Journal articles: 'Dye decolorization'

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Kaur, Baljinder, Balvir Kumar, Neena Garg, and 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, 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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Ulfimaturahmah, Fitria Ayudi, Ratna Stia Dewi, and Ajeng Arum Sari. "Aspergillus sp. For Indigosol Blue and Remazol Brilliant Blue R Decolorization." BioEksakta : Jurnal Ilmiah Biologi Unsoed 2, no. 3 (December 23, 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, and Navleen Kaur Chopra. "Microbial Decolorization of Leather Dye Effluent." International Journal of Trend in Scientific Research and Development Volume-1, Issue-5 (August 31, 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 (August 31, 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, and Shi Sheng Zeng. "Decolorization Effect of Mycelium Pellet on Saline Azo Dye Wastewater." Applied Mechanics and Materials 130-134 (October 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, and S. G. Pavlostathis. "Decolorization of a reactive copper-phthalocyanine dye under methanogenic conditions." Water Science and Technology 43, no. 2 (January 1, 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., and Atheer M. Ghalib. "ELECTROCHEMICAL DECOLORIZATION OF DIRECT BLACK TEXTILE DYE WASTEWATER." Journal of Engineering 17, no. 03 (June 1, 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, and Miroslav Ondrejovič. "Effect Of Metal Ions On Triphenylmethane Dye Decolorization By Laccase From Trametes Versicolor." Nova Biotechnologica et Chimica 14, no. 2 (December 1, 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, and Ramya Suseenthar. "Decolorization of Textile Dye by Brevibacillus laterosporus (TS5) and Influencing Factors Optimization through Response Surface Methodology." Archives of Ecotoxicology 2, no. 3 (September 30, 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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Wu, Wen Tung, and Ming Der Jean. "Evaluation of Light Irradiation on Decolorization of Azo Dyes by Tsukamurella sp. J8025." Applied Mechanics and Materials 145 (December 2011): 304–8. http://dx.doi.org/10.4028/www.scientific.net/amm.145.304.

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In the previous study, the dye decolorization was investigated byTsukamurellasp. J8025 under the static condition at 30°C. The object of this study was to evaluate the influence of light irradiation with 15W low-pressure mercury lamp on dye decolorization. Three kinds of common culture medium Luria-Bertani (LB), Tryptic Soy Broth (TSB), and Yeast extract-Malt Extract (YEME) were used in this study. Strain J8025 was cultivated in different media added with methyl orange, and the rate of color removal was determined by measuring the absorbance at specific wavelengths. The experiments proved the decolorization efficiency after 48h under light irradiation in LB medium was up to 40%, that in TSB medium was up to 50%, and that in YEME medium was up to 68%, respectively. The decolorization process needed glucose as an energy source to support the bacterial growth and promote the decolorization rate. Due to the salt contained in the dye-wastewater, the effect of salt was investigated. The results showed nearly 98% color was removed after 48 h in the presence of 1% NaCl under light irradiation, but the decolorization was inhibited by high concentrations of salt. The results indicated a strain J8025 coupling with the light irradiation could be potentially used to improve the dye decolorization.

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Parikh, Amit, and Datta Madamwar. "Textile dye decolorization using cyanobacteria." Biotechnology Letters 27, no. 5 (March 2005): 323–26. http://dx.doi.org/10.1007/s10529-005-0691-7.

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Carrière, Julie, J. Peter Jones, and Arthur D. Broadbent. "Decolorization Of Textile Dye Solutions." Ozone: Science & Engineering 15, no. 3 (June 1993): 189–200. http://dx.doi.org/10.1080/01919519308552483.

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Mitrovic, Jelena, Miljana Radovic, Danijela Bojic, Tatjana Andjelkovic, Milovan Purenovic, and Aleksandar Bojic. "Decolorization of textile azo dye reactive orange 16 with UV/H2O2 process." Journal of the Serbian Chemical Society 77, no. 4 (2012): 465–81. http://dx.doi.org/10.2298/jsc110216187m.

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The photochemical decolorization of C.I. Reactive Orange 16 (RO16), a reactive textile azo dye by the UV/H2O2 process using a batch photoreactor with UV lamps emitting at 253.7 nm, was studied. Complete decolorization of 50.0 mg dm-3 initial dye concentration was achieved in less than 6 min under optimal conditions (25 mM initial peroxide concentration, at pH 7.0 and with UV light intensity 1950 ?W cm-2). The effect of experimental variables, such as initial pH, initial concentration of H2O2, initial dye concentration, and the intensity of UV light was studied. The highest decolorization rates were performed at peroxide concentration in range from 20 mM up to 40 mM, above which decolorization was inhibited by a scavenging effect of peroxide. The decolorization was more efficient in neutral pHs. The efficiency of the process was improved in lower initial dye concentration and at higher intensity of UV light.

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Nabeela, Nabeela, Sumera Afzal Khan, Saadat Mehmood, Sohaib Bin Shabbir, Sajid Ali, Abdulwahed Fahad Alrefaei, Mohammed Fahad Albeshr, and Muhammad Hamayun. "Efficacy of Fungi in the Decolorization and Detoxification of Remazol Brilliant Blue Dye in Aquatic Environments." Microorganisms 11, no. 3 (March 9, 2023): 703. http://dx.doi.org/10.3390/microorganisms11030703.

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Industrial effluents result in water pollution and affect the biological activity of aquatic and terrestrial life. In this study, efficient fungal strains were isolated from the aquatic environment and identified as Aspergillus fumigatus (SN8c) and Aspergillus terreus (SN40b). The isolates were selected based on their potential to efficiently decolorize and detoxify Remazol brilliant blue (RBB) dye, which is extensively used in different industries. Initially, a total of 70 different fungal isolates were screened. Among these, 19 isolates demonstrated dye decolorization capabilities, and SN8c and SN40b revealed the highest decolorization capabilities in liquid medium. The maximum estimated decolorization for SN8c was 91.3% and for SN40b, 84.5% at 40 mg/L of RBB dye in the presence of glucose (1 gm/L), after 5 days of incubation at different levels of pH, temperature, nutrient source, and concentration. RBB dye decolorization using SN8c and SN40b isolates was at a maximum of 99% at pH 3–5, whereas minimum decolorization was recorded as 71.29% and 73.4% SN8c, respectively, at pH 11. The maximum decolorization of the dye was 93% and 90.9% in a defined glucose concentration of 1 gm/L, and a 63.01% decrease was recorded in the decolorization activity at a low level of glucose concentration (0.2 gm/L). Finally, the decolorization and degradation were detected using UV spectrometry and HPLC. Toxicity tests of pure dye and treated dye samples were checked against the seed germination of different plants and the larvae mortality of Artemia salina. This study revealed that indigenous aquatic fungal flora can recover contaminated sites and support aquatic and terrestrial life.

