Relevant bibliographies by topics / Decolorization. eng

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Academic literature on the topic 'Decolorization. eng'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Decolorization. eng"

1

Afiya, Hamisu, Erkurt Emrah Ahmet, and M. Manjur Shah. "Enzymatic Decolorization of Remazol Brilliant Blue Royal (RB 19) textile dye by White Rot Fungi." Journal of Applied and Advanced Research 4, no. 1 (January 27, 2019): 11. http://dx.doi.org/10.21839/jaar.2019.v4i1.260.

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Synthetic dyes are widely used by different industries with over 7 ×105 metric tons produce globally each year. Dyes pose adverse effects including chemical oxygen demand, visual pollution, cytotoxicity, genotoxicity, mutagenicity and carcinogenicity on various types of living organisms. The versatile white rot fungi (basidiomycetes fungi) have developed specialized ligninolytic enzymes for reductive cleavage of dyes and xenobiotics. The present study optimized the decolorization of Remazol brilliant blue royal (RBBR) dye by enzymatic extracts of Coriolus versicolor and Pleurotusostreatus. Experiments were carried out by varying one parameter i.e. pH (2.5-6.5), temperature (30oC-60oC), enzyme activity (3.3U-20U), dye concentration (10mg/L-125mg/L) and time (0-480mins), while others constant to study its effects on decolorization of RBBR. From the results obtained, the optimum conditions for decolorization of RBBR by extracts of C. versicolor and P. ostreatus were pH 4.0, temperature of 300C, enzyme activity 20U, dye concentrations of 100mg/L and 50mg/L for C. versicolor and P. ostreatus respectively at the end of 480 minutes. At the optimized conditions, decolorizations for C. versicolor and P. ostreatus were 80.42% and 70.42% respectively. Highest laccase activity (19.50U) was recorded in C. versicolor compare to P. ostreatus (1.41U).
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2

Liu, H. J., and J. H. Qu. "Decolorization of reactive bright red K2G dye: electrochemical process catalyzed by manganese mineral." Water Science and Technology 46, no. 11-12 (December 1, 2002): 133–38. http://dx.doi.org/10.2166/wst.2002.0728.

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This paper presents the results of the decolorization of azo dye K2G by the electrochemical process catalyzed by manganese mineral. It is proved that the MnOOH(s), main component of the manganese mineral, can catalyze the electrochemical process and enhance the decolorization efficiency. X-ray powder diffraction spectrum shows that the content of MnOOH(s) has not been changed at the end of the reaction. The effects of initial pH value, current density, concentration of electrolyte on the decolorization efficiency of the dye were investigated in detail. The initial pH effect on the decolorization efficiency of K2G dye is found not to be significant. The optimum current density is 0.26A/dm2. In addition, a proposed catalyzing mechanism of manganese mineral is discussed in this paper.
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Arroyo-Figueroa, Gabriela, Graciela M. L. Ruiz-Aguilar, Leticia López-Martínez, Guillermo González-Sánchez, Germán Cuevas-Rodríguez, and Refugio Rodríguez-Vázquez. "Treatment of a Textile Effluent from Dyeing with Cochineal Extracts UsingTrametes versicolorFungus." Scientific World JOURNAL 11 (2011): 1005–16. http://dx.doi.org/10.1100/tsw.2011.99.

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Trametes versicolor(Tv) fungus can degrade synthetic dyes that contain azo groups, anthraquinone, triphenylmethane polymers, and heterocyclic groups. However, no references have been found related to the degradation of natural dyes, such as the carminic acid that is contained in the cochineal extract. Experiments to determine the decolorization of the effluent used in the cotton dyeing process with cochineal extract by means of Tv fungus were done. Treatments to determine decolorization in the presence or absence of Kirk's medium, glucose, and fungus, with an addition of 50% (v v-1) of nonsterilized effluent were performed. Physicochemical characterization was performed at the start and end of the treatment. Degradation kinetics were determined. A direct relationship was found between the dry weight of fungi, pH, and the decolorization system, with higher decolorization at lower pH levels (pH ~4.3). High decolorization (81% ± 0.09; 88% ± 0.17; and 99% ± 0.04) for three of the eight treatments (Kirk's medium without glucose, Kirk's medium with glucose, and without medium with glucose, respectively) was found. Toxicity tests determined an increase in the initial effluent toxicity (7.33 TU) compared with the final treatment (47.73 TU) in a period of 11 days. For this system, a degradation sequence of the carminic acid structure present in the effluent by the Tv fungus is suggested, in which it is seen that metabolites still containing aromatic structures are generated.
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Hathaisamit, K., W. Pengmula, T. Wesamula, and Sayan Pudwat. "Photocatalytic Decolorization of Dyes for Nano-Structures of Titanium Dioxide (TiO2) Films." Advanced Materials Research 93-94 (January 2010): 603–6. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.603.

