Journal articles: 'Decolorization'

1

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

2

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

3

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.

Full text

Abstract:

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).

APA, Harvard, Vancouver, ISO, and other styles

4

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.

Full text

Abstract:

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%

APA, Harvard, Vancouver, ISO, and other styles

5

Pang, Xiu-Yan. "Decolorization Kinetics and Thermodynamics of Auramine Lake Yellow O on Expanded Graphite Loaded with Titania." E-Journal of Chemistry 8, no. 4 (2011): 1644–53. http://dx.doi.org/10.1155/2011/208909.

Full text

Abstract:

In order to investigate the decolorization characteristics of expanded graphite (EG) loaded with titania for auramine lake yellow O adsorbate, the adsorbent is prepared with 50 mesh natural graphite as raw materials, potassium permanganate as oxidant and vitriol, tetranbutyl titanate as intercalation compound. The expanded volume of EG loaded with titania is 320 mL/g. We detect the equilibration time, influence of ionic strength and initial concentration of the adsorbate on decolorization rate. Based on pseudo first-order and second-order kinetic model, the decolorization model is discussed. Decolorization rate and activation energy were calculated. Studies show that decolorization rate of EG loaded with titania for auramine lake yellow O decrease with the increase of the adsorbate initial concentration and increase with the increase of ionic strength; the decolorization process can be well described by the pseudo second-order kinetic model; decolorization equilibrium time and half decolorization time decrease with the increase of temperature.

APA, Harvard, Vancouver, ISO, and other styles

6

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

7

Wang, Jie, and Xueyan Wang. "GPCC catalyzed hydrogen peroxide for decolorization of C.I. Reactive Red 24 from simulated dyeing wastewater." Water Science and Technology 82, no. 11 (October 23, 2020): 2381–88. http://dx.doi.org/10.2166/wst.2020.508.

Full text

Abstract:

Abstract A kind of gelatin protein copper complex (GPCC for short) was synthesized by us. GPCC acting as catalyst was applied to catalyzed hydrogen peroxide for decolorization of C.I. Reactive Red 24 from simulated dyeing wastewater. The influence of catalyzed hydrogen peroxide by GPCC on the decolorization of C.I. Reactive Red 24 from simulated dyeing wastewater was discussed. The optimum decolorization technology condition was optimized. And the effect of salt on decolorization of C.I. Reactive Red 24 in this catalytic system was also investigated. The results showed that hydrogen peroxide can be catalyzed by GPCC. In the catalytic system, the structure of C.I. Reactive Red 24 can be degraded and a high decolorization rate can be obtained in a wide pH range. In addition, the decolorization percentage and decolorization rate will be further improved when salt is present in the catalytic system.

APA, Harvard, Vancouver, ISO, and other styles

8

Liu, Bo, Wan Qian Guo, and Nan Qi Ren. "Decontamination of Wastewaters Containing Synthetic Organic Dyes by Electrochemical Methods: A Review." Advanced Materials Research 788 (September 2013): 405–8. http://dx.doi.org/10.4028/www.scientific.net/amr.788.405.

Full text

Abstract:

Bioelectrochemical systems or electrochemical reduction reactors have great potential for treating wastewater that contains dyes for decolorization. They are reported to enhance decolorization rate and degree with external energy supply and to help microorganisms or noble metal as catalysts. Till now literatures regarding dye decolorization with electron reduction using BESs or electrochemical reactors is deficient. This paper reviews the performance limitations, future prospects, and improvements of the common used dyes decolorization and decolorization with external voltage or current supply in Bioelectrochemical systems.

APA, Harvard, Vancouver, ISO, and other styles

9

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

10

He, Fang, Aya Obara, Shi Long Wang, and Li Guo Wang. "Degradation Characteristics of a Microbial Consortium on Direct Fast Scarlet 4BS." Advanced Materials Research 518-523 (May 2012): 2464–68. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.2464.

Full text

Abstract:

High-effective decolorization microbial consortium was isolated and selected by enrichment and optimizing combination decolorization experiments. The optimal microbial consortium consisting of a fungus P6 and a bacterium H5 could use Direct Fast Scarlet 4BS as sole source of carbon and energy. The microbial consortium showed a significant improvement on dye decolorization rate under shaking culture that might be attributed to the synergetic reaction of single strains. This study also examined the kinetics of 4BS decolorization by immobilized microbial consortium. The results demonstrated that the activity of microorganisms inside the immobilized beads can be increased remarkably and the dependence of specific decolorization rate on 4BS concentration could be described as a typical first-order reaction kinetic model. The changes of proliferation and distribution of microbial consortium in gel beads were microscopically observed, which could be used for analysis of decolorization mechanism of 4BS.