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Raman, Chandra Devi, Kanmani Sellappa, and Martin Mkandawire. "Facile one step green synthesis of iron nanoparticles using grape leaves extract: textile dye decolorization and wastewater treatment." Water Science and Technology 83, no. 9 (April 7, 2021): 2242–58. http://dx.doi.org/10.2166/wst.2021.140.

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Abstract The existing knowledge on the reactivity of green iron particles on textile dye and wastewater decolorization is very limited. In this study, the potential of green iron particles synthesized using grape leaves extract on reactive dye (reactive red 195, reactive yellow 145, reactive blue 4 and reactive black 5) decolorization were investigated. 95–98% of decolorization was achieved for all reactive dyes at 1.4–2.0 g/L of green iron. Maximum decolorization was attained at lower dye concentration and showed very little impact on decolorization when pH was increased from 3 to 11. The pseudo-first-order fit confirms the reaction between iron particles and dye molecules with rate constant 0.317–0.422 and it is followed by adsorption, data fit with pseudo-second-order model. Hence, not only adsorption but also the reduction process is involved in the reactive dye decolorization. Benzene, phenyl sodium, 2-chloro-1,3,5-triazine, naphthalene, sodium benzene sulfonate, benzene 1,2 di amine, anthracene-9,10 dione, aniline, phenol, benzene sulfonic acid were the major intermediates detected in dye decolorization and the respective reaction pathway is proposed. Green iron from grape leaves extract demonstrated better performance and it is recognized as the promising cost-effective material for textile wastewater treatment.

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Laksmi, Fina Amreta, Eva Agustriana, Isa Nuryana, Rike Rachmayati, Urip Perwitasari, Rumaisha Rumaisha, and Ade Andriani. "Removal of Textile Dye, RBBR, via Decolorization by Trametes hirsuta AA-017." Biosaintifika: Journal of Biology & Biology Education 13, no. 3 (December 14, 2021): 319–27. http://dx.doi.org/10.15294/biosaintifika.v13i3.31632.

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The use of synthetic dyes has an impact on the possibility of disposing such dyes into the environment. Fungal decolorization is one promising approach due to its capability to degrade dyes, thus, exploring fungi that can be applied in dye decolorization is essential. We investigated our potential strain of Trametes hirsuta to decolorize Remazol brilliant blue R (RBBR). The enzyme activity of laccase in various conditions was observed using Syringaldazine as a substrate, while fungal immobilization was conducted using calcium alginate as a solid support. The results indicated that CuSO4 was the best inducer for the decolorization process. The fungus was able to perform 79.5% of RBBR decolorization for 48 hours in the presence of CuSO4. Laccase was the prominent detected ligninolytic enzyme when decolorization was performed. The immobilized cells were able to decolorize 85% RBBR under 0.8 mM CuSO4 andused for 3 cycles of decolorization. This study reveals the potential of fungal usage in the form of the immobilized and free cell to overcome the persistence of dye pollutants problem, as it is considered an effective, economic and eco-friendly approach for RBBR dye decolorization. These strategies can be suggested to encourage ecologically sustainable development for bioremediation.

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Muliadi, Fatin Natasha Amira, Mohd Izuan Effendi Halmi, Samsuri Bin Abdul Wahid, Siti Salwa Abd Gani, Uswatun Hasanah Zaidan, Khairil Mahmud, and Mohd Yunus Abd Shukor. "Biostimulation of Microbial Communities from Malaysian Agricultural Soil for Detoxification of Metanil Yellow Dye; a Response Surface Methodological Approach." Sustainability 13, no. 1 (December 25, 2020): 138. http://dx.doi.org/10.3390/su13010138.

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In the present study, a mixed culture from a local agricultural soil sample was isolated for Metanil Yellow (MY) dye decolorization. The metagenomic analysis confirmed that 42.6% has been dominated by genus Bacillus, while Acinetobacter (14.0%) is present in the microbial communities of the mixed culture. For fungi diversity analysis, around 97.0% was “unclassified” fungi and 3% was Candida. The preliminary investigation in minimal salt media (MSM) showed that 100% decolorization was achieved after 24 h of incubation. Response surface methodology (RSM) was successfully applied using Box-Behnken design (BBD) to study the effect of four independent parameters—MY dye concentration, glucose concentration, ammonium sulfate concentration, and pH—on MY dye decolorization by the mixed bacterial culture. The optimal conditions predicted by the desirability function were 73 mg/L of MY, 1.934% glucose, 0.433 g/L of ammonium sulfate, and a pH of 7.097, with 97.551% decolorization The correlation coefficients (R2 and R2 adj) of 0.913 and 0.825 indicate that the established model is suitable to predict the effectiveness of dye decolorization under the investigated condition. The MY decolorization of the mixed bacterial culture was not affected by the addition of heavy metals in the growth media. Among the 10 heavy metals tested, only copper gave 56.19% MY decolorization, whereas the others gave almost 100% decolorization. The decolorization potential of the mixed bacterial culture indicates that it could be effective for future bioremediation of soil-contaminated sites and treatment solutions of water bodies polluted with the MY dye.

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Li, Na, Hai Biao Liu, Xiu Yan Zhou, Yu Heng Wang, and Xiao Yan Zheng. "Preparation of Microwave Organic Modified Montmorillonites and Decolorization on Dye Wastewater of Acid Fuchsin." Advanced Materials Research 366 (October 2011): 301–5. http://dx.doi.org/10.4028/www.scientific.net/amr.366.301.

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The main difficult problem was decolorization in the treatment of dye wastewater. Organic modified montmorillonite could be a good adsorbent to settle this problem. An organic modified montmorillonite was prepared using microwave irradiation method instead of common water bath heating method, and the decolorization on dye watewater of acid fuchsin was reasearched. Its decolorization on acid fuchsin solution was better obviously than that of montmorillonite. And the decolorization rate was increase with the increase of the initial concentration of acid fuchsin. When the concentration of acid fuchsin solution was 40 mg/L, the optimum decolorization condition was 0.1 g of adsorbent quantity, 6.1 of pH, 30 min of contact time, and 25 °C of operation temperature.