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Application of nano-structures of titanium dioxide (TiO2) films on photocatalytic activities of organic dyes was investigated. Methylene blue (MB) and cation yellow X-Gl 200% were used as organic dyes to observe decolorization. The TiO2 films were prepared on glass substrate by reactive DC magnetron sputtering. The films had thickness, grain size and root mean square surface roughness of 300 nm,  40 nm and  4 nm, respectively. Coated-TiO2 on glass and uncoated TiO2 (glass) were immerged in MB and cation yellow dyes solution. A weak ultraviolet (UV) A at peak wavelength  365 nm and intensity of 0.19 mW/cm2 was irradiated. Absorbance spectra of dyes at different UV irradiation time were observed. The efficiency of decolorization increased as UV irradiation time increased. At UV irradiation time 120 hours, coated-TiO2 showed higher percentage decolorization of MB than uncoated-TiO2 about 64%. While, at UV irradiation time 48 hours, coated-TiO2 showed higher percentage decolorization of cation yellow than uncoated-TiO2 about 84%. Under photocatalysis process of TiO2 films, at the end, MB (about 120 hours) and cation yellow dyes (about 48 hours) change to be colorless.
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5

Akdogan, Hatice Ardag, and Merve Canpolat Topuz. "Comparative Studies of Remazol Brillant Blue Removal by Immobilized Organisms; Investigation of Metabolites by GC/MS and FTIR Spectrometry." Journal of AOAC INTERNATIONAL 98, no. 2 (March 1, 2015): 445–49. http://dx.doi.org/10.5740/jaoacint.12-371.

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Abstract Reactive dyes are important chemical pollutants from textile industries. Treatment of effluents from dye-based industries poses a major problem, and biotreatment with white rot fungi seems to be a viable option. The biological treatment of synthetic dyes at a low cost and in the shortest possible time is used especially in dye and textile industries and leads to pollution in the wastewater dumped into the environment by these industries. For this study, decolorization of the recalcitrant dye Remazol Brilliant Blue R by immobilized Pleurotus ostreatus and Coprinus plicatilis was investigated. This dye was removed 100% (dye concentration: 10.0 mg/L) by both immobilized organisms. Extracellular ligninolytic enzyme activities were also measured during the decolorization. There was an attempt to identify metabolites with FTIR spectrometry and GC/MS at the end of the decolorization. These results indicated that the samples did not include any detectable metabolite.
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Liu, Ning, and Tao Liu. "Adsorption and Decoloration of Nitroso Dye Based on Eggshell Membrane." Advanced Materials Research 183-185 (January 2011): 963–66. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.963.

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Eggshell membrane is a natural biomaterial with macropores lattice and high surface area. The bio-sorption and decolorization of organic dye eosin B was investigated based on eggshell membrane. The effect of adsorption time, pH value and temperature of eggshell membrane on the decolorization of eosin B was studied. Time for adsorption to reach equilibrium is 100 min. Optimum pH value is 2.0 for the adsorption. And the amount of dye removed by egg shell membrane was increasing as temperature ascending. At room temperature and optimum conditions, 95% of eosin B could be removed and maximum adsorption of 40.9 mg/g had been achieved. The adsorption behavior of eggshell membrane towards eosin B fit well with Freundlich isotherm.
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7

Ramadhan, Kharisma Panji, Sita Heris Anita, Maulida Oktaviani, Fahriya Puspita Sari, Raden Permana Budi Laksana, Oktan Dwi Nurhayat, and Dede Heri Yuli Yanto. "Biodecolorization of Anthraquinone and Azo Dyes by Newly Isolated Indonesian White-Rot Fungi." Biosaintifika: Journal of Biology & Biology Education 13, no. 1 (April 10, 2021): 16–25. http://dx.doi.org/10.15294/biosaintifika.v13i1.26148.

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Water pollution by dyes represents from dyestuff industry becomes an environmental concern. Finding new isolates capable of decolorizing these dyes is important. The study aimed to assess the new isolates of white-rot fungi (WRF) as decolorizing agent of anthraquinone and azo dyes. Decolorization assay were conducted in Agar plates and liquid medium. During the decolorization, laccase activities produced by the fungal strains were analyzed. Identification of the fungal strains were investigated using molecular DNA analysis. The results showed that isolates M3, H18, and GP1 were able to decolorize anthraquinone and azo dyes in Agar and liquid medium. Based on DNA analysis, isolates M3, H18, and GP1 have the similarity to Trametes sanguinea, Trametes polyzona, and Neofomitella guangxiensis, respectively. Among the fungi, T. polyzona H18 exhibited high decolorization ability (70–90%) to the dyes (100 mg/L) after 96-hours incubation. Laccase activity was fluctuated during the reactions with tendency to increase at the beginning until its peak, then decreased at the end of incubation. This study demonstrated the potential of the new isolates from Indonesia to decolorize anthraquinone and azo dyes. The results of the study can provide an alteranative for bioremediation agents of contaminated water by synthetic dyes.
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Khezrianjoo, Sajjad, Jechan Lee, Ki-Hyun Kim, and Vanish Kumar. "Eco-Toxicological and Kinetic Evaluation of TiO2 and ZnO Nanophotocatalysts in Degradation of Organic Dye." Catalysts 9, no. 10 (October 21, 2019): 871. http://dx.doi.org/10.3390/catal9100871.

