Bibliografías temáticas / Dye decolorization

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Literatura académica sobre el tema "Dye decolorization"

Autor: Grafiati
Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Dye decolorization"

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Kaur, Baljinder, Balvir Kumar, Neena Garg y Navneet Kaur. "Statistical Optimization of Conditions for Decolorization of Synthetic Dyes byCordyceps militarisMTCC 3936 Using RSM". BioMed Research International 2015 (2015): 1–17. http://dx.doi.org/10.1155/2015/536745.

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In the present study, the biobleaching potential of white rot fungusCordyceps militarisMTCC3936 was investigated. For preliminary screening, decolorization properties ofC. militariswere comparatively studied using whole cells in agar-based and liquid culture systems. Preliminary investigation in liquid culture systems revealed 100% decolorization achieved within 3 days of incubation for reactive yellow 18, 6 days for reactive red 31, 7 days for reactive black 8, and 11 days for reactive green 19 and reactive red 74. RSM was further used to study the effect of three independent variables such as pH, incubation time, and concentration of dye on decolorization properties of cell free supernatant ofC. militaris. RSM based statistical analysis revealed that dye decolorization by cell free supernatants ofC. militarisis more efficient than whole cell based system. The optimized conditions for decolorization of synthetic dyes were identified as dye concentration of 300 ppm, incubation time of 48 h, and optimal pH value as 5.5, except for reactive red 31 (for which the model was nonsignificant). The maximum dye decolorizations achieved under optimized conditions for reactive yellow 18, reactive green 19, reactive red 74, and reactive black 8 were 73.07, 65.36, 55.37, and 68.59%, respectively.
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Afiya, Hamisu, Erkurt Emrah Ahmet y 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, n.º 1 (27 de enero de 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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Ulfimaturahmah, Fitria Ayudi, Ratna Stia Dewi y Ajeng Arum Sari. "Aspergillus sp. For Indigosol Blue and Remazol Brilliant Blue R Decolorization". BioEksakta : Jurnal Ilmiah Biologi Unsoed 2, n.º 3 (23 de diciembre de 2020): 435. http://dx.doi.org/10.20884/1.bioe.2020.2.3.1795.

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Synthetic dyes are artificial dyes manufactured by Industry and commonly used for the textile industry. These dyes had potentially caused an environmental problem. Many types of dyes are recalcitrant and have toxic properties for living organisms. It can be removed by decolorization method, especially a biological decolorization by fungi. Fungi were chosen due to the ability to degrade toxic components. Aspergillus sp. is the fungi which commonly used for dye decolorization. It might be caused that Aspergillus sp. is one type of fungi lived in the textile waste and expected not to die in the dye decolorization treatment. The purpose of this research was to investigate the ability of the mycelia pellets of Aspergillus sp to decolorized Indigosol Blue dye and Remazol Brilliant Blue R (RBBR) dye. This research showed that mycelial pellets of Aspergillus sp. had high activity of decolorization of Indigosol Blue dye up to 85.37% and RBBR dye up to 80.21% and caused low pH value after 24 hour incubation time compared to the control solution.
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Kumar, Dr Jitender y Navleen Kaur Chopra. "Microbial Decolorization of Leather Dye Effluent". International Journal of Trend in Scientific Research and Development Volume-1, Issue-5 (31 de agosto de 2017): 1029–33. http://dx.doi.org/10.31142/ijtsrd2405.

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Kumar, Dr Jitender. "Decolorization of Textile Dye- Malachite Green". International Journal of Trend in Scientific Research and Development Volume-1, Issue-5 (31 de agosto de 2017): 1211–15. http://dx.doi.org/10.31142/ijtsrd2435.

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Zeng, Jian Zhong, Jun Yue Lin, Song Zhou, Xiu Guang Yi y Shi Sheng Zeng. "Decolorization Effect of Mycelium Pellet on Saline Azo Dye Wastewater". Applied Mechanics and Materials 130-134 (octubre de 2011): 3784–87. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3784.

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A fungus with efficient dye decolorization and that generates a microbial flocculation agent was isolated from a wastewater environment and screened. This bacterial strain imposed a significant decolorization effect on azo dyes. On the basis of morphological and microscopic features, the fungus was identified and named A-6. The results show that the decolorization process of the fungus exhibited two types of actions: adsorption decolorization of mycelium and flocculated decolorization of extracellular products in the dyes. The decolorization ratio reached 99.20%
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Beyhill, M. I., R. D. Matthews y S. G. Pavlostathis. "Decolorization of a reactive copper-phthalocyanine dye under methanogenic conditions". Water Science and Technology 43, n.º 2 (1 de enero de 2001): 333–40. http://dx.doi.org/10.2166/wst.2001.0108.