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Espinoza, Isabel, Christian Sandoval-Pauker, Guerrero Ramos, Jentzsch Vargas, and Bisesti Muñoz. "Fenton process combined with precipitation for the removal of Direct Blue 1 dye: A new approach." Journal of the Serbian Chemical Society 85, no. 4 (2020): 547–58. http://dx.doi.org/10.2298/jsc190804119e.

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Azo dyes are recalcitrant pollutants present in effluents of several industries. Due to their chemical stability, their degradation efficiency is not satisfactory by conventional technologies. Advanced oxidation processes, such as Fenton, can be applied for the removal of recalcitrant compounds. However, these methods are still costly. In this work, Fenton and precipitation treatments were combined for the removal (i.e., decolorization) of direct blue 1 (DB1), as an option to decrease operational costs. The individual treatments were studied separately using DB1 solutions 0.04 mmol L-1 to determine the effects of the parameters involved in each process. For the Fenton treatment, the c(Fe2+):c(H2O2) ratio that allowed the highest DB1 decolorization was 1:40. Regarding precipitation, the highest dye decolorization was achieved at a pH value of 6.0. Moreover, it was determined that a minimum c(DB1):c(Fe2+) ratio of 1:7.7 is needed to allow the decolorization of the dye by precipitation. Fenton assisted with precipitation tests were performed with DB1 solutions 0.09 mmol L-1 and using a c(DB1):c(Fe2+) ratio of 1:7.3 (which allows only partial precipitation of DB1). The results suggested that the dye can be treated by a Fenton process for 5 min and then precipitated to achieve the almost total decolorization of the dye (97.79 %). Azo dyes are recalcitrant pollutants present in effluents of several industries. Due to their chemical stability, their degradation efficiency is not satisfactory by conventional technologies. Advanced oxidation processes, such as Fenton, can be applied for the removal of recalcitrant compounds. However, these methods are still costly. In this work, Fenton and precipitation treatments were combined for the removal (i.e., decolorization) of direct blue 1 (DB1), as an option to decrease operational costs. The individual treatments were studied separately using DB1 solutions 0.04 mmol L-1 to determine the effects of the parameters involved in each process. For the Fenton treatment, the c(Fe2+):c(H2O2) ratio that allowed the highest DB1 decolorization was 1:40. Regarding precipitation, the highest dye decolorization was achieved at a pH value of 6.0. Moreover, it was determined that a minimum c(DB1):c(Fe2+) ratio of 1:7.7 is needed to allow the decolorization of the dye by precipitation. Fenton assisted with precipitation tests were performed with DB1 solutions 0.09 mmol L-1 and using a c(DB1):c(Fe2+) ratio of 1:7.3 (which allows only partial precipitation of DB1). The results suggested that the dye can be treated by a Fenton process for 5 min and then precipitated to achieve the almost total decolorization of the dye (97.79 %).

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Nguyen, Quang Phi, Zhao Nan Sun, and Xiao Min Hu. "Decolorization of Direct Yellow R Dye from Aqueous Solution by Aluminum Anode Electrochemical." Advanced Materials Research 581-582 (October 2012): 58–63. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.58.

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The present study applied Aluminum anode electrochemical method to decolorize direct yellow R wastewater. Experiments were conducted in electrochemical cell system with dimensions of 60 mm ´ 40 mm ´ 2 mm, a steel cathode and aluminum anode. Decolorization efficiency and electrical energy consumption were also calculated to compare optimal values. The effects of factors consist of current density, initial pH, initial dye concentration and electrolyte solution concentration on color removal efficiency have been also investigated. The results of study suggested that direct yellow R dye decolorization was very effective by using treatment technique applied in the study. The optimal values of impact factors were also indicated by. The initial dye concentration of 50 mg/l, initial pH value of 6.76, and current density of 2.5 mA/cm2 and Na2SO4 electrolyte concentration of 0.1mol/L were optimal conditions for dye decolorization. Besides that, the dye decolorization might reached the highest efficiency of 96.1% once it was conducted at temperature of 20°C, electrode distance of 16 mm and electrolyte time of 60 minutes. Energy consumption for decolorization in conditions mentioned above was 2.399 kWh/kg-dye.

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Singh, Pradeep Kumar, Pankaj Singh, Rajat Pratap Singh, and Ram Lakhan Singh. "Biodecolorization of Azo Dye Acid Blue 113 by Soil Bacterium Klebsiella variicola RMLP1." Journal of Ecophysiology and Occupational Health 21, no. 2 (June 17, 2021): 64. http://dx.doi.org/10.18311/jeoh/0/27108.

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The present study was aimed to isolate a new bacterial strain for the degradation/decolorization of azo dye Acid Blue 113 (AB 113). The physico-chemical method is inadequate for degradation of azo dyes; therefore, an environmental friendly and competent method such as use of the biological organism was studied for decolorization of AB 113. Bushnell and Hass (BHM) medium containing AB 113 dye were used to perform the decolorization study. 16S rRNA gene sequencing approach was used for identification of bacterial isolate as a <em>Klebsiella variicola</em>. The optimum process parameters for the decolorization of AB 113 were found at pH 8, 35°C temperature and 100 mg/L dye concentration during 72 h incubation. Glucose and ammonium sulphate was the carbon and nitrogen source suited well for the decolorization of dye. The results proved that the <em>Klebsiella variicola</em>, offer huge ability in treating textile wastewater containing the color AB 113.

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Wu, Wen Tung. "The Potential Application of Light-Emitting Diode on Biodecolorization of Azo Dye." Advanced Materials Research 717 (July 2013): 240–43. http://dx.doi.org/10.4028/www.scientific.net/amr.717.240.

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In the previous study, the decolorization of azo dye was significantly enhanced by the light irradiation. The aim of this study is to investigate the effect of methyl orange decolorization under light-emitting diode (LED). The effect of media, pHs, and nitrogens on methyl orange decolorization by freely suspended cells are examined. The results showed that the optimal conditions for the methyl orange decolorization by theTsukamurellasp. J8025 are incubation at 30 °C and pH 8.0 in YEME medium under white-light LED.

