographies techniques the adsorbent has an amorphous and irregular structure. The most of the pores diameter values are around 10 to 20 μm, meaning that it can be classified as a macroporous material. The pHzpc of the mesocarp was estimated in 4.1, and the best removal efficiency and uptake were reached at pH 2.0 for both dyes. The kinetic studies were performed at different temperatures (10, 20, 30, 40, 50 oC) , and the best observed uptake results were 91.95%, at 50 ºC, for the Turquoise Remazol, and 97.12%, at 10 ºC, for the Blue Remazol. The best kinetic model that fit well with all the experimental results was the pseudo-second order model (R2 > 0.999), and the observed average contact time for the systems reach the equilibrium was 90 min. The graphic model of adsorption intraparticular presented three lineal segments, indicating that in the adsorption of these dyes three processes are involved: external diffusion or superficial interaction adsorbent/adsorbate, diffusion of the adsorbate into the pores of the adsorbent and interaction of the adsorvate with the active sites inside the pores. The adsorption isotherms followed the Langmuir´s model, and the maximum adsorption values varied between 49.27 to 60.25 mg/g (Turquoise Remazol) and 84.75 to 80.64 mg/g (Blue Remazol) at the temperature interval from 10 to 50 ºC. The thermodynamic parameters confirmed the spontaneity for the two processes of adsorption being endothermic with entropy increase for the Turquoise Remazol and exothermic with entropy increase for the Blue Remazol. The dessorption of the dyes were accomplished in alkaline medium (pH 8,0), and the recovered amounts dyes were of 41.5% (turquoise remazol) and 52.5%, for an equilibrium time of 90 minutes.
Neste trabalho o mesocarpo de coco verde foi utilizado como adsorvente para os dois corantes têxteis: Turquesa Remazol e Azul Remazol. O adsorvente foi triturado, submetido à diversas lavagens para extração de matéria solúvel em água, secado e peneirado obtendo uma granulometria entre 0,088 a 0,177 mm. Teores de microanálise determinaram % de C, H e N sendo iguais a 45,20; 6,24 e 0,74 %, respectivamente. Estudos de estabilidade térmica do adsorvente mostraram que este se mantém inalterado até 200 °C. As principais freqüências vibracionais apresentaram bandas características de materiais lignocelulósicos. A técnica de raios-X determinou um caráter amorfo, e as micrografias mostraram que a superfície do material apresenta morfologia irregular, com diâmetros de poros entre 10-20 μm e uma estrutura macroporosa. O espectro de RMN de 13C é característico de materiais celulósicos. O pHzpc do mesocarpo foi estimado em 4,1, sendo observado uma melhor eficiência de remoção em pH 2,0 para ambos os corantes. As cinéticas foram realizadas em diferentes temperaturas (10, 20, 30, 40 e 50ºC) cujas quantidades máximas removidas foram 91,95 % (50 ºC) para o turquesa remazol e 97,12 % (10 ºC) para o azul remazol, sendo o modelo de pseudo-segunda ordem (R2 > 0,999) o mais adequado com quantidades adsorvidas variando entre 29,93 36,78 mg/g (turquesa remazol) e 38,63 38,29 mg/g (azul remazol) nas faixas de 10 a 50 ºC para um tempo de equilíbrio de 90 minutos. O modelo gráfico de adsorção intraparticular apresentou três segmentos lineares, indicando que na adsorção dos dois corantes estão envolvidos três processos: interação adsorvente/adsorvato superficial externa, difusão do adsorvato dentro dos poros do adsorvente e interação do adsorvato com os sítios ativos dentro dos poros. As isotermas de adsorções foram avaliadas, sendo que as quantidades máximas adsorvidas variaram entre 49,27 60,25 mg/g (turquesa remazol) e 84,75 80,64 mg/g (azul remazol) nas faixas de temperatura de 10 a 50 ºC. Os resultados obtidos seguiram o modelo de Langmuir (R2 > 0,985). Os parâmetros termodinâmicos confirmaram a espontaneidade para os dois processos de adsorção sendo endotérmico com aumento de entropia para o turquesa remazol e exotérmico com aumento de entropia para o azul remazol. A dessorção dos corantes foi realizada em meio alcalino (pH 8,0), sendo recuperado 41,5 % para o turquesa remazol e 52,5 % para o azul remazol em um tempo de equilíbrio de 90 minutos.