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The objective of this research was to assess the biological decolorization of the copper-phthalocyanine dye Reactive Blue 7 (RB7) under methanogenic conditions using a mixed, methanogenic culture in a repetitive dye addition batch assay. The initial rate of decolorization was 13.2 mg/L-d and 5.7 mg/L-d for the first and second dye addition, respectively. For an initial RB7 concentration of ca. 300 mg/L, the extent of decolorization remained constant (about 62%) for each repetitive RB7 addition and resulted in a residual color build up. Declining absorbance ratio values (A664/A620) with increasing incubation time confirmed that the observed color removal was due to transformation as opposed to adsorption on the biomass. Chemical decolorization assays using sodium dithionite as the reducing agent resulted in similar absorbance spectra to that obtained after biological decolorization. In addition, in both the chemical and biological decolorization assays, partial oxidation of the reduced dye solution upon exposure to air resulted in higher residual color, indicating that the reduction and decolorization of RB7 are partially reversible. These results also suggest that RB7 reduction and decolorization both chemically and biologically most likely followed a similar reduction mechanism.
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Fadhil, Baseem H. y Atheer M. Ghalib. "ELECTROCHEMICAL DECOLORIZATION OF DIRECT BLACK TEXTILE DYE WASTEWATER". Journal of Engineering 17, n.º 03 (1 de junio de 2011): 441–47. http://dx.doi.org/10.31026/j.eng.2011.03.07.

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Electrochemical decolorization of direct black textile dye was studied in the presence of sodiumhydroxide (NaCl). Electrochemical cell occupy about 1 liter of working electrolyte supplied with graphiteelectrodes for both anode and cathode was constructed for this purpose. Decolorization percent, treatment time, power consumption, and pH were studied as a function of the applied voltage and salt concentration. Results show that decolorization increase with increasing salt concentration and applied voltage. Best decolorization of 86% can be achieved after 17 min at 7 volt and 5 g/l salt concentration. Further decolorization can be achieved but this will be accompanied with a sharp increase in power consumption. No significant decrease in pH value was observed at the end of each experiment.
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Chmelová, Daniela y Miroslav Ondrejovič. "Effect Of Metal Ions On Triphenylmethane Dye Decolorization By Laccase From Trametes Versicolor". Nova Biotechnologica et Chimica 14, n.º 2 (1 de diciembre de 2015): 191–200. http://dx.doi.org/10.1515/nbec-2015-0026.

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Abstract The aim of this study was investigate the influence of different metal ions on laccase activity and triphenylmethane dye decolorization by laccase from white-rot fungus Trametes versicolor. Laccase activity was inhibited by monovalent ions (Li+, Na+, K+ and Ag+) but the presence of divalent ions increased laccase activity at the concentration of 10 mmol/l. The effect of metal ions on decolorization of triphenylmethane dyes with different structures namely Bromochlorophenol Blue, Bromophenol Blue, Bromocresol Blue and Phenol Red was tested. The presence of metal ions (Na+, K+, Mg2+, Ca2+, Ba2+, Mn2+, Zn2+) slightly decreased triphenylmethane dye decolorization by laccase from T. versicolor except Na+ and Mg2+, which caused the increase of decolorization for all tested dyes. Decolorization of selected dyes showed that the presence of low-molecular-weight compounds is necessary for effective decolorization. Hydroxybenzotriazole (HBT) is the most frequently used. Although HBT belongs to most frequently used redox mediator and generally increase decolorization efficiency, so its presence decreased decolorization percentage of Bromophenol Blue and Bromochlorophenol Blue, the influence of metal ions to dye decolorization by laccase has the similar course with or without presence of redox mediator HBT.
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Ramachandran, Palanivelan, Ayyasamy Pudukkadu Munusamy y Ramya Suseenthar. "Decolorization of Textile Dye by Brevibacillus laterosporus (TS5) and Influencing Factors Optimization through Response Surface Methodology". Archives of Ecotoxicology 2, n.º 3 (30 de septiembre de 2020): 51–60. http://dx.doi.org/10.36547/ae.2020.2.3.51-60.