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Mathivanan, Mahalakshmi, Prabinth V, Selvin Chinnaiah S, and Shanmuga Sundaram RS. "Dye Degradation using Saccharomyces Cerevisiae." International Journal of Engineering & Technology 7, no. 3.12 (July 20, 2018): 180. http://dx.doi.org/10.14419/ijet.v7i3.12.15915.

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Disposal of dyes into the environment causes serious damage and they may be toxic to some aquatic organisms due to their breakdown products. The colouring pigments present in the effluent may give aesthetic look and it affects the photosynthetic in plants. The chemical and physical methods have many disadvantages which can overcome by biological method because it is cost saving and environmentally benign. In biological methods, absorbents like Bacteria, fungus, cellular membrane etc. can be used. Since yeast is cheap and more effective it is preferred. In the present study an attempt was made to examine the potential of Saccharomyces Cerevisiae in decolorization of Congo red dye. The influence of different condition in variation of concentration, time and pH in that Study was made to find the optimum condition in which the maximum decolorization was occur. The UV Spectrum shows the maximum wavelength was observed in 496.93. At room temperature, the maximum decolorization of 90.7% was observed in the concentration of 40 ppm(0.004g/100ml) and it took place after 18hrs. In the next experiment, maximum decolorization of 96.88% was obtained in the concentration of 40ppm(0.004g/100ml) and pH of 4 at a time of 17hrs with a dosage of 0.1g in room temperature which is considering to be the optimum condition. The above results show the potential of this Saccharomyces Cerevisiae to be used in the biological treatment of textile effluent under optimum condition.

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Chang, Yunkang, Dandan Yang, Rui Li, Tao Wang, and Yimin Zhu. "Textile Dye Biodecolorization by Manganese Peroxidase: A Review." Molecules 26, no. 15 (July 21, 2021): 4403. http://dx.doi.org/10.3390/molecules26154403.

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Wastewater emissions from textile factories cause serious environmental problems. Manganese peroxidase (MnP) is an oxidoreductase with ligninolytic activity and is a promising biocatalyst for the biodegradation of hazardous environmental contaminants, and especially for dye wastewater decolorization. This article first summarizes the origin, crystal structure, and catalytic cycle of MnP, and then reviews the recent literature on its application to dye wastewater decolorization. In addition, the application of new technologies such as enzyme immobilization and genetic engineering that could improve the stability, durability, adaptability, and operating costs of the enzyme are highlighted. Finally, we discuss and propose future strategies to improve the performance of MnP-assisted dye decolorization in industrial applications.

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Zhang, You, Zi Chao Wang, Meng Chun Gao, Zong Lian She, Xiao Jing Zhang, and Hui Xin Yang. "Study on the Decolorization Kinetics of Azo Dye Wastewater by Sponge Iron." Applied Mechanics and Materials 178-181 (May 2012): 450–53. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.450.

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A study on the decolorization of azo dye wastewater by sponge iron was carried out in order to establish a model of decolorization kinetics, and to investigate the effects of particle size of sponge iron, the initial pH of azo dye wastewater and reaction temperature on the reaction rate constant. The results showed that the decolorization processes of azo dye wastewater by sponge iron was first order kinetic reaction, and reaction rate constant presented high value on the condition of small particle size of sponge iron, low initial pH of azo dye wastewater and high reaction temperature.

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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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Lal, Nand, Anuradha Tiwari, Neelam Pal, Shweta Chand, Sunil Kumar Gupta, and Ashok Singh. "Bioremoval of an Industrial Acidic Azo Dye by a Bacterial Strain Escherichia Coli -K-10." Journal of Forensic Chemistry and Toxicology 7, no. 2 (December 15, 2021): 53–57. http://dx.doi.org/10.21088/jfct.2454.9363.7221.3.

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The removal of dyes from textile waste water by bacterium is one of the environmental friendly method. The decolorization of azodye metanil yellow studied at various concentration by a bacterial sp. Escherichia coli-K-10 (E.coli K-10). The 0.01 mM, 0.02 mM and 0.05 mM concentration of the dyes was 100% decolorized within 40 hrs, 46 hrs and 52 hrs respectively. Decolorization of dyes was monitored by UV/VIS spectrophotometer. Initially, a highest peak of the dye solution was detected at 437nm (λmax of the metanil yellow). The peak disappears from the decolorized solution, indicating that the decolorization of the dye is due to dye degradation. This bacterial sp. has also been used for the decolorization of other azodyes, methyl orange and congo red. The 0.02 mM & 0.04 mM methyl orange became 100% decolorized during 44 hours but the congo red did not. Keywords: Bioremoval; Metanil yellow; Dye effluents; E.coli K- 10.

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Muliadi, Fatin Natasha Amira, Mohd Izuan Effendi Halmi, Samsuri Bin Abdul Wahid, Siti Salwa Abd Gani, Khairil Mahmud, and Mohd Yunus Abd Shukor. "Immobilization of Metanil Yellow Decolorizing Mixed Culture FN3 Using Gelling Gum as Matrix for Bioremediation Application." Sustainability 13, no. 1 (December 22, 2020): 36. http://dx.doi.org/10.3390/su13010036.

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In this study, the Metanil Yellow (MY) decolorizing mixed culture, namely FN3, has been isolated from agriculture soil. The mixed culture was immobilized using gellan gum. In order to optimize the immobilization process for maximal dye decolorization, Response Surface Methodology (RSM) was performed. The optimal conditions for immobilization predicted by desirability function are 130 mg/L of MY dye concentration, 1.478% of gellan gum concentration, 50 beads and 0.6 cm of beads size with the percentage of decolorization of 90.378%. The correlation coefficients of the model (R2 and R2 adj) are 0.9767 and 0.9533, respectively. This indicates that the established model is suitable to predict the effectiveness of dye decolorization under the investigated condition. The immobilized beads of mixed culture FN3 were able to be reused up to 15 batches of decolorization. The immobilized cells also have high tolerance towards heavy metals. This was proven by higher dye decolorization rate by the immobilized cells even with the addition of heavy metals in the media. The decolorization potential of the mixed culture indicates that it could be useful for future bioremediation of soil contaminated sites and treatment solutions of water bodies polluted with MY dye.

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dos Santos, A. B., J. Traverse, F. J. Cervantes, and J. B. van Lier. "Thermophilic treatment by anaerobic granular sludge as an effective approach to accelerate the electron transfer and improve the reductive decolorization of azo dyes in bioreactors." Water Science and Technology 52, no. 1-2 (July 1, 2005): 363–69. http://dx.doi.org/10.2166/wst.2005.0540.