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Alt, Aizhan [Verfasser]. "The effects of Rho-kinase inhibitor H-1152P, the dyes acid violet-17 and indocyanine green on retinal function in the electrophysiological model of the isolated and perfused vertebrate retina / Aizhan Alt." Lübeck : Zentrale Hochschulbibliothek Lübeck, 2015. http://d-nb.info/1078974322/34.

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Books on the topic "Green Dyes"

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Sharma, Sanjay K., ed. Green Chemistry for Dyes Removal from Wastewater. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118721001.

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Sharma, Sanjay K. Green chemistry for dyes removal from wastewater: Research trends and applications. Hoboken, New Jersey: Scrivener Publishing/Wiley, 2015.

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Inamuddin, Mohd Imran Ahamed, Eric Lichtfouse, and Abdullah M. Asiri, eds. Green Adsorbents to Remove Metals, Dyes and Boron from Polluted Water. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-47400-3.

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International Conference on Eco-Dyeing, Finishing and Green Chemistry (2011 Hangzhou, China). Eco-Dyeing, Finishing and Green Chemistry: Selected, peer reviewed papers from the 2011 International Conference on Eco-Dyeing, Finishing, and Green Chemistry (EDFGC 2011), June 8-12, 2011, Hangzhou, China. Durnten-Zurich, Switzerland: Trans Tech Publications, 2012.

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Amar, Agarwal, ed. Fundus fluorescein and indocyanine green angiography: A textbook and atlas. Thorofare, NJ: SLACK, 2008.

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service), SpringerLink (Online, ed. Adsorption of Reactive Red 158 Dye by Chemically Treated Cocos Nucifera L. Shell Powder: Adsorption of Reactive Red 158 by Cocos Nucifera L. Dordrecht: The Author(s), 2011.

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1945-, Chance Jane, and Consortium for the Teaching of the Middle Ages., eds. The assembly of gods =: Le assemble de dyeus, or, Banquet of gods and goddesses, with the discourse of reason and sensuality. Kalamazoo, Mich: Published for TEAMS (the Consortium for the Teaching of the Middle Ages) in association with the University of Rochester by Medieval Institute Publications, Western Michigan University, 1999.

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Jack, Alvin R. Traveltime and dispersion of a soluble dye in the South Branch Potomac River, Petersburg to Green Spring, West Virginia. Charleston, W. Va: U.S. Dept. of the Interior, Geological Survey, 1986.

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Green Dyes and Pigments: Classes and Applications. Lulu Press, Inc., 2016.

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Ahmed, Shakeel, Pintu Pandit, Kunal Singha, and Subhankar Maity. Textile Dyes and Pigments: A Green Chemistry Approach. Wiley & Sons, Incorporated, John, 2022.

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Book chapters on the topic "Green Dyes"

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Mondal, Sourav, Mihir Kumar Purkait, and Sirshendu De. "Adsorption of Dyes." In Green Chemistry and Sustainable Technology, 49–98. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6293-3_2.

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Mondal, Sourav, Mihir Kumar Purkait, and Sirshendu De. "Nanofiltration of Dyes." In Green Chemistry and Sustainable Technology, 153–97. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6293-3_5.

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Fresno, Fernando, and María Dolores Hernández-Alonso. "Sensitizers: Dyes and Quantum Dots." In Green Energy and Technology, 329–43. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5061-9_16.

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Gandorfer, Arnd, Christos Haritoglou, and Anselm Kampik. "Toxicity of Indocyanine Green in Vitreoretinal Surgery." In Vital Dyes in Vitreoretinal Surgery, 69–81. Basel: KARGER, 2008. http://dx.doi.org/10.1159/000138974.

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Mondal, Sourav, Mihir Kumar Purkait, and Sirshendu De. "Adsorption of Dyes from Actual Effluent." In Green Chemistry and Sustainable Technology, 99–139. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6293-3_3.