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The dye removal bacteria Brevibacillus laterosporus (TS5) was isolated from dye contaminated soil, and it’s identified by 16S rDNA sequencing method. The prospective bacterial strain exhibited a highest decolorization (97.8%) in Luria-Bertani broth medium. Among the operational factors, Plackett-Burman design, experimental results indicated that pH, incubation period, and yeast extract significantly contributed for the dye decolorization. Also, dye concentration, starch, temperature, and inoculum size noted as insignificant factors on dye decolorization. Central composite design applied for optimization of important factors to enhance the dye decolorization by Brevibacillus laterosporus (TS5). The optimal values of significant factors were determined by the Response surface methodology (RSM) as follows: 0.60% (w/v) yeast extract, 7.23 pH and 61.45 hrs incubation period, which assisted for Brevibacillus laterosporus (TS5) to attain 90.66% dye removal. Brevibacillus laterosporus (TS5) showed 90.08% decolorization in validation experiments by the support of optimal factors, and implies that explored strain could be a suitable candidate for bioremediation of dye containing effluents.
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Tesis sobre el tema "Dye decolorization"

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Kamat, Rohit Babli. "Phytoremediation for dye decolorization". Diss., Kansas State University, 2014. http://hdl.handle.net/2097/17548.

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Doctor of Philosophy
Department of Biochemistry and Molecular Biophysics
Lawrence C. Davis
Synthetic dyes are capable of producing the whole color spectrum on account of their structural diversity but this diversity poses challenges in the degradation of dyeing wastes. Laccases and peroxidases from bacterial or fungal sources and parts of plants in the presence of hydrogen peroxide (H₂O₂) plus a mediator have been exploited in the bioremediation of synthetic dyes. However, intact plants have not found much favor despite their phytoremediation potential. The goal of this research was to further clarify ways by which whole plants bring about decolorization of different types of synthetic dyes. Hydroponically cultivated plants from two dicot families namely Arabidopsis thaliana and sunflowers (Helianthus annuus) were exposed to representative dyes from several classes: monoazo (Methyl Red and Methyl Orange), disazo (Trypan Blue, Evans Blue and Chicago Blue 6B), and arylmethane (Brilliant Blue G, Bromocresol Green, Malachite Green and Phenol Red). Tests were done in presence or absence of externally added H₂O₂, with or without a free radical mediator, 1-hydroxybenzotriazole, using UV-Visible spectrophotometry. The initial rate of decolorization and the overall percentage decolorization was calculated for each dye in the different treatments. Decolorization of the dyes from different classes varied between plant species and depending on the treatment. Except for Methyl Red, all dyes required added H₂O₂ as well as mediator to achieve rapid decolorization. Added H₂O₂ was found to be the limiting factor since it was degraded by plants within a few hours. Both species were able to slowly decolorize dyes upon daily addition of fresh dye even in the absence of added H₂O₂ and mediator, provided that nutrients were supplied to the plants with the dye. A. thaliana was found to be more effective in dye decolorization per gram tissue than sunflower when treated under similar conditions. Analysis of the residual dye solution by ESI/MS did not reveal any potential by-products following the decolorization treatment with plants, suggesting that the plant roots might be trapping the by-products of dye decolorization and preventing their release into the solution. All these findings support the potential application of whole plants for larger scale remediation.
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Yang, Hanbae. "Zero-Valent Iron Decolorization of the Anthraquinone Dye Reactive Blue 4 and Biodegradation Assessment of its Decolorization Products". Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6920.

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Anthraquinone dyes constitute the second largest class of textile dyes, and are used extensively in the textile industry. A high fraction of the initial reactive dye mass used in the dyeing process remains in the spent dyebath. Reactive dyes are not readily removed by typical wastewater treatment processes and the high salt concentration typical of reactive dyeing further complicates the management of spent reactive dyebaths. Investigation of the reductive transformation of reactive anthraquinone dyes and their decolorization products has been very limited. Additionally, very limited research has been conducted on the decolorization of spent reactive dyebaths. Research was conducted to investigate the key operational parameters of batch and continuous-flow ZVI decolorization of a reactive anthraquinone dye, Reactive Blue 4 (RB4), under anoxic conditions, as well as the potential for the biodegradation of its decolorization products in a halophilic culture under aerobic conditions. The effect of two operational parameters, such as mixing intensity and initial dye concentration, on the ZVI batch decolorization kinetics indicates that ZVI decolorization of RB4 is a surface-catalyzed, mass transfer-limited process. The high salt and base concentrations enhanced the rate of RB4 decolorization. Based on parameters such as porosity, hydraulic conductivity, pore water velocity, and dispersion coefficient, non-ideal transport characteristics were observed in a continuous-flow ZVI column. The results of a long-term continuous-flow ZVI decolorization kinetics demonstrated that continuous-flow ZVI decolorization is feasible. However, column porosity losses and a shift of reaction kinetics occur in long-term column operation. ZVI decolorization of RB4 was successfully described with a pseudo first-order or a site saturation model. Lastly, the RB4 decolorization products generated by ZVI treatment had no inhibitory effect on the halophilic culture. However, biodegradation and/or mineralization of RB4 decolorization products was not observed after a long-term incubation of the culture. This research demonstrated the feasibility of ZVI decolorization of reactive anthraquinone dyes, which will help in the development of a continuous-flow, dyebath decolorization process and the possible reuse of the renovated dyebath in the dyeing operation. Such a system could lead to substantial reduction of water usage, as well as a decrease of salt and dye discharges.
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Duygulu, Yusuf Bahadir. "Decolorization Of Synthetic Dye Solutions By Using Basaltic Tephra And Clinoptilolite". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605241/index.pdf.