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In this study, the photocatalytic degradation of azo dye “Food Black 1” (FB1) was investigated using TiO2 and ZnO nanoparticles under ultraviolet (UV) light. The performances of the two photocatalysts were evaluated in terms of key parameters (e.g., decolorization, dearomatization, mineralization, and detoxification of dye) in relation to variables including pre-adsorption period, pH, and temperature. Under acidic conditions (pH 5), the ZnO catalyst underwent photocorrosion to increase the concentration of zinc ions in the system, thereby increasing the toxic properties of the treated effluent. In contrast, TiO2 efficiently catalyzed the degradation of the dye at pH 5 following the Langmuir–Hinshelwood (L–H) kinetic model. The overall results of this study indicate that the decolorization rate of TiO2 on the target dye was far superior to ZnO (i.e., by 1.5 times) at optimum catalyst loading under UV light.
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Karim, Md Ekramul, Kartik Dhar, Md Moniruzzaman, Mohammad Uzzal Hossain, Keshob Chandra Das, and Md Towhid Hossain. "Decolorization of Synthetic Dyes by Aspergillus flavus Strain EF-3 Isolated from Textile Dyeing Sludge." Bangladesh Journal of Microbiology 37, no. 1 (June 30, 2020): 7–13. http://dx.doi.org/10.3329/bjm.v37i1.51203.

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Treatment of textile and dyeing wastewater using indigenous dye-degrading microorganisms is considered to be a sustainable bioremediation strategy. In the present study, a dye-decolorizing fungal strain was isolated from dyeing sludge and identified as Aspergillus flavus strain EF-3 on the basis of cultural, morphological and internal transcribed spacer (ITS) region sequencing. The fungal strain was tested to decolorize five commercially available textile reactive dyes and dye mixture as well. The decolorization efficiencies were ranged from 62% to 100% for 100 mg/L concentration of each dye in Czapek Dox broth within 6 days of incubation at 27°C, and 120 rpm batch-culture conditions. The dyes Novacron Brilliant Blue FN-R, Bezema Yellow S8-G and dye mixture were completely decolorized within the stipulated time period. The nature of decolorization was found to be co-metabolic, i.e., dyes were not used as the sole source of energy for fungal growth and required an external co-substrate, sucrose for induction of decolorization process. The dye removal mechanism involves initial biosorption of the dye in fungal mycelium followed by subsequent biodegradation to colorless end-product. The findings of the present study provide valuable insights to desgin effective biological treatment for dyeing wastewater using the fungus Aspergillus flavus. Bangladesh J Microbiol, Volume 37 Number 1 June 2020, pp 7-13
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10

Fleischmann, Carolin, Hendrik Wöhlk, and Helmut Ritter. "End group functionalization of poly(ethylene glycol) with phenolphthalein: towards star-shaped polymers based on supramolecular interactions." Beilstein Journal of Organic Chemistry 10 (September 25, 2014): 2263–69. http://dx.doi.org/10.3762/bjoc.10.235.

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The synthesis of a new phenolphthalein azide derivative, which can be easily utilized in polymer analogous reactions, is presented. The subsequent cycloaddition reaction with propargyl-functionalized methoxypoly(ethylene glycol) yielded polymers bearing phenolphthalein as the covalently attached end group. In presence of per-β-cyclodextrin-dipentaerythritol, the formation of stable inclusion complexes was observed, representing an interesting approach towards the formation of star shaped polymers. The decolorization of a basic polymer solution caused by the complexation was of great advantage since this behavior enabled following the complex formation by UV–vis spectroscopy and even the naked eye.
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Dissertations / Theses on the topic "Decolorization. eng"

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Almeida, Ana Carolina Maganha de. "Estudo da biodegradação de corantes azóicos por inóculo proveniente de biodigestor anaeróbio de alimentos /." Rio Claro : [s.n.], 2008. http://hdl.handle.net/11449/94980.