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Grisanti, Salvatore, Andreas Altvater, and Swaantje Peters. "Safety Parameters for Indocyanine Green in Vitreoretinal Surgery." In Vital Dyes in Vitreoretinal Surgery, 43–68. Basel: KARGER, 2008. http://dx.doi.org/10.1159/000138924.

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Freeman, Harold S., and Laura C. Edwards. "Iron-Complexed Dyes: Colorants in Green Chemistry." In ACS Symposium Series, 18–32. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2000-0767.ch003.

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Rani, Manviri, and Uma Shanker. "Removal of Organic Dyes by Functionalized Nanomaterials." In Handbook of Green and Sustainable Nanotechnology, 1–32. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-69023-6_52-1.

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Wollensak, Gregor. "Biomechanical Changes of the Internal Limiting Membrane after Indocyanine Green Staining." In Vital Dyes in Vitreoretinal Surgery, 82–90. Basel: KARGER, 2008. http://dx.doi.org/10.1159/000138975.

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Dotto, Guilherme L., Sanjay K. Sharma, and Luiz A. A. Pinto. "Biosorption of Organic Dyes: Research Opportunities and Challenges." In Green Chemistry for Dyes Removal from Wastewater, 295–329. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118721001.ch8.

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Conference papers on the topic "Green Dyes"

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Kopylova, Tat'yana N., A. V. Reznichenko, Georgy V. Mayer, Lyibov G. Samsonova, V. A. Svetlichny, Rimma T. Kuznetsova, Viktor B. Sukhanov, and E. N. Telminov. "Blue-green laser radiation from dyes in matrix." In International Conference on Atomic and Molecular Pulsed Lasers, edited by Victor F. Tarasenko, Georgy V. Mayer, and Gueorgii G. Petrash. SPIE, 1998. http://dx.doi.org/10.1117/12.311937.

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Jyoti, Anitha K., Bhanu Prakash, Ramesh L. Dean, and M. Marsaline Beno. "Comparative Energy Performance Analysis at Dyes and Coating Industry." In 2021 International Conference on Computing, Communication and Green Engineering (CCGE). IEEE, 2021. http://dx.doi.org/10.1109/ccge50943.2021.9776474.

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Oyedeji, F. O., and J. O. Momoh. "Potential Human Hair and Sheep Wool Dyeing Characteristics of Hair Colour Formulations Prepared from Four Vegetable Dyes." In 28th iSTEAMS Multidisciplinary Research Conference AIUWA The Gambia. Society for Multidisciplinary and Advanced Research Techniques - Creative Research Publishers, 2021. http://dx.doi.org/10.22624/aims/isteams-2021/v28n2p11.

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Man insatiable desires often leads him to many choices. Some functional, others for the purpose of decoration or acceptability. The dyeing of hair can be comfortably placed in any of the three categories. The production of hair colours is a multi-billion dollar industry that involves the use of both plant-derived and synthetic dyes. Unlike synthetic dyes which can be toxic and harmful to the environment; natural dyes are biodegradable, non-toxic and compatible with environment. In the present study the comparative black – brown colouring effect of seven dye formulations made from ethanol and chloroform extracted pigments of some local dye yielding plants; Lawsonia inermis, Loncocarpus cyanescens, Pterocarpus osun and Trema orientalis on grey human hair and sheep wool was observed and recorded after two hours of dye uptake; storage at room temperature for 4 days and exposure to sunlight for 4 days. % yield of extracted dye ranged from 1.04 - 3.20 in the order Lawsonia inermis < Trema orientalis < Lonchocarpus cyanescens < Pterocarpus osun dye. The colours of the dyes obtained were orange (Lawsonia inermis), yellow (Loncocarpus cyanescens), dark red (Pterocarpus osun) and dark green (Trema orientalis). The human hair took up the dye more readily than the sheep wool and the black-brown colouring effect was maximum with formulation 7 and in the order PF 7>PF 3 > PF 5 > PF 4 > PF 1> PF 6 >P2 with the colour being retained for the greatest period of time at room temperature while fading gradually with the length of exposure to sunlight for both human hair and wool. The colour deepened however for sheep wool, with length of stay at room temperature. In conclusion, the natural dye formulations coloured the hair better than sheep wool, it may therefore be suitable for the formulation of hair colouring solution, after toxicity tests, colour fixing and modification studies have been carried out on the dyes. Keywords: Lawsonia inermis, Loncocarpus cyanescens, Pterocarpus osun, Trema orientalis, Human hair, Sheep wool, Vegetable dyes.