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The effects of temperature, hydraulic retention time (HRT), and the redox mediator, anthraquinone-2,6-disulfonate (AQDS), on electron transfer and subsequent reductive decolorization of dyes from textile wastewater was assessed in mesophilic and thermophilic anaerobic bioreactors. The results clearly show that compared to mesophilic anaerobic treatment, thermophilic treatment at 55 °C is an effective approach for increasing the electron transfer capacity in bioreactors, and thus improving the decolorization rates. At an HRT of 2.5 h and in the absence of AQDS, the color removal was 5.3-fold higher at 55 °C compared to 30 °C. Furthermore, similar decolorizations were found at 55 °C between the AQDS-free and AQDS-supplemented reactors, whereas a significant difference (up to 3.6-fold) on dye reduction occurred at 30 °C.

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Deivasigamni, Manimaran Rajavelu, and P. Ramalingam. "Decolorization and Biodegradation of basic violet dye by fungal- bacterial consortia." JOURNAL OF ADVANCES IN CHEMISTRY 13, no. 3 (February 20, 2017): 6438–44. http://dx.doi.org/10.24297/jac.v13i0.4073.

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The present study was aimed to test the ability of Penicillium citrinum MTCC 8009, Aspergillusterreus MTCC 3006, Bacillus cohnii and their consortia to decolorize basic violet dye. Different parameters such as initial dye concentration, dye to inoculum ratio and period of incubation were studied for the decolourization of the dye. The developed fungal-bacterial consortia exhibited maximum percent decolorization (92%) ability when compared to the treatment of dyes by individual microbes. Percent decolorization of basic violet dye (92%) was more efficient using fungal-bacterial (Penicillium citrinum and Bacillus cohnii) consortia than with individual cultures. Phyto-toxicity results indicated that bacterial-fungal consortia (Penicillium citrinum and Bacillus cohnii) treatmentÂ was believed to degrade the dyes to non-toxic intermediates. The FTIR analysis also revealed that decolorization of basic violet dyes was due to its degradation.

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Vinayak, Ankita, and Gajendra Bahadur Singh. "Decolorization of Reactive Black 5 by Immobilized Bacterial Cells." ECS Transactions 107, no. 1 (April 24, 2022): 11105–12. http://dx.doi.org/10.1149/10701.11105ecst.

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Azo dyes are xenobiotic contaminants that pose a substantial risk to environmental and human health. The study investigates biodecolorization potential of immobilized bacterial cells. Newly isolated bacterial cells were immobilized with two support matrices viz. sodium alginate and magnetite nanoparticles for the decolorization of model azo dye - reactive black 5. The bacterial cells coated with magnetic nanoparticles displayed complete decolorization of dye (100 ppm) in 16 h, while cells immobilized in sodium alginate beads required more time for complete removal of dye (24 h). Coated bacterial cells exhibited stable decolorization with repeated use for 12 cycles. However, due to destabilization of sodium alginate beads and subsequent cell leaching, stable decolorization was observed until 3rd cycle only. Nanoparticles coated bacterial cells offer the advantage of easy separation, allowing the cells to be reused for multiple cycles. Biodecolorized medium was analyzed by UV-Vis spectroscopy and FTIR techniques. The magnetic nanoparticles and coated bacterial cells were characterized through XRD and SEM, respectively. Overall results indicate that magnetite nanoparticles coated bacterial cells could be an effective tool for the decolorization of azo dyes.

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Kunjadia, Prashant D., Fenil D. Patel, Anju Nagee, Pratap N. Mukhopadhyaya, and Gaurav S. Dave. "Crystal violet (triphenylmethane dye) decolorization potential of Pleurotus ostreatus (MTCC 142)." BioResources 7, no. 1 (January 24, 2012): 1189–99. http://dx.doi.org/10.15376/biores.7.1.1189-1199.

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The extracellular enzyme production capacity of Pleurotus ostreatus MTCC 142 was investigated for decolorization of crystal violet under solid and submerged conditions. Laccases are the major extracellular lignocellulolytic enzymes produced by fungus. Pleurotus ostreatus provided an effective decolorization of dye at 20 mg/L concentration up to 92%. Mycelial growth was observed maximum on plate for a dye concentration 20 mg/L while lowest on 200 mg/L on day 12, respectively. At all concentrations of dye studied, maximum laccase activity was observed on day 8. For 20 mg/L of dye laccase activity was 133 U/L. The decolorization was attributed to microbial action and without role of pH change; less than 0.4 pH change was observed. Manganese dependent peroxidase activity was 106 U/L, maximum on day 8 incubated with 20 mg/L dye concentration. The present study suggested that the high efficiency decolorization of crystal violet by P. ostreatus was assisted by laccase and manganese-dependent peroxidase activity and can be exploited as a promising in biological treatment of waste water containing crystal violet.

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Bi, Yan Jie, Yu Kun Ma, Sheng Liang Zheng, and Bin Song Wang. "Heterogeneous Fenton System Dynamic Decolorization of Simulated Dye Wastewater." Advanced Materials Research 641-642 (January 2013): 30–34. http://dx.doi.org/10.4028/www.scientific.net/amr.641-642.30.

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Using heterogeneous Fenton system dynamic method, a decolorization test was operated for three kinds of simulated dye wastewater (Reactive Red KE-3B, Reactive Yellow KE-4R and Reactive Blue KN-R). Through the single factor experiments to examine the pH, H2O2 dosage, catalyst dosage, reaction temperature and residence time of simulated dye wastewater effected on the simulated dye wastewater decolorization rate. Determined the best decolorization reaction conditions as pH value of 4, the H2O2 concentration of 800 mg/L, catalyst dosage of 20 g, reaction temperature of 60 °C and reaction residence time of 9 minutes. Under this reaction conditions, in heterogeneous fenton system, degradation rate of the three kinds of simulated wastewater reached 95.01%, 93.86% and 97.74%, respectively.

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35

Gunti, Hema, Vyshali Venkatappa Maruthiramaih, and Tippeswamy Boreddy Shivanandappa. "Bio-degradation of Azo Dye Acid Orange-10 by a New Isolate of Bacillus subtilis Isolated from Soil Sample around Textile Industry in South Karnataka." Biosciences Biotechnology Research Asia 17, no. 4 (January 15, 2021): 707–16. http://dx.doi.org/10.13005/bbra/2875.