APA, Harvard, Vancouver, ISO, and other styles

11

Zhu, Jing Jian, Long Lu, and Jian Xin Chen. "Optimization of Operating Parameters for Decolorization of Metal Complex Dyes by UV/H₂O₂ Process." Advanced Materials Research 347-353 (October 2011): 2245–48. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.2245.

Full text

Abstract:

In this paper, the effects of operating parameters such as UV light wavelength, initial pH, reaction temperature and hydrogen peroxide concentration on decolorization of metal complex dyes (Neutral Bordeaux GRL, Neutral Pink BL and Neutral Blue BNL) by UV/H2O2process were studied in detail. The results showed that the decolorization rate constants were obviously enhanced with the increase of UV intensity. In UV (254nm)/H2O2system, 94.4% decolorization of Neutral Bordeaux GRL, 99.2% decolorization of Neutral Pink BL and 65.4% decolorization of Neutral Blue BNL were achieved after 60 min reaction. The results also indicated that both suitable amount of H2O2and initial pH were needed for effective decolorization of different metal complex dyes. The reaction activation energy of Neutral Bordeaux GRL, Neutral Pink BL and Neutral Blue BNL were 3.43, 14.4 and 23.39 KJ mol-1, respectively.

APA, Harvard, Vancouver, ISO, and other styles

12

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

13

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

14

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

15

Yang, Bing, Qiuping Luo, Qinman Li, Yuan Meng, Li Lingli, and Yucheng Liu. "Selective oxidation and direct decolorization of cationic dyes by persulfate without activation." Water Science and Technology 83, no. 11 (May 6, 2021): 2744–52. http://dx.doi.org/10.2166/wst.2021.177.

Full text

Abstract:

Abstract The aim of this work was to investigate the selective oxidation and direct decolorization of selected organic dyes (Methylene Blue (MB), Rhodamine B (RhB) and Orange II (OrgII)) by persulfate (PDS) without activation. Results show that the decolorization rate of MB was up to 58.0% within 10 minutes, while those of RhB and OrgII were only about 29.6% and 3.0% after 80 minutes, respectively. In comparison with the negligible impacts of pH from 2.0 to 9.0 on MB and OrgII decolorization, RhB decolorization rate obviously varied with the pH changes, and acid pH condition was beneficial for RhB decolorization. Quenching tests implied that the decolorization of dyes by PDS without activation was a nonradical oxidation process rather than sulfate radical oxidation. A plausible mechanism is that the decolorization process is attributed to the charged states of the dyes at different pH conditions, and thus direct electron transfer from dyes to PDS may occur, which is responsible for the bleaching of dyes. This study points out the potential bleaching capability of PDS without activation on cationic dyes, which may have important implications for selective oxidation treatment of dye wastewater.

APA, Harvard, Vancouver, ISO, and other styles

16

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

17

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

18

Pham, Van Thi Bich, Hao Minh Hoang, Thuy Thi Thanh Nguyen, and Xuan Thi Hong Cao. "Decolorization of textile dyes by TiO2 -based photocatalyst using polyol as electron donor." Science and Technology Development Journal - Natural Sciences 2, no. 5 (July 2, 2019): 83–89. http://dx.doi.org/10.32508/stdjns.v2i5.782.

Full text

Abstract:

Decolorization of textile dyes including 2,6-dichlorophenolindophenol (DCIP), congo red (CR) and methyl orange (MO) by using TiO2-based photocatalyst in the presence of polyols such as glycerol and ethylene glycol was investigated. Polyols were used as sacrificial electron donors (SEDs). The results showed that the polyols improved the rate and yield of a light-induced decolorization of dyes in comparison with a photocatalytic reaction without polyols. A possible reaction mechanism of dye decolorization by the photocatalyst in the presence of electron donors was proposed. TiO2 photocatalyst absorbed light to generate electrons (e-) and holes (h+). The electrons and holes were prevented from recombining by the presence of SEDs. The free electrons and holes then involved in decolorization processes through reduction or oxidation reactions. The effects of TiO2 catalyst amounts, irradiation time and polyol concentrations on dye decolorization were investigated. The decolorization efficiency significantly increased with the increasing irradiation time, SED concentrations and certain amounts of TiO2.

APA, Harvard, Vancouver, ISO, and other styles

19

Neifar, Mohamed, Atef Jaouani, Amel Kamoun, Raoudha Ellouze-Ghorbel, and Semia Ellouze-Chaabouni. "Decolorization of Solophenyl Red 3BL Polyazo Dye by Laccase-Mediator System: Optimization through Response Surface Methodology." Enzyme Research 2011 (August 2, 2011): 1–8. http://dx.doi.org/10.4061/2011/179050.