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Discharge of colored effluents without decoloration originated from textile industries may cause serious problems in the receiving environments. In this study, natural materials that are basaltic tephra and clinoptilolite were used to remove various dyestuffs used in the textile industry. Those materials are cheap and available in large quantities in Turkey. The investigation of adsorption of basic, acidic and reactive dyes on these materials is the objective of this study. During preliminary experiments it was seen that adsorption equilibrium was reached in about 2 days. In adsorption experiments, in order to obtain adsorption isotherms, a fixed amount of adsorbent and 100 mL dye solutions of different concentrations were placed in glass bottles which were shaken at 200 rpm and 25±
2oC for 2 days. Then, samples were filtered and the equilibrium concentrations of dyestuffs in the solutions were determined by using spectrophotometer at appropriate wavelength corresponding to the maximum absorbency. After equilibrium concentrations of the solutions were obtained, Langmuir and Freundlich adsorption isotherm constants were calculated for the adsorbents used in this study. The removal efficiencies for cationic basic dyes are higher than those for anionic acidic and reactive dyes with the natural materials. Therefore, modification of surface properties of natural materials with a cationic surfactant was considered to increase the removal efficiencies of those for anionic dyes. After modification of the surface properties, adsorption capacities of adsorbents for anionic dyes were higher than those of natural materials. Finally, the adsorption capacity of activated carbon for the same dyes was determined to compare with that of natural and modified materials. The results showed that the adsorption of dyes on adsorbents used in this study fitted nicely the Langmuir Isotherm Equations.
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Iseppi, Daniela <1987&gt. "Chemometric analysis of the photooxidative decolorization of the azo dye Acid Red 97". Master's Degree Thesis, Università Ca' Foscari Venezia, 2012. http://hdl.handle.net/10579/1512.

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Dykstra, Christine M. "Decolorization of an azo and anthraquinone textile dye by a mixture of living and non-living Trametes versicolor fungus". Honors in the Major Thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/375.