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Untreated effluents from the textile industry affect aquatic life irreversibly. Synthetic dyes not only change the color of water resources but also make them hazardous.The main objective of the study was to evaluate the decolorizing potential of a new isolate of Bacillus subtilis from soil samples contaminated with industrial effluent in and around textile industrial area in South Karnataka. This isolate of Bacillus subtilis has high decolorizing potential and took only 24 hrs for complete decolorization of acid orange-10 azo dye at 200ppm. Different parameters like temperature, pH, aeration, dye concentration and inoculum size were optimized for complete decolorization of Acid orange-10 azo dye by this isolate of Bacillus subtilis. The dye was completely decolorized at 400C within 24 hrs and it was capable of decolorizing 700 ppm dye in 72 hrs. Optimum pH was found to be 8.5 and maximum decolorization was achieved under static conditions. As the inoculum size increased, the time taken for complete decolorization of Acid orange-10 dye was decreased from 36 hrs at 1% to 16 hrs at 10% of inoculum size. The new isolate decolorizes 100 ppm of dye completely (i.e.100%) within 12hrs of incubation. The time taken for the complete decolorization increased with increase in the concentration of Acid orange-10 azo dye. In conclusion, the new isolate of Bacillus subtilis from soil samples contaminated with textile industrial effluent was found to be a potential candidate for decolorization of Acid orange-10 azo dye in textile effluents.

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Avelino, Katielle Vieira, Marisangela Isabel Wietzikoski Halabura, Renan Alberto Marim, Nelma Lopes Araújo, Maria Graciela Iecher Faria Nunes, Dayane Lilian Gallani Silva, Giani Andrea Linde Colauto, Nelson Barros Colauto, and Juliana Silveira do Valle. "Coculture of white rot fungi enhance laccase activity and its dye decolorization capacity." Research, Society and Development 9, no. 11 (December 6, 2020): e88191110643. http://dx.doi.org/10.33448/rsd-v9i11.10643.

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Fungal cocultures can promote complex interactions that result in physiological and biochemical alterations that favor the synergic and more efficient action of extracellular enzymes such as laccase. Thus, coculture can be used as a strategy to increase enzymatic activity, dye degradation, and bioremediation of textile effluents. This study aimed to evaluate the coculture effect of Lentinus crinitus, Pleurotus ostreatus, Pycnoporus sanguineus, and Trametes polyzona on laccase activity, mycelial biomass production, and in vitro decolorization of azo, anthraquinone, and triphenylmethane dyes. The species were cultivated in liquid medium in monoculture and coculture in paired combinations for 15 days to determine the laccase activity and produced mycelial biomass. The enzymatic extracts of fungal cultivations were used in decolorization tests of reactive blue 220 (RB220), malachite green (MG), and remazol brilliant blue R (RBBR). Pleurotus-Trametes, Lentinus-Pleurotus, and Lentinus-Trametes cocultures increase laccase activity compared to respective monocultures. Lentinus-Pycnoporus, Lentinus-Trametes, Lentinus-Pleurotus, and Pleurotus-Trametes cocultures stimulate mycelial biomass production in relation to their respective monocultures. The enzymatic extracts of monocultures and cocultures promoted the decolorization of all dyes. RB220 dye presented fast decolorization. In 24 h, all extracts reached maximum decolorization and the greatest color reduction percentage was 90% for Pleurotus-Trametes coculture extract. Pleurotus-Trametes extract also increased the decolorization of MG and RBBR dyes when compared to their respective monocultures in 48 h and 72 h, respectively. However, RBBR dye presented the greatest resistance to decolorization.

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Wang, Yajie, Xin Dong, Chengfeng Liu, Peng Cheng, and Gilles Mailhot. "Efficient Decolorization of Azo Dye Orange II in a UV-Fe3+-PMS-Oxalate System." Processes 11, no. 3 (March 16, 2023): 903. http://dx.doi.org/10.3390/pr11030903.

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The decolorization of azo dye Orange II using a UVA-Fe3+-PMS-oxalate system was studied. A series of experiments was performed to investigate the effects of several variables, including the pH, PMS dosage, Fe3+ concentration, oxalate concentration, and coexisting anions. The results revealed that a lower pH facilitated the decolorization, and relatively high decolorization efficiency (97.5%) could be achieved within 5 min at pH 3.0. The electron paramagnetic resonance (ESR) and radical quenching experiments revealed that SO4•− played a crucial role in the decolorization of Orange II (85.8%), •OH was of secondary importance (9%), and 1O2 made a small contribution to the decolorization (5.2%). Furthermore, the formation of •OH in the experimental system strongly depended on HO2•/O2•−. These reactive oxidants were able to directly attack the azo bond of the luminescent group in Orange II and initiate the decolorization process. The efficient UVA-Fe3+-PMS-oxalate system showed great application potential in the treatment of wastewater contaminated by azo dyes.

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Radovic, Miljana, Jelena Mitrovic, Danijela Bojic, Milos Kostic, Radomir Ljupkovic, Tatjana Andjelkovic, and Aleksandar Bojic. "Effects of operational parameters of process UV radiation/hydrogen peroxide on decolorization of anthraquinone textile dye." Chemical Industry 66, no. 4 (2012): 479–86. http://dx.doi.org/10.2298/hemind111108112r.

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The photodegradation of textile dye Reactive Blue 19, an anionic anthraquinone dye of reactive class, was investigated using UV radiation in the presence of H2O2 in UV reactor with low-pressure mercury lamps, with maximum energy output at the wavelength 254 nm. The effects of experimental variables, namely initial pH, initial dye concentration and concentration of peroxide were studied. The change of concentration of RB19 was followed by UV/vis spectrophotometric measurement of absorbance at 592 nm. The increase of the initial pH resulted in the efficiency increase of dye decolorization. The total decolorization was achieved in about 15 min. Results show that with the increase of dye concentration from 10 to 100 mg dm-3 the efficiency of process decreases. With the increase of the initial concentration of H2O2 from 10 to 30 mmol dm-3, the decolorization rate constant increased from 0.083 to 0.120 min1, with the decrease of process rate at the concentrations above. The highest decolorization rates were achieved at peroxide concentration of approx. 30 mmol dm-3, above which decolorization was inhibited by scavenging effect of peroxide. This study shows that UV/H2O2 process is promising treatment for dye RB 19 degradation in water and wastewater.