Full text

Abstract:

The decolorization of direct Solophenyl red 3BL (SR), a polyazo dye extensively used in textile industry was studied. The Fomes fomentarius laccase alone did not decolorize SR. The natural redox mediator, acetosyringone (AS), was necessary for decolorization to occur. Box-Behnken design was used to evaluate the effects of three parameters, namely, enzyme concentration (0.5–2.5 U mL−1), redox mediator concentration (3–30 μM), and incubation time (1–24 h), on the SR decolorization yield. The fitted mathematical model allowed us to plot response surfaces as well as isoresponse curves and to determine optimal decolorization conditions. The results clearly indicated that the AS concentration was the main factor influencing the SR decolorization yield. The selected optimal conditions were enzyme concentration 0.8 U mL−1, mediator concentration 33 μM, and time 14 h 30 min. These conditions allowed 79.66% of SR decolorization versus 80.70% for the predicted value. These results showed a promising future of applying laccase-AS system for industrial wastewater bioremediation.

APA, Harvard, Vancouver, ISO, and other styles

20

Didar Değermenci, Gökçe. "Decolorization of reactive azo dye by fenton and photo-fenton processes in aqueous solution: The influence of operating conditions, kinetics study, and performance comparison." Bulletin of the Chemical Society of Ethiopia 37, no. 1 (October 26, 2022): 197–210. http://dx.doi.org/10.4314/bcse.v37i1.16.

Full text

Abstract:

ABSTRACT. In this study, the effect of Fenton and photo-Fenton processes, which are advanced oxidation processes that use the hydroxyl radical for the decolorization of Novacron Black from aqueous solutions, on decolorization was investigated. Optimum levels of initial pH, temperature, hydrogen peroxide concentration, initial dyestuff concentration, and iron concentration were determined. Initial pH, Fe2+ concentration, temperature, and initial Novacron Black concentration are the most effective experimental parameters in the decolorization of Novacron Black with Fenton and photo-Fenton processes. While the Novacron Black concentration was 200 mg/L, the H2O2 concentration was 100 mg/L, the initial solution pH was 3, and the temperature was 20 °C, a decolorization efficiency of 82.1% was obtained in the Fenton process at a concentration of 5 mg/L Fe2+, while in the photo-Fenton process at a 2 mg/L Fe2+ concentration, a 94.6% decolorization efficiency was obtained. Upon decolorization of Novacron Black, the photo-Fenton process had a higher removal efficiency than the Fenton process, even at low iron concentrations. From data obtained at various concentrations of initial Novacron Black, the non-linear method was used to determine the decolorization kinetics of Novacron Black. Finally, an economic analysis was carried out to compare the differences in operating costs between Fenton and photo-Fenton processes. KEY WORDS: Advanced oxidation process, Decolorization, Fenton oxidation, Kinetic model, Photo-Fenton oxidation Bull. Chem. Soc. Ethiop. 2023, 37(1), 197-210. DOI: https://dx.doi.org/10.4314/bcse.v37i1.16

APA, Harvard, Vancouver, ISO, and other styles

21

Zhao, Rui, Tianshan Liu, Jun Xiao, Daniel P. K. Lun, and Kin-Man Lam. "Invertible Image Decolorization." IEEE Transactions on Image Processing 30 (2021): 6081–95. http://dx.doi.org/10.1109/tip.2021.3091902.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Ancuti, Cosmin, Codruta O. Ancuti, Christophe De Vleeschouwer, and Mateu Sbert. "Decolorization by Fusion." IEEE Access 6 (2018): 64071–84. http://dx.doi.org/10.1109/access.2018.2876373.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Hao, Oliver J., Hyunook Kim, and Pen-Chi Chiang. "Decolorization of Wastewater." Critical Reviews in Environmental Science and Technology 30, no. 4 (October 2000): 449–505. http://dx.doi.org/10.1080/10643380091184237.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

27

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

28

Rohmah, A. A., A. S. Purnomo, and Asranudin. "The Addition of Different Adsorbents In SA-PVA Matrix For Bacillus Subtilis Immobilization on Methylene Blue Decolorization." IOP Conference Series: Earth and Environmental Science 995, no. 1 (April 1, 2022): 012046. http://dx.doi.org/10.1088/1755-1315/995/1/012046.