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Wastewater from the textile industry is difficult to treat effectively due to the prevalent use and wide variety of synthetic dyes that are resistant to conventional treatment methods. White-rot fungi, such as Trametes versicolor, have been found to be effective in decolorizing many of these synthetic dyes and current research is focusing on their application to wastewater treatment. Although numerous studies have been conducted on the ability of both living and nonliving Trametes versicolor to separately decolorize textile dyes, no studies were found to have investigated the use of a mixture of live and dead fungus for decolorization. This study explored potential interactions between live and dead, autoclaved Trametes versicolor biomass in a mixed system by utilizing a series of batch tests with two structurally different synthetic textile dyes. Samples were analyzed by spectrophotometer and compared with controls to determine the effect of any interactions on decolorization. The results of this study indicate that an interaction between living and nonliving biomass occurred that affected the specific dye removal for both Reactive Blue 19, an anthraquinone textile dye, and Reactive Orange 16, an azo textile dye. This interaction was seen to improve the specific dye removal during the first 10-46 hours of experimentation but then diminish the specific dye removal after this period. This effect could be due to hydrophobins, which are surface-active proteins excreted by live fungi that may alter hydrophobicity. Additionally, the presence of adsorptive dead biomass could affect dye contact with degrading enzymes released from the live fungus. By expanding current knowledge of the interactions that take place in a fungal bioreactor and their effect on textile dye decolorization, this research aims to inspire more effective and less costly bioreactor designs for the treatment of textile wastewater.
B.S.Env.E.
Bachelors
Engineering and Computer Science
Environmental Engineering
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Ribeiro, Jefferson Pereira. "Estudo da OtimizaÃÃo do Processo H2O2/UV para degradaÃÃo do Corante Remazol Vermelho RB 133%". Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6525.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico
As atividades industriais que consomem excesso de Ãgua no seu processo industrial, geralmente geram um elevado volume de efluentes, onde a indÃstria tÃxtil à um exemplo tÃpico. A oxidaÃÃo quÃmica à um dos processos alternativos para o tratamento de efluentes contendo corantes tÃxteis, entre eles destacam-se os POAs que sÃo baseados na geraÃÃo de radicais hidroxilas (.OH) no qual sÃo altamente oxidantes, podendo decompor compostos de maneira rÃpida e nÃo-seletiva, conduzindo a mineralizaÃÃo parcial ou completa do contaminante. O presente trabalho estudou o uso de processo oxidativo avanÃado para a degradaÃÃo do corante Remazol Vermelho RB 133%. Os estudos foram realizados em duas etapas. Na primeira etapa, no reator com 710 mL de volume Ãtil, foram realizados estudos de otimizaÃÃo dos parÃmetros: cinÃtica de descoloraÃÃo, dosagem do perÃxido de hidrogÃnio, pH, temperatura, adiÃÃo de perÃxido de hidrogÃnio em linha. A cinÃtica de descoloraÃÃo, e o efeito inibitÃrio de Ãnions tambÃm foram estudados. O estudo de cinÃtica mostrou que em 250 minutos houve uma descoloraÃÃo completa da soluÃÃo usando uma dosagem de perÃxido de hidrogÃnio de 1% H2O2 mediante o uso da radiaÃÃo UV. Nestas condiÃÃes houve uma remoÃÃo de 78,41% na DQO. O pH nÃo influenciou no processo de descoloraÃÃo da soluÃÃo, em contraste, para valores de pH iniciais 8 e 10 houve uma maior remoÃÃo na DQO. O estudo do efeito da temperatura do sistema mostrou que com o aumento temperatura a velocidade de descoloraÃÃo à pouco influenciada, ao passo que o aumento da temperatura (80ÂC) diminuiu a eficiÃncia do processo de remoÃÃo da DQO. A adiÃÃo de H2O2 em linha do processo aumentou a eficiÃncia na remoÃÃo de DQO. Os resultados das eficiÃncias de remoÃÃo ao final do processo indicaram que nÃo houve diferenÃa entre os tratamentos na presenÃa dos Ãnions na concentraÃÃo estudada (10 mM) quando comparada a degradaÃÃo sem a presenÃa desses Ãnions, pois ao final de todos os tratamentos a soluÃÃo ficou incolor. Na segunda etapa, no reator com 520 mL de volume Ãtil, foram realizados estudos de vazÃo e potÃncia de radiaÃÃo UV. O estudo mostrou que para as vazÃes estudadas 1,0; 2,0 e 3,0 L/min nÃo houve uma X diferenÃa significativa no processo de descoloraÃÃo. As concentraÃÃes da matÃria orgÃnica ao final de 480 minutos de experimento para as trÃs vazÃes foram 36,63%; 51,08% e 48,35%, respectivamente. O aumento da potÃncia de radiaÃÃo UV proporcionou um aumento na eficiÃncia do processo de descoloraÃÃo e degradaÃÃo da matÃria orgÃnica. O estudo com efluente real mostrou uma baixa eficiÃncia na reduÃÃo de cor e de demanda quÃmica de oxigÃnio.
Industrial processes that consume excess of water, typically generates a high volume of effluent, where the textile industry is a typical example. The oxidation chemistry is one of the alternative processes for the textile dyes treatment. In this context, the Advanced Oxidation Processes (AOPs) are based on the generation of hydroxyl radicals (.OH) on which are highly oxidizing compounds can decompose quickly and non-selective contaminant solutes, for a partial or complete mineralization. This study investigated the use of advanced oxidation process for degradation of the dye Remazol Red RB 133%. The studies were conducted in two stages. For first step, in the reactor with 710 mL of working volume , were studies the parameters: kinetic effect, hydrogen peroxide dosage, temperature, pH, addition of hydrogen peroxide in the line. The kinetics study decolorization and the inhibitory effect of anions were also studied. The study of kinetic showed that in 250 minutes there was a complete decolorization of the solution using a H2O2 dose of 1% (v/v) through the use of UV radiation, and a 78.41% removal in Chemical Oxygen Demand (COD) was observed. The pH effect not influenced in the decolorization process; however has been influenced in removal of COD. The study of temperature effect showed that for an increase in temperature the decolorization rate increases, but a small improvement in the efficiency of COD removal. The addition of H2O2 during the process increased the efficiency of COD removal. The results of the efficiencies of the end of the process indicated that there was no difference between treatments in the presence of anions in the studied concentration (10 mM) when compared to degradation without the presence of these anions, since the end of all treatments, the solution was colorless. In the second stage, was carried in the reactor with 520 mL of working volume flow studies were performed and power of UV radiation. The studies of flow rate showed that for flow rate of 1.0; 2.0 and 3.0 L/min there was no significant difference in the process decolorization process. The of organic matter concentrations at 480 minutes of experiment for the three flow rates were 36.63%, 51.08% and 48.35% respectively. The increased power of UV radiation caused an increase in the XII efficiency of discolouration and degradation of organic matter. The study showed a real effluent with low efficiency to reduce color and chemical oxygen demand.
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Mezohegyi, Gergo. "Catalytic azo dye reduction in advanced anaerobic bioreactors". Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/8593.