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Lu, Lei, Min Zhao, De Bin Li, Li Yan Zhao, Mei Hui Du, Tian Nv Wang, Tai Lun Li, and Jun Bo Pan. "Mediator-Based Decolorization of Recalcitrant Dyes with Laccase from Bacillus amyloliquefaciens LS01." Advanced Materials Research 183-185 (January 2011): 768–72. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.768.

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The spore laccase of Bacillus amyloliquefaciens LS01 was evaluated for its ability in decolorization of different synthetic dyes. The decolorization process was not efficient by the laccase alone. The addition of mediators could remarkably improve the efficiency of dye decolorization. Remazol Brilliant Blue R and reactive black 5 were resistant to decolorization for most mediators. Acetosyringone was proved to be the best mediator for the spore laccase, and a decolorization of 63−82% was achieved for all the tested dyes in the presence of acetosyringone. The results indicate that the spore laccase-mediator system could be used for the treatment of industrial dye effluents.

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Wang, Zheng Hua, Bo Zhi Ren, and Pu Wang. "Decolorization of Mordant Red 15 Dye in Water by Potassium Ferrate (VI)." Advanced Materials Research 838-841 (November 2013): 2445–48. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.2445.

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Decolorization of the Mordant red 15 dye in water was investigated in laboratory-scale experiments using potassium ferrate (VI). The effect of corresponding parameters such as reaction time, concentration of potassium ferrate, pH values and the addition of H2O2 were considered in the experiments. The results indicated that about 78% dye decolorization was obtained in less than 30 min under optimum conditions. The pH values and concentration of ferrate (VI) were correlated with color removal rate of Mordant red 15 dye. The optimum pH value and ferrate (VI) concentration are 5 and 450 mg/L, respectively. Addition of H2O2 could initiate the Fenton reaction and result in 84.46% decolorization of dye in 30 min. Due to high ability of oxidizing and flocculation, potassium ferrate (VI) is an effect way for treatment of dyes in water.

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Zhang, Jun, and Yang Zhu. "Decolorization Kinetics and Properties of Triphenodioxazine Reactive Dyes in Sodium Perborate-TAED Bleaching System." Advanced Materials Research 550-553 (July 2012): 2612–15. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2612.

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The decolorization behaviors of a triphenodioxazine reactive dye (C.I. Reactive Blue 198) in the activated oxygen bleach system containing sodium perborate (PB) and tetra-acetylethylenediamine (TAED) were investigated. The decolorization kinetics of the dye was found to follow the first-order kinetic model and the rate constant of decolorization increased significantly with increasing temperature. The activation energy for decolorizing reaction was 50.41 kJ/mol. The highest rate constant appeared at pH 8. The triphenodioxazine reactive dye showed poor stability to activated oxygen washing.

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Ogugbue, Chimezie Jason, and Thomas Sawidis. "Bioremediation and Detoxification of Synthetic Wastewater Containing Triarylmethane Dyes by Aeromonas hydrophila Isolated from Industrial Effluent." Biotechnology Research International 2011 (July 25, 2011): 1–11. http://dx.doi.org/10.4061/2011/967925.

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Economical and bio-friendly approaches are needed to remediate dye-contaminated wastewater from various industries. In this study, a novel bacterial strain capable of decolorizing triarylmethane dyes was isolated from a textile wastewater treatment plant in Greece. The bacterial isolate was identified as Aeromonas hydrophila and was shown to decolorize three triarylmethane dyes tested within 24 h with color removal in the range of 72% to 96%. Decolorization efficiency of the bacterium was a function of operational parameters (aeration, dye concentration, temperature, and pH) and the optimal operational conditions obtained for decolorization of the dyes were: pH 7-8, 35∘C and culture agitation. Effective color removal within 24 h was obtained at a maximum dye concentration of 50 mg/L. Dye decolorization was monitored using a scanning UV/visible spectrophotometer which indicated that decolorization was due to the degradation of dyes into non-colored intermediates. Phytotoxicity studies carried out using Triticum aestivum, Hordeum vulgare, and Lens esculenta revealed the triarylmethane dyes exerted toxic effects on plant growth parameters monitored. However, significant reduction in toxicity was obtained with the decolorized dye metabolites thus, indicating the detoxification of the dyes following degradation by Aeromonas hydrophila.

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Sun, Su, Pengyang Liu, and Mati Ullah. "Efficient Azo Dye Biodecolorization System Using Lignin-Co-Cultured White-Rot Fungus." Journal of Fungi 9, no. 1 (January 7, 2023): 91. http://dx.doi.org/10.3390/jof9010091.

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The extensive use of azo dyes by the global textile industry induces significant environmental and human health hazards, which makes efficient remediation crucial but also challenging. Improving dye removal efficiency will benefit the development of bioremediation techniques for textile effluents. In this study, an efficient system for azo dye (Direct Red 5B, DR5B) biodecolorization is reported, which uses the white-rot fungus Ganoderma lucidum EN2 and alkali lignin. This study suggests that the decolorization of DR5B could be effectively enhanced (from 40.34% to 95.16%) within 48 h in the presence of alkali lignin. The dye adsorption test further confirmed that the alkali-lignin-enhanced decolorization of DR5B was essentially due to biodegradation rather than physical adsorption, evaluating the role of alkali lignin in the dye biodegradation system. Moreover, the gas chromatography/mass spectrometry analysis and DR5B decolorization experiments also indicated that alkali lignin carried an excellent potential for promoting dye decolorization and displayed a significant role in improving the activity of lignin-modifying enzymes. This was mainly because of the laccase–mediator system, which was established by the induced laccase activity and lignin-derived small aromatic compounds.

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Baffoun, Ayda, Amel El Ghali, and Imen Hachani. "Decolorization Kinetics of Acid Azo Dye and Basic Thiazine Dye in Aqueous Solution by UV/H2O2 and UV/Fenton: Effects of Operational Parameters." Autex Research Journal 17, no. 1 (March 1, 2017): 85–94. http://dx.doi.org/10.1515/aut-2016-0031.

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AbstractThe photochemical decolorization of two dyes, namely Acid Yellow 54 and Basic Blue 9, was studied using the UV/H2O2and UV/Fenton processes. The effects of the amount of H2O2and FeSO4as well as the initial pH solution on decolorization kinetics of both the dyes were investigated. The pseudo-first order kinetic model was applied to predict the decolorization of the selected dyes at the different operational conditions and results showed that this model fitted very well with the experimental data. The obtained results also showed the efficiency of UV/Fenton process to quickly degrade aqueous effluents polluted by Acid Yellow 54 and Basic Blue 9 compared to the UV/H2O2process.