Full text

Abstract:

Abstract Wastewater which is not handled by a proper treatment before released in the water body, can cause damage for aquatic biota and its environment. MB is a synthetic textile dye which is toxic and difficult to degrade. Bioremediation by decolorization using microbes such as bacteria is one of the best methods for dye removal. By immobilizing Bacillus subtilis bacterium in an appropriate matrix, it could have more advantage on dye decolorization than by free cell only. The sodium alginate (SA) and polyvinyl alcohol (PVA) are well known as good matrix for decolorization. Besides the addition of B. subtilis in the SA-PVA matrix, the addition of adsorbents could enhance the decolorization. In this study, different adsorbents: bentonite, activated charcoal, kaolin, and corncob powder were investigated for influencing MB decolorization by immobilized B. subtilis in SA-PVA matrix. The result showed that the highest MB decolorization was reached by SA-PVA-B. subtilis with the presence of activated charcoal by approximately 88% of 100 mg/L, followed by the addition of bentonite (82%), kaolin (80%), and corncob powder (79%). The MB decolorization by SA-PVA-Activated charcoal-B. subtilis reached optimum condition at temperature 35 °C, 24 h incubation time in static condition.

APA, Harvard, Vancouver, ISO, and other styles

29

Liu, Zheng Qin, Lei Tan, Yue Li, and Dan Li Xi. "Decolorization of Textile Wastewater Using Modified Facultative Anaerobic Baffled Reactor." Advanced Materials Research 627 (December 2012): 386–89. http://dx.doi.org/10.4028/www.scientific.net/amr.627.386.

Full text

Abstract:

The study deals with a wastewater treatment system which is combination of modified facultative anaerobic baffled reactor (MFABR) and an aerobic unit. The efficient decolorization and biological degradation of the wastewater that contains commercially important cationic red 2GL (azo) in the MFABR under facultative anaerobic conditions are the research focuses. The results indicate that over 95.2% decolorization and about 54.6% COD removal efficiency can be obtained in MFABR. High dye concentration (500 mg/L) still results in over 90.6% decolorization efficiency. The main characteristics of the process are highly efficient decolorization in MFABR and greatly reducing COD in aerobic unit.

APA, Harvard, Vancouver, ISO, and other styles

30

Moreira, María Teresa, César Viacava, and Gladys Vidal. "Fed-batch decolorization of Poly R-478 by Trametes versicolor." Brazilian Archives of Biology and Technology 47, no. 2 (June 2004): 179–83. http://dx.doi.org/10.1590/s1516-89132004000200003.

Full text

Abstract:

Physiological aspects were evaluated to determine optimal conditions for the decolorization of a synthetic dye, Poly R-478, by white-rot fungus Trametes versicolor # 52J. The decolorization experiments were carried out in semicontinuous operation during three cycles to improve the process efficiency. The best decolorization efficiencies (65% to 80%) were obtained in fungal cultures performed in nitrogen limited conditions under aerobic conditions.

APA, Harvard, Vancouver, ISO, and other styles

31

Wang, Xuxu, Xuebin Hu, Chun Zhao, Zhihua Sun, Huaili Zheng, Junfeng Li, and Zhaoyang Wang. "Optimization and mechanism of Acid Orange 7 removal by powdered activated carbon coupled with persulfate by response surface method." Water Science and Technology 79, no. 6 (March 15, 2019): 1195–205. http://dx.doi.org/10.2166/wst.2019.117.

Full text

Abstract:

Abstract In this study, powder activated carbon (PAC) utilized to activate peroxydisulfate (PDS) was investigated for decolorization of Acid Orange 7 (AO7). The results indicated a remarkable synergistic effect in the PAC/PDS system. The effect of PAC, PDS dosages and initial pH on AO7 decolorization were studied and the processes followed first-order kinetics. Response surface method with central composite design (CCD) model was utilized to optimize these three factors and analyze the combined interaction. The optimum condition for the decolorization rate of AO7 was analyzed as the following: PAC (0.19 g/L), PDS (1.64 g/L), and initial pH (4.14). Cl− and SO42− showed a promoting effect on AO7 decolorization while HCO3− had a slightly inhibiting effect. Quenching experiments confirmed that both sulfate and hydroxyl radicals were the oxidizing species, and the oxidation reaction occurred on the surface of PAC. The results of UV-vis spectrum with 100% decolorization rate and the 50% total organic carbon reduction indicated highly efficient decolorization and mineralization of AO7 in the PAC/PDS system. Finally, the recovery performance of PAC was studied and the result indicated PAC had poor reuse in reactivity.

APA, Harvard, Vancouver, ISO, and other styles

32

Chantarasiri, Aiya. "Klebsiella and Enterobacter Isolated from Mangrove Wetland Soils in Thailand and Their Application in Biological Decolorization of Textile Reactive Dyes." International Journal of Environmental Research and Public Health 17, no. 20 (October 16, 2020): 7531. http://dx.doi.org/10.3390/ijerph17207531.