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En un reactor anaeróbico de lecho empacado y de flujo ascendente con carbón activado (AC) biológico se obtuvieron altas velocidades de conversión del colorante azoico Acid Orange 7 a tiempos espaciales muy cortos, hasta 99% en 2.0 min. Tanto el área superficial específica como la conductividad electrónica del AC contribuyeron a las mayores velocidades de reducción. La agitación en el lecho de carbón produjo un incremento de la bioconversión del colorante. Se estableció un modelo cinético de decoloración que implica catálisis heterogénea y bioreducción. La biodegradabilidad anaeróbica de un colorante azoico en el sistema reactivo agitado pudo ser predicha a partir de su potencial de reducción. Las velocidades de decoloración fueron significativamente influenciadas por las propiedades texturales del AC y moderadamente afectadas por su química superficial. Este bioreactor catalítico parece ser una alternativa atractiva para la mejora económica de las tecnologías de tratamiento de aguas residuales textiles y de colorantes.
In an anaerobic upflow packed-bed reactor with biological activated carbon (AC), high azo dye Acid Orange 7 conversion rates were achieved during very short space times up to 99% in 2.0 min. Both electron conductivity and specific surface area of AC contributed to higher reduction rates. The application of stirring in the carbon bed resulted in an increase of dye bioconversion. A decolourisation model was developed involving both heterogeneous catalysis and bioreduction. The anaerobic biodegradability of an azo dye could be predicted by its reduction potential in the stirred reactor system. The decolourisation rates were found to be significantly influenced by the textural properties of AC and moderately affected by its surface chemistry. This catalytic bioreactor system seems to be an attractive alternative for economically improving textile/dye wastewater technologies.
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Yang, Fangfang. "Targeted supported laccase based hybrid catalyst for continuous flow catalysis". Electronic Thesis or Diss., Ecole centrale de Marseille, 2021. http://www.theses.fr/2021ECDM0009.

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Les catalyseurs hétérogènes sont aujourd’hui'hui largement développés afin d'obtenir une meilleure stabilité, une meilleure réutilisation ainsi qu'une meilleure localisation. Dans cette optique, nous avons d'abord préparé des catalyseurs hétérogènes à base d'enzymes par l'immobilisation d’une laccase d'origine fongique contenant seulement deux lysines de surface spatialement proches (K40, K71) ainsi que deux de ses variants contenant une lysine unique -une située à proximité du site d'oxydation du substrat (K157) et une à l'opposé de ce site d'oxydation (K71)- dans des mousses de silice de type Si(HIPE) à porosités contrôlées. L'immobilisation a été réalisée par liaison covalente entre l'enzyme et la mousse activée à faible teneur en glutaraldéhyde. En testant la décoloration de colorants dans un réacteur à flux continu, nous montrons que l'activité du catalyseur hétérogène est comparable à son homologue homogène. Son activité opérationnelle reste aussi élevée que 60 % après douze cycles de décoloration consécutifs et un an de stockage. Plus important encore, en comparant les activités sur différents substrats pour des catalyseurs orientés différemment, nous montrons une discrimination double pour l'ABTS par rapport à l'ascorbate. Par ailleurs, les métalloenzymes artificielles peuvent utiliser les avantages des catalyseurs métalliques et enzymatiques pour réaliser une oxydation aérobie de manière durable. Nous avons donc immobilisé un complexe Pd(II) à base de biquinoline et une laccase dans des monolithes de silice pour l'oxydation de l'alcool veratrylique. Afin de contrôler la réactivité, trois méthodes d'immobilisation ont été utilisées pour la construction de ces catalyseurs hybrides hétérogènes. Les catalyseurs hybrides immobilisés présentent une activité améliorée par rapport au complexe de Pd immobilisé seul pour chaque méthode testée, attestant de la synergie entre le Pd et la laccase. En modulant l'orientation de l'enzyme vers le complexe de Pd(II) et la mousse de silice, nous montrons que l'activité de l'hybride de Pd(II)/UNIK157 est en moyenne deux fois plus importante que celle de Pd(II)/UNIK71. Une bonne stabilité et réutilisation est observée quel que soit l'orientation de l'enzyme. Cette étude donne un aperçu de l'utilisation de supports solides qui au-delà de permettre la stabilité et la réutilisation deviennent des partenaires synergiques dans le processus catalytique
Heterogeneous catalysts are now widely developed to obtain improved stability, reusability, and localization. In this view, we first prepared the enzyme-based heterogeneous catalysts by the immobilization of a fungal laccase containing only two spatially close surface lysines (K40, K71) and its variants containing a unique lysine -one located in the vicinity of the substrate oxidation site (K157) and one at the opposite side of this oxidation site (K71)- into Si(HIPE) type silica foams bearing controlled porosities. Immobilization was achieved by a covalent bond forming reaction between the enzyme and the low glutaraldehyde activated foam. Testing dye decolorization in a continuous flow reactor, we show that the activity of the heterogeneous catalyst is comparable to its homogeneous counterpart. Its operational activity remains as high as 60 % after twelve consecutive decolorization cycles and one-year storage. More importantly, comparing activities on different substrates for differentially oriented catalysts, we show a two-fold discrimination for ABTS relative to ascorbate. In addition, artificial metalloenzymes can use the advantages of both metallic and enzymatic catalysts to perform aerobic oxidation in a sustainable fashion. We thus co-immobilized a biquinoline-based-Pd(II) complex and laccase into silica monoliths for veratryl alcohol oxidation. To address the control of reactivity, three methods of immobilization were used for the construction of the heterogeneous hybrid catalysts. The immobilized hybrid catalysts show an improved activity compared to the immobilized Pd complex alone for each tested method, attesting for the synergy between Pd and laccase. By tuning enzyme orientation towards Pd(II) complex and silica foam, we show that the activity of the Pd(II)/UNIK157 hybrid exhibits an averaged two-fold increase compared to Pd(II)/UNIK71. A good stability and reusability is observed for both enzyme orientations. This study provides insights into the use of solid supports that beyond allowing stability and reusability becomes synergistic partners in the catalytic process
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Matthews, Rosalyn D. "Transformation and decolorization of reactive phthalocyanine". Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04062004-164728/unrestricted/matthews%5Frosalyn%5Fd%5F200312%5Fphd.pdf.