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Orientador: Carlos Renato Corso
Banca: Sandra Mara Martins Franchetti
Banca: Sandra Regina Ceccato Antonini
Resumo: O uso de biodigestores anaeróbios é uma versátil alternativa para produção de biomassa microbiana a partir de resíduos orgânicos. O reaproveitamento das sobras alimentares, produzidas pelo Restaurante Universitário da Unesp Campus Rio Claro, foi o responsável pela produção de um Inóculo Líquido Residual (I.L.R.) utilizado como agente biodegradador e biossorvente para os corantes azóicos "Acid Yellow 25" e "Direct Violet 51" de importante destaque industrial. O projeto dividiu-se em duas etapas, a primeira contemplando a produção do inóculo em grande escala (biodigestor de fluxo contínuo) e a segunda em escala de laboratorial (biodigestor em batelada). Os resultados da análise microbiológica revelaram a presença predominante de bactérias acidogênicas e de leveduras em menor escala. Estes microrganismos foram aplicados como inóculo nas soluções dos dois corantes em condições variadas de pH (2,50; 4,50 e 6,50). A análise dos produtos formados a partir da interação com o I.L.R demonstraram as potencialidades biodegradativas e biossorventes do consórcio microbiano e sua ação diferenciada de acordo com a mudança de pH.As aminas aromáticas e sulfonadas, formadas após a redução da ligação azóica, foram estudada a partir do sobrenadante dos tratamentos dos corantes através do uso dos métodos difundidos do UV-Vis e do HPLC aliados às analises vanguardistas do FTIR.
Abstract: The use of anaerobic bioreactor is a versatile alternative for the production of microbial biomass from organic waste. The reuse of the leftovers from the University Restaurant of Unesp Rio Claro Campus, was responsible for producing a Residual Liquid Inoculum (R.L.I.) used as a biodegradator and biosorptive agent for two azo dyes Acid Yellow 25 and Direct Violet 51 with a major role in the industrial scenery. The project was divided in two steps, the first covering the production of the inoculum in large scale (continuous flow bioreactor) and the second in bench-scale (in-batch bioreactor) The results of the microbiological analysis revealed a predominant presence of acidogenic bacteria and a few yeasts. These microorganisms were used as inoculum in both dye solutions at different pH conditions (2.50, 4.50 and 6.50) The analysis of the resultant by-products demonstrated the biodegradation and biosorptive potential of the consortium and its differentiated pH-regulated action. The aromatic sulfonated amines, formed after the reduction of the azoic bounds, were studied through the spreaded analytic methods of UV-Vis and HPLC in conjunct with the vanguard of FTIR device.
Mestre
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Book chapters on the topic "Decolorization. eng"

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Tischler, Dirk, Jingxian Qi, Anna Christina R. Ngo, and Michael Schlömann. "Microbial Degradation of Azo Dyes." In Biotechnology, 1867–97. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8903-7.ch076.

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Azo dyes are considered as xenobiotic compounds, which are often recalcitrant to be biodegraded. Many dyes are relevant for staining in industries, especially textile and food related. Among other environmental problems, one obvious issue is the coloring effect on effluents from industrial sites and thus the release of xenobiotics into nature. Microorganisms (algae, fungi, yeast, and bacteria) have been found to decolorize a number of azo dyes. Decolorization of azo dyes by microbial cultures is summarized and this is mostly linked to initial activation or even cleavage of the azo bond (e.g., by azoreductases). However, it does not necessarily mean that the compound is degraded to non-toxic products. Various mechanisms of microbial decolorization processes were discovered, including adsorption, enzymatic degradation, or a combination of both. Oxidases and reductases were found to be involved, which contain azoreductase, lignin peroxidase, Mn peroxidase, laccase, tyrosinase, and so on. A focus is on the azoreductases including classification, activity, and applicability.
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Tischler, Dirk, Jingxian Qi, Anna Christina R. Ngo, and Michael Schlömann. "Microbial Degradation of Azo Dyes." In Handbook of Research on Microbial Tools for Environmental Waste Management, 341–71. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3540-9.ch016.

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Azo dyes are considered as xenobiotic compounds, which are often recalcitrant to be biodegraded. Many dyes are relevant for staining in industries, especially textile and food related. Among other environmental problems, one obvious issue is the coloring effect on effluents from industrial sites and thus the release of xenobiotics into nature. Microorganisms (algae, fungi, yeast, and bacteria) have been found to decolorize a number of azo dyes. Decolorization of azo dyes by microbial cultures is summarized and this is mostly linked to initial activation or even cleavage of the azo bond (e.g., by azoreductases). However, it does not necessarily mean that the compound is degraded to non-toxic products. Various mechanisms of microbial decolorization processes were discovered, including adsorption, enzymatic degradation, or a combination of both. Oxidases and reductases were found to be involved, which contain azoreductase, lignin peroxidase, Mn peroxidase, laccase, tyrosinase, and so on. A focus is on the azoreductases including classification, activity, and applicability.
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