Full text

Abstract:

Wastewater released from textile and dye-based industries is one of the major concerns for human and aquatic beings. Biological decolorization using ligninolytic bacteria has been considered as an effective and alternative approach for the treatment of dyeing wastewater. This study aimed to assess the isolation, characterization and application of soil bacteria isolated from mangrove wetlands in Thailand. Four active bacteria were genetically identified and designated as Klebsiella pneumoniae strain RY10302, Enterobacter sp. strain RY10402, Enterobacter sp. strain RY11902 and Enterobacter sp. strain RY11903. They were observed for ligninolytic activity and decolorization of nine reactive dyes under experimental conditions. All bacteria exhibited strong decolorization efficiency within 72 h of incubation at 0.01% (w/v) of reactive dyes. The decolorization percentage varied from 20% (C.I. Reactive Red 195 decolorized by K. pneumoniae strain RY10302) to 92% (C.I. Reactive Blue 194 decolorized by Enterobacter sp. strain RY11902) in the case of bacterial monoculture, whereas the decolorization percentage for a mixed culture of four bacteria varied from 58% (C.I. Reactive Blue 19) to 94% (C.I. Reactive Black 1). These findings confer the possibility of using these bacteria for the biological decolorization of dyeing wastewater.

APA, Harvard, Vancouver, ISO, and other styles

33

Wulandari, Fitriya Yuni, Nuniek Ina Ratnaningtyas, and Ratna Stia Dewi. "DEKOLORISASI LIMBAH BATIK MENGGUNAKAN LIMBAH MEDIUM TANAM Pleurotus ostreatus PADA WAKTU INKUBASI YANG BERBEDA." Scripta Biologica 1, no. 1 (March 25, 2014): 73. http://dx.doi.org/10.20884/1.sb.2014.1.1.29.

Full text

Abstract:

The batik waste industry is one source of water pollution. It must undergo treatment before discharge into the environment. Batik waste treatment technologies can be done biologically, chemically, physically, or combination of three processes. This research applied a combination of biology and physic technologies, namely used spent mushroom of Pleurotus ostreatus as the decolorization agent. Mycelium of P. ostreatus was used as biological agent, and cellulose from spent mushroom was used as physical agent. The aims of this research were to determine the effect of spent mushroom with variation incubation time on batik waste decolorization, and to know the optimum incubation time with highest decolorization batik waste percentage using spent mushroom of P. ostreatus. This research used experimental method with completely randomized design (CRD). The data obtained were statistically analyzed using Varian Test (ANOVA) on confidence level of 95% and 99% and continued with Honest Significant Difference Test (BNJ) with 95% confidence level. The result showed that variation incubation time treatment of batik waste decolorization used spent mushroom of P. ostreatus provide a highly signification effect on batik waste decolorization. The optimum incubation time was 60 hour (LW5), with decolorization percentage was 85,64%.

APA, Harvard, Vancouver, ISO, and other styles

34

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

35

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

36

Yang, Aili, Chinpao Huang, Bingqing Wei, and Zhengjun Zhang. "Facile decolorization of methylene blue with flower-like manganese wads." Water Science and Technology 69, no. 5 (January 21, 2014): 1094–100. http://dx.doi.org/10.2166/wst.2014.031.

Full text

Abstract:

Flower-like manganese wads (MWs) were synthesized via a simple and inexpensive ultrasonic irradiation method for the first time. MWs were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray and transmission electronic microscopy. The decolorization efficiency of MWs for methylene blue (MB) azo dye was examined as a function of pH, stirring time, MW dosage and initial concentration of the MB solution. Results show that MWs have excellent decolorization performance for MB with a higher efficiency (and without using H2O2 or other devises such as UV light and ultrasonic irradiation) compared to other catalysts, such as the mixture of Mn3O4 and H2O2 (with a maximum decolorization rate of 99.7% in 3 h), ZnS and CdS under light irradiation (with a maximum decolorization rate of 73% in 6 h), and sulfate modified titania under solar radiation (with a maximum decolorization rate of nearly 100% in 4 h).

APA, Harvard, Vancouver, ISO, and other styles

37

Eichlerová, Ivana, and Petr Baldrian. "Ligninolytic Enzyme Production and Decolorization Capacity of Synthetic Dyes by Saprotrophic White Rot, Brown Rot, and Litter Decomposing Basidiomycetes." Journal of Fungi 6, no. 4 (November 19, 2020): 301. http://dx.doi.org/10.3390/jof6040301.