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Thesis (Ph. D.)--School of Civil and Environmental Engineering, Georgia Institute of Technology, 2004. Directed by Spyros G. Pavlostathis.
Vita. Includes bibliographical references (leaves 381-393).
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Beydilli, Mumtaz Inan. "Reductive biotransformation and decolorization of reactive azo dyes". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/21451.

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Libros sobre el tema "Dye decolorization"

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Singh, Ram Lakhan, Rajat Pratap Singh y Pradeep Kumar Singh. Recent Advances in Decolorization and Degradation of Dyes in Textile Effluent by Biological Approaches. Taylor & Francis Group, 2019.

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Recent Advances in Decolorization and Degradation of Dyes in Textile Effluent by Biological Approaches. Taylor & Francis Group, 2019.

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Singh, Ram Lakhan, Rajat Pratap Singh y Pradeep Kumar Singh. Recent Advances in Decolorization and Degradation of Dyes in Textile Effluent by Biological Approaches. Taylor & Francis Group, 2019.

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Singh, Ram Lakhan, Rajat Pratap Singh y Pradeep Kumar Singh. Recent Advances in Decolorization and Degradation of Dyes in Textile Effluent by Biological Approaches. Taylor & Francis Group, 2019.

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Capítulos de libros sobre el tema "Dye decolorization"

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Tochhawng, Lalrokimi, Vineet Kumar Mishra, Ajit Kumar Passari y Bhim Pratap Singh. "Endophytic Fungi: Role in Dye Decolorization". En Advances in Endophytic Fungal Research, 1–15. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-03589-1_1.

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Liu, Guangfei, Jiti Zhou, Jing Wang, Xin Zhang, Bin Dong y Ning Wang. "Reductive Decolorization of Azo Dye by Bacteria". En Microbial Degradation of Synthetic Dyes in Wastewaters, 111–33. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10942-8_5.

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Singh, Anuradha, Arpita Ghosh y Manisha Ghosh Dastidar. "Decolorization of Reactive Yellow 17 Dye Using Aspergillus tamarii". En Environmental Pollution, 309–16. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5792-2_25.

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Chang, Jo-Shu. "Bioprocess Development for Mercury Detoxification and Azo-Dye Decolorization". En ACS Symposium Series, 159–72. Washington, DC: American Chemical Society, 2003. http://dx.doi.org/10.1021/bk-2003-0862.ch010.

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Biswas, Budhodeb y Chanchal Majumder. "Decolorization of Textile Dye RR 141 Using Electrochemical Process". En Springer Proceedings in Earth and Environmental Sciences, 395–403. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37596-5_29.