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Anh, Nguyen Thai, Tran Tien Khoi, Nguyen Nhat Huy, Hoang Thi Ngoc Mai, and Nguyen Hong Ngoc Linh. "Treatment of Wastewater Containing Reactive Dyes by electro-Fenton Method." In 2020 5th International Conference on Green Technology and Sustainable Development (GTSD). IEEE, 2020. http://dx.doi.org/10.1109/gtsd50082.2020.9303141.

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Chan, Yin Yin, Yean Ling Pang, and Steven Lim. "Heat treatment effect of zinc oxide on the sonocatalytic degradation of organic dyes." In INTERNATIONAL SYMPOSIUM ON GREEN AND SUSTAINABLE TECHNOLOGY (ISGST2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5126544.

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Kupryashina, M. A., T. E. Pylaev, and V. E. Nikitina. "The influence of malachite green on the level of transcriptional expression of the laccase and DyP-peroxidase genes of the Azospirillum brasilense." In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.142.

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Malachite green (MG), a widely-used and recalcitrant dye, has been confirmed to be carcinogenic and mutagenic against many organisms. Herein, we were aimed at the investigation of the hypothetic role of ligninolytic bacterial enzymes similar to fungal ones in the degradation of synthetic dyes. A multiple increase in the laccases and DyP-peroxidases genes expression level was recorded by RT-qPCR for bacteria of the genus Azospirillum in the presence of MG.

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Setyaningtyas, Tien, Mardiyah Kurniasih, Afrizal Diaz Aztiza Nur Azizi, Kapti Riyani, and Dwi Kartika. "Synthesis of chitosan for removal of methyl orange and malachite green dyes." In VIII INTERNATIONAL ANNUAL CONFERENCE “INDUSTRIAL TECHNOLOGIES AND ENGINEERING” (ICITE 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0103999.

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Selvi, S. Keerthana, and Sangeetha Nachimuthu. "Biosorption of reactive dyes by green synthesis of nanocomposite using Moringa olifera." In PROCEEDINGS OF THE 4TH NATIONAL CONFERENCE ON CURRENT AND EMERGING PROCESS TECHNOLOGIES E-CONCEPT-2021. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0070228.

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Firyanto, Rudi, Soebiyono, and Dian Anung Putri. "Utilization of Red Onion Skin Waste as Natural Dyes." In The 7th Engineering International Conference (EIC), Engineering International Conference on Education, Concept and Application on Green Technology. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0009012704350438.

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Firyanto, Rudi, Soebiyono, and Dian Anung Putri. "Utilization of Red Onion Skin Waste as Natural Dyes." In The 7th Engineering International Conference (EIC), Engineering International Conference on Education, Concept and Application on Green Technology. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0009012704470450.

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Reports on the topic "Green Dyes"

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Cramer, Hailey E., Mark H. Griep, and Shashi P. Karna. Synthesis, Characterization, and Application of Gold Nanoparticles in Green Nanochemistry Dye-Sensitized Solar Cells. Fort Belvoir, VA: Defense Technical Information Center, June 2012. http://dx.doi.org/10.21236/ada568748.

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Zaharieva, Katerina, Silvia Dimova, Mariya Kyulavska, Filip Ublekov, Irina Stambolova, Ljubomir Dimitrov, and Vladimir Blaskov. Photocatalytic Behaviour of Zinc Oxide/Polystyrene Nanocomposite for Removal of Malachite Green Dye under UV-Light. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, February 2020. http://dx.doi.org/10.7546/crabs.2020.02.08.

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Traveltime and dispersion of a soluble dye in the South Branch Potomac River, Petersburg to Green Spring, West Virginia. US Geological Survey, 1986. http://dx.doi.org/10.3133/wri844167.

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