Full text

Abstract:

An extensive screening of saprotrophic Basidiomycetes causing white rot (WR), brown rot (BR), or litter decomposition (LD) for the production of laccase and Mn-peroxidase (MnP) and decolorization of the synthetic dyes Orange G and Remazol Brilliant Blue R (RBBR) was performed. The study considered in total 150 strains belonging to 77 species. The aim of this work was to compare the decolorization and ligninolytic capacity among different ecophysiological and taxonomic groups of Basidiomycetes. WR strains decolorized both dyes most efficiently; high decolorization capacity was also found in some LD fungi. The enzyme production was recorded in all three ecophysiology groups, but to a different extent. All WR and LD fungi produced laccase, and the majority of them also produced MnP. The strains belonging to BR lacked decolorization capabilities. None of them produced MnP and the production of laccase was either very low or absent. The most efficient decolorization of both dyes and the highest laccase production was found among the members of the orders Polyporales and Agaricales. The strains with high MnP activity occurred across almost all fungal orders (Polyporales, Agaricales, Hymenochaetales, and Russulales). Synthetic dye decolorization by fungal strains was clearly related to their production of ligninolytic enzymes and both properties were determined by the interaction of their ecophysiology and taxonomy, with a more relevant role of ecophysiology. Our screening revealed 12 strains with high decolorization capacity (9 WR and 3 LD), which could be promising for further biotechnological utilization.

APA, Harvard, Vancouver, ISO, and other styles

38

Ben Ayed, Amal, Bilel Hadrich, Giuliano Sciara, Anne Lomascolo, Emmanuel Bertrand, Craig B. Faulds, Héla Zouari-Mechichi, Eric Record, and Tahar Mechichi. "Optimization of the Decolorization of the Reactive Black 5 by a Laccase-like Active Cell-Free Supernatant from Coriolopsis gallica." Microorganisms 10, no. 6 (May 31, 2022): 1137. http://dx.doi.org/10.3390/microorganisms10061137.

Full text

Abstract:

The textile industry generates huge volumes of colored wastewater that require multiple treatments to remove persistent toxic and carcinogenic dyes. Here we studied the decolorization of a recalcitrant azo dye, Reactive Black 5, using laccase-like active cell-free supernatant from Coriolopsis gallica. Decolorization was optimized in a 1 mL reaction mixture using the response surface methodology (RSM) to test the influence of five variables, i.e., laccase-like activity, dye concentration, redox mediator (HBT) concentration, pH, and temperature, on dye decolorization. Statistical tests were used to determine regression coefficients and the quality of the models used, as well as significant factors and/or factor interactions. Maximum decolorization was achieved at 120 min (82 ± 0.6%) with the optimized protocol, i.e., laccase-like activity at 0.5 U mL−1, dye at 25 mg L−1, HBT at 4.5 mM, pH at 4.2 and temperature at 55 °C. The model proved significant (ANOVA test with p < 0.001): coefficient of determination (R²) was 89.78%, adjusted coefficient of determination (R²A) was 87.85%, and root mean square error (RMSE) was 10.48%. The reaction conditions yielding maximum decolorization were tested in a larger volume of 500 mL reaction mixture. Under these conditions, the decolorization rate reached 77.6 ± 0.4%, which was in good agreement with the value found on the 1 mL scale. RB5 decolorization was further evaluated using the UV-visible spectra of the treated and untreated dyes.

APA, Harvard, Vancouver, ISO, and other styles

39

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

40

Zhang, Zhen Fa, Guang Shan Mu, Jin Yun Peng, Meng Zhou, Hao Wen, and Xiao Lin Zhang. "Study on Decolorization of Sugar Cane Juice Using Activated Carbons." Advanced Materials Research 529 (June 2012): 376–79. http://dx.doi.org/10.4028/www.scientific.net/amr.529.376.

Full text

Abstract:

Sugar cane juice decolorization was studied using four commercial activated carbons. In an attempt to relate decolorizing performances to the characteristics, reaction time and temperature, the color removal capabilities of activated carbons were measured. The four commercial activated carbons showed different decolorization efficiencies, which could be related to their physical and chemical properties. The decolorization efficiency of powdered activated carbon was much better than the others.

APA, Harvard, Vancouver, ISO, and other styles

41

Lopez-Barbosa, Natalia, Sergio Leonardo Florez, Juan C. Cruz, Nancy Ornelas-Soto, and Johann F. Osma. "Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors." Nanomaterials 10, no. 6 (June 24, 2020): 1227. http://dx.doi.org/10.3390/nano10061227.