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Dholakiya, Riddhi Naresh, Madhava Anil Kumar y Kalpana H. Mody. "Streptomyces cavourensis Strain RD7-Mediated Decolorization of Aromatic Industrial Dye". En Water Science and Technology Library, 269–80. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5795-3_23.

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Mukkera, Vamshi Krishna y Srivani Katuri. "Decolorization of Azo Dye-Contaminated Water using Microbes: A Review". En Lecture Notes in Civil Engineering, 821–35. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0304-5_57.

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Poddar, Maneesh Kumar, Priyanka Prabhakar y Hari Mahalingam. "Operational Parameters in Dye Decolorization via Sonochemical and Sonoenzymatic Treatment Processes". En Sustainable Textiles: Production, Processing, Manufacturing & Chemistry, 253–75. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0882-8_9.

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Feng, Wei, Peng Song, Yang Zhang y Zixing Dong. "Stenotrophomonas maltophilia Having Decolorization Capability of Azo Dye Isolated from Anaerobic Sludge". En Lecture Notes in Electrical Engineering, 109–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46318-5_12.

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Mishra, Anu y Bhupendra Singh Butola. "Photocatalytic Decolorization of Rhodamine B Dye Solution Using TiO2 Coated Cotton Fabric". En Functional Textiles and Clothing, 139–50. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7721-1_13.

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Actas de conferencias sobre el tema "Dye decolorization"

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Liang, Huixing, Aihui Chen, Xin Chen, Zhaoxia Li y Cheng Ding. "Isolation of Dye Decolorization Bacteria and the Study on the Conditions of Dyes Decolorization". En 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5518259.

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Zhao, Lihong y Hongjun Sun. "Breeding of high dye-decolorization strain by UV mutagenesis". En 2011 International Conference on Consumer Electronics, Communications and Networks (CECNet). IEEE, 2011. http://dx.doi.org/10.1109/cecnet.2011.5769338.

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Fartode, Anoop P., S. A. Fartode y Tushar R. Shelke. "Radiolytic decolorization study of aqueous solutions of methylene blue dye". En INTERNATIONAL CONFERENCE ON “MULTIDIMENSIONAL ROLE OF BASIC SCIENCE IN ADVANCED TECHNOLOGY” ICMBAT 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5100410.

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Wu, Wen-Tung, Shu-Fen Kuo y Tzu-Hsuan Chien. "Light-emitting diode effect on bacterial decolorization of azo dye". En 2012 2nd International Conference on Consumer Electronics, Communications and Networks (CECNet). IEEE, 2012. http://dx.doi.org/10.1109/cecnet.2012.6202216.

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Omeje, Kingsley O., Chinonso Magbo, Emmanuel C. Ossai, Juliet N. Ozioko, Benjamin O. Ezema, Nonso E. Nnolim y Sabinus O. O. Eze. "Immobilization of Fungal Peroxidase on Paramagnetic Nanoparticles for Synthetic Dye Decolorization". En The 3rd International Online-Conference on Nanomaterials. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/materproc2022009024.

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Krastanov, A., H. Yemendzhiev, I. Stoilova y Z. Alexieva. "Reactive Violet 12 dye decolorization by mycelial culture of Trametes versicolor". En Proceedings of the III International Conference on Environmental, Industrial and Applied Microbiology (BioMicroWorld2009). WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814322119_0053.

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Elkady, M. F., H. Shokry Hassan y A. H. El-Shazly. "Formulation of nano-zinc oxide into biocomposite beads for dye decolorization". En 4TH INTERNATIONAL CONGRESS IN ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE (APMAS 2014). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4914227.

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Sunar, N. M., S. Z. K. Mon, W. A. W. Jusoh, M. K. Musa, M. A. A. Rahman, A. F. H. Zulkifli, M. S. S. Mustafa et al. "Decolorization of coractive red dye by an application of Pseudomonas spp." En 10TH INTERNATIONAL CONFERENCE ON APPLIED SCIENCE AND TECHNOLOGY. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0123769.

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Lou, Chunxia, Te Wang y Linghua Zhang. "PROPERTIES OF LACCASE FROM BACILLUS SP. C2 AND ITS USE IN DYE DECOLORIZATION". En 2016 International Conference on Biotechnology and Medical Science. WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813145870_0016.

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Obaid, Amani J. y Luma M. Ahmed. "TiO2 - Catalyzed photo decolorization of chlorazol black BH dye under UV-A light". En THE 9TH INTERNATIONAL CONFERENCE ON APPLIED SCIENCE AND TECHNOLOGY (ICAST 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0113454.

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