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Ilamathi, R., and J. Jayapriya. "Microbial fuel cells for dye decolorization." Environmental Chemistry Letters 16, no. 1 (October 23, 2017): 239–50. http://dx.doi.org/10.1007/s10311-017-0669-4.

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Parmar, Neha, and Sanjeev R. Shukla. "Microbial Decolorization of Reactive Dye Solutions." CLEAN - Soil, Air, Water 43, no. 10 (September 28, 2015): 1426–32. http://dx.doi.org/10.1002/clen.201400441.

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Sekuljica, Natasa, Nevena Prlainovic, Jelena Jovanovic, Andrea Stefanovic, Sanja Grbavcic, Dusan Mijin, and Zorica Knezevic-Jugovic. "Immobilization of horseradish peroxidase onto kaolin by glutaraldehyde method and its application in decolorization of anthraquinone dye." Chemical Industry 70, no. 2 (2016): 217–24. http://dx.doi.org/10.2298/hemind150220028s.

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The problem of environmental pollution day by day becomes more worrisome, primarily due to the large amounts of wastewater contaminated with various harmful organic compounds, discharged into the environment untreated or partially clean. Feasibility of use of horseradish peroxidase (Amoracia rusticana) in the synthetic dyes decolorization was approved by many researchers. Among a number of supports used for the immobilization, it was found that natural clay, kaolin has excellent features which are a precondition for obtaining biocatalysts with the excellent performances. For this reason, a horseradish peroxidase was immobilized onto kaolin using glutaraldehyde as a cross-linking agent. Obtained biocatalyst was applied in the decolorization of anthraquinone dye C. I. Acid Violet 109. Under determined optimal conditions (pH 4.0, hydrogen peroxide concentration 0.6 mM, dye concentration 30 mg L-1, temperature 24?C) around 76 % of dye decolorization was achieved. Reusability study showed that resulting biocatalyst was possible to apply four times in the desired reaction with relatively high decolorization percentage.

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Avramova, Tatyana, Lilyana Stefanova, Blaga Angelova, and Sava Mutafov. "Bacterial Decolorization of Acid Orange 7 in the Presence of Ionic and Non-Ionic Surfactants." Zeitschrift für Naturforschung C 62, no. 1-2 (February 1, 2007): 87–92. http://dx.doi.org/10.1515/znc-2007-1-216.

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The effects of the non-ionic surfactant Triton® X-100, the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the anionic surfactant sodium N-lauroyl sarcosinate (SLS) on the decolorization of the reaction medium containing the monoazo dye Acid Orange 7 (AO7) by Alcaligenes faecalis and Rhodococcus erythropolis were studied. It was found that the surfactants influenced in different ways the rate of decolorization. At all concentrations tested the non-ionic surfactant Triton X-100 decreased the decolorization rate of R. erythropolis. At concentrations above the critical micelle concentration (CMC) Triton X-100 upset the usually observed exponential decay of the dye with A. faecalis due probably to the existence of an outer membrane in this organism. In concentrations above the CMC the anionic surfactant SLS inhibited the decolorization and, at prolonged incubation, caused partial release of the bound dye. The cationic surfactant CTAB in concentrations above and below the CMC accelerated drastically the binding of AO7 to the cells causing a rapid staining of the biomass and complete decolorization of the reaction medium. An attempt was made for explanation of the observed differences by the negative electrostatic charge of the living bacterial cell.

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Ali Khan, Mohd Wajid. "Optimization of Pseudomonas aeruginosa isolated for bioremediation from Ha’il region of Saudi Arabia." Bioinformation 19, no. 9 (September 30, 2023): 893–900. http://dx.doi.org/10.6026/97320630019893.

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Majority of dyes are toxic to all the living organisms and inherently resistant to microbial degradation. Hence, decolorization and degradation of textile dye methyl red were evaluated using isolated bacterial strain Pseudomonas aeruginosa (P. aeruginosa). Methyl red dye decolourization by P. aeruginosa with respect to various parameters was optimized. Data shows that maximum possible decolorization was seen at 50 ppm dye concentration, 1400 mg/l glucose concentration, 700 mg/l sodium chloride (NaCl) concentration, pH 9, temperature 38 °C, 1000 mg/l urea concentration P. aeruginosa AM-1 strain. The highest percent (91.1%) of bioremediation was achieved at 40 ppm dye concentration in Allium cepa test. These findings suggest P. aeruginosa strain (AM-1) has the potential to be used in the biological treatment of highly toxic dye which is main constituent of dyeing mill effluents due to its high decolorization activity with simple conditions. Strain AW-1 strain also has potential to bioremediate other wastewater containing methyl red dye.

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Stupar, Stevan, Pavel Otřísal, Negovan Ivankovic, Dusan Mijin, Marija Vuksanovic, Radmila Jancic-Heinemann, and Aleksandra Samolov. "Sintered magnesium ferrite particles in decolorization of anthraquinone dye AV109: Combination of adsorption and fenton process." Science of Sintering, no. 00 (2024): 9. http://dx.doi.org/10.2298/sos240219009s.

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Magnesium ferrite (MgFe2O4) particles were synthetized by sol-gel method and used in the decolorization of the Acid Violet 109 (anthraquinone dye, AV109) water solutions' by combination of adsorption and heterogeneous Fenton process. The material's morphology and elemental analysis of the surface were revealed by Scanning electron microscopy and Energy Dispersive Spectroscopy (SEM/EDS). The X-Ray Diffraction (XRD) technique was used to analyze the crystallographic phase. In the first part of the decolorization experiment, the adsorption ability of the synthesized particles was investigated. During the adsorption study influence of pH was investigated. In the second part of the decolorization experiment, the effects of the various parameters on the Fenton process were studied such as the initial concentrations of hydrogen peroxide, dye, and magnesium ferrite particles. Influence of magnesium ferrite particles structure, pH value and reaction temperature were also investigated. The decolorization reaction was followed by UV-Visible (UV-Vis) spectrophotometry. At optimal conditions, the dye decolorization was 99.1% (55.4% by adsorption and 43.7% by the Fenton process). Both the adsorption and the Fenton process obey second-order kinetics.

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Journal articles on the topic 'Dye decolorization'

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