Full text

Abstract:

Removal of azo and diazo dye content from textile industry wastewaters is crucial due to their environmental impact. Here, we report on the use of the fungal laccase from Pycnoporus sanguineus CS43 immobilized on silica nanoparticles and entrapped in textile-based filters for the degradation of Congo Red. Laccase immobilization and synthesis of the nanocomposites were carried out by two different methods, one in the presence of acetone and the second using water as solvent. This led to a change in the hydrophobicity of the obtained biofilters. Successful preparation of the nanocomposites was confirmed via FTIR spectroscopy. Changes in the secondary structure of the enzyme were inspected through the second derivative of the FTIR spectra. Six different types of filter were fabricated and tested in a continuous flow bioreactor in terms of their decolorization capabilities of Congo Red. The results indicate removal efficiencies that approached 40% for enzymes immobilized on the more hydrophobic supports. Backscattered electron (BSE) images of the different filters were obtained before and after the decolorization process. Percentage of decolorization and activity loss were determined as a function of time until a plateau in decolorization activity was reached. Experimental data was used to recreate the decolorization process in COMSOL Multiphysics® (Stockholm, Sweden). These simulations were used to determine the proper combination of parameters to maximize decolorization. Our findings suggest that the treatment of textile-based filters with immobilized laccase in conjunction with hydrophobic nanocomposites provides a suitable avenue to achieve more efficient laccase dye decolorization (39%) than that obtained with similar filters treated only with free laccase (8%). Filters treated with silica-based nanocomposites and immobilized laccases showed an increase in their decolorization capability, probably due to changes in their wetting phenomena.

APA, Harvard, Vancouver, ISO, and other styles

42

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

43

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

44

Yue, Jun Jie, Xing Long Jin, and Zhao Hui Jin. "Study on Decolorization of Wastewater Containing Acid Orange II by Adsorption on Expanded Graphite." Advanced Materials Research 183-185 (January 2011): 873–76. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.873.

Full text

Abstract:

In this paper, the adsorption and decolorization capability of expanded graphite (EG) on the simulated wastewater containing Acid Orange Ⅱwere studied. The experimental results show that the initial concentration of wastewater, the dosage of EG, the pH value and the temperature all have greater effects on the decolorization ratio of simulated Acid Orange Ⅱ wastewater. The dye- wastewater containing lower concentration(＜150 mg/L) of Acid Orange Ⅱ is more suitable to be treated by EG, and approximately 100 mg/L is the preferable concentration. The decolorization ratio increases with the increment of the dosage of EG and the temperature level, but the growth rate obviously decreases at the higher initial concentration. All the decolorization ratios under strong acidic (pH<5) and alkalic (pH>11) conditions are higher than that at the range of 5-11 pH values, the highest value even reaches over 94%, while the decolorization ratio under the latter conditions are only between 75% and 85%.

APA, Harvard, Vancouver, ISO, and other styles

45

Chen, Ming, Chun Zhi Zhang, Yan Shen, and Guo Ren Zu. "Decolorization of Reactive Brilliant Blue KN-R by Immobilized Cells of Rhodocyclus gelatinosus." Advanced Materials Research 610-613 (December 2012): 9–14. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.9.

Full text

Abstract:

Reactive Brilliant Blue KN-R is a typical kind of anthraquinone dye and in common use in textile, dyeing, and printing industries in China, which is difficult to degrade because of its conjugated structure. The decolorization of KN-R was investigated using Ca-alginate immobilized cells of Rhodocyclus gelatinosus XL-1 under anaerobic conditions. For KN-R decolorization by immobilized cells, the suitable pH is 5-8 and the suitable temperature is 25-40 °C. Immobilized cells could decolorize KN-R by co-metabolism in the presence of peptone, and the enhancement of peptone concentration was beneficial for anaerobic decolorization. Metal ions affected the metabolic activity of immobilized cells of R. gelatinosus XL-1. The activity of KN-R decolorization was appreciably increased by Mg2+ and Cr3+, but severely inhibited by Cu2+ and Ag+. The maximum absorption peak in visible spectrum shifted from 595 to 453 nm during KN-R decolorization, indicating the formation of the intermediate product.

APA, Harvard, Vancouver, ISO, and other styles

46

Behzat, Balci. "Decolorization of Reactive Black 39 and Acid Red 360 by Pseudomonas aeruginosa." Water Science and Technology 72, no. 8 (July 6, 2015): 1266–73. http://dx.doi.org/10.2166/wst.2015.342.

Full text

Abstract:

The aim of this work is to evaluate decolorization of Reactive Black 39 (RB39) and Acid Red 360 (AR360) by Pseudomonas aeruginosa, which was isolated from a non-dye-contaminated activated sludge biomass. In the present study, the effect of various physicochemical parameters, initial dye concentration, temperature, pH, inoculum size and yeast extract concentration as an organic source on decolorization were investigated. P. aeruginosa was able to decolorize 20 mg/L RB39 completely within 144 hours in the presence of 0.5 g/L yeast extract at 25°C. Decolorization efficiencies for AR360 were found to be higher than RB39 under the same conditions. Optimal temperature to decolorize RB39 and AR360 was found to be 30 and 25°C, respectively. The activation energy (Ea) values for decolorization of RB39 and AR360 were found to be 61.89 kJ/mol and 81.18 kJ/mol, respectively. Experience showed that the pH and inoculum size had a considerable effect on decolorization of RB39 and AR360 by P. aeruginosa.

APA, Harvard, Vancouver, ISO, and other styles

47

Zha, Yiming, and Tianlin Wang. "Boron nitride nanoplates supported zero-valent iron nanocomposites for enhanced decolorization of methyl orange with the assistance of ultrasonic irradiation." Water Science and Technology 73, no. 2 (September 28, 2015): 329–36. http://dx.doi.org/10.2166/wst.2015.497.

Full text

Abstract:

In this work, boron nitride nanoplates (BNNPs) supported nanoscale zero-valent iron (nZVI) was prepared through facile liquid-phase chemical reduction of ferric ion by borohydride under ambient conditions in the presence of BNNPs. The nZVI@BNNPs hybrids were characterized by scanning electron microscopy, X-ray diffraction and magnetic properties measurement. The hybrid material was evaluated for decolorization of a common azo dye, methyl orange (MO), with the assistance of ultrasonic irradiation. Results exhibited that a complete decolorization of 100 mg/L MO was achieved within 6 min using nZVI@BNNPs as the active material. Compared with bare nZVI and BNNPs, nZVI@BNNPs provided a faster reaction process for MO decolorization. The kinetic rate constants of MO decolorization reached 0.8175 min−1 under ultrasound-assisted condition due to the synergistic effect of ultrasonic irradiation. Fluorescence spectrum experiment confirmed that hydroxyl radicals could be generated in the system combined nZVI with ultrasonic irradiation, and as a result, hydroxyl radicals would contribute to the decolorization process of MO.

APA, Harvard, Vancouver, ISO, and other styles

48

Wu, Wen Tung. "The Decolorization Property of Azo Dyes Using a Tsukamurella Sp. J8025 Isolated from Activated Sludge." Advanced Materials Research 233-235 (May 2011): 2909–12. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.2909.

Full text

Abstract:

A Tsukamurella sp. J8025 with the capability of removing the synthetic dyes (methyl orange) was isolated from activated sludge. The strain J8025 grew well in aerobic and semi-aerobic condition, but the best decolorization was in semi-aerobic culture (static condition). For the optimal decolorization, the most suitable pH and temperature were pH 6.0 and 30°C. More than 80% of methyl orange was decolorized in the LB medium within 4 days of incubation. The decolorization rate could be strongly promoted to over 90% in LB media with glucose within 2 days of incubation. This probability of reason for the consumed glucose as the best energy source was to enhance the cell growth and decolorization activity.

APA, Harvard, Vancouver, ISO, and other styles

49

Zhou, Yu Ping, Qiong Hua Chen, Hui Zhen Cheng, Lin Gui, Li Li Sun, De Zhu Lei, De Sen Ke, and Chang En Tian. "Decolorization of Indigo Carmine by Ganoderma weberianum." Advanced Materials Research 183-185 (January 2011): 1035–40. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.1035.

Full text

Abstract:

Many natural and synthetic dyes present in industrial effluents are resistant to degradation by conventional treatments. Decolorization of indigo carmine were carried out using a newly isolated ligninolytic fungus strain Ganoderma weberianum TZC1. This strain was shown to decolorize indigo carmine efficiently; the optimal pH and temperature were pH 5.0 and 33°C. A decolorization efficiency of 93% was achieved by cultivation for 1 h at an initial dye concentration of 20 mg/L. Furthermore, G. weberianum was shown to be used efficiently and repeatedly in repeated-batch decolorization operations with the mycelia pellets at the different ages. Our results suggest that G. weberianum has promising applications in dye-containing wastewater decolorization.

APA, Harvard, Vancouver, ISO, and other styles

50

Zhang, Hui, Hong Gao, Chun Cai, Chunyang Zhang, and Lu Chen. "Decolorization of Crystal Violet by ultrasound/heterogeneous Fenton process." Water Science and Technology 68, no. 11 (October 25, 2013): 2515–20. http://dx.doi.org/10.2166/wst.2013.539.

Full text

Abstract:

Activated-carbon-supported iron oxides were prepared and used as a catalyst in an integrated ultrasound/heterogeneous Fenton process for the decolorization of Crystal Violet. A synergistic effect was observed when ultrasound was combined with the heterogeneous Fenton process. The decolorization efficiency increased with the increasing power density and catalyst dosage, but decreased with the increase of initial pH value. There exists an optimal hydrogen peroxide concentration for decolorization. Catalyst stability was evaluated by measuring iron leaching in solution. The decolorization efficiency was 88% under the optimal conditions. Toxicity test with Daphnia magna showed that the acute toxicity of dye solution decreased significantly after the treatment by the heterogeneous sono-Fenton process.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Decolorization'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles