scholarly journals Catalytic Activity of Porous Phosphate Heterostructures-Fe towards Reactive Black 5 Degradation

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Marco S. Lucas ◽  
Manuel Algarra ◽  
José Jiménez-Jiménez ◽  
Enrique Rodríguez-Castellón ◽  
José A. Peres
Keyword(s):  
Catalytic Activity ◽  
Economic System ◽  
Azo Dyes ◽  
Azo Dye ◽  
Reactive Black 5 ◽  
Heterogeneous Process ◽  
Fenton’S Reaction ◽  
Mild Conditions ◽  
Simulated Wastewater ◽  
Porous Phosphate

Fenton’s reaction is often used to decompose stable substances in wastewater. In this study, experiments based on the effect of porous phosphate heterostructures as catalyst sorbent of Fe2+synthesised by different procedures were planned. The examined PPH-Fe/H2O2as oxidant in a heterogeneous process under mild conditions at pH 5 was found to be very efficient for discoloration of a simulated wastewater containing 50 mg L−1of a commercial azo dye (Reactive Black 5) reaching 95% of decolourization. Under the described conditions total visual decolourization was achieved after 360 min. This study can provide a simple, effective, and economic system ideal for the treatment of toxic and nonbiodegradable azo dyes.

scholarly journals Magnetically retrievable Ce-doped Fe3O4 nanoparticles as scaffolds for the removal of azo dyes

RSC Advances ◽  
2019 ◽  
Vol 9 (40) ◽  
pp. 23129-23141 ◽  
Author(s):  
Aashima Aashima ◽  
Shivani Uppal ◽  
Arushi Arora ◽  
Sanjeev Gautam ◽  
Suman Singh ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Fe3o4 Nanoparticles ◽  
Azo Dye ◽  
Reactive Black 5

Considering the significant impact of magnetically retrievable nanostructures, herein, Ce-doped Fe3O4 nanoparticles were employed as scaffolds for the removal of the Reactive Black 5 (RB5), an azo dye.

scholarly journals Investigating degradation metabolites and underlying pathway of azo dye “Reactive Black 5” in bioaugmented floating treatment wetlands

2021 ◽  
Author(s):  
Nain Tara ◽  
Mazhar Iqbal ◽  
Fazale Habib ◽  
Qaiser Mahmood Khan ◽  
Samina Iqbal ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Azo Dye ◽  
Dye Degradation ◽  
Treatment Wetlands ◽  
Reactive Black 5 ◽  
Acinetobacter Junii ◽  
Degrading Bacteria ◽  
Carcinogenic Effects ◽  
Successful Removal ◽  
Floating Treatment Wetlands

Abstract The direct discharge of azo dyes and/or their metabolites into the environment may exert toxic, mutagenic, and carcinogenic effects on exposed fauna and flora. In this study, we analyzed the metabolites produced during the degradation of an azo dye namely Reactive Black 5 (RB5) in the bacterial augmented-floating treatment wetlands (FTWs), followed by the investigation of their underlying toxicity. To this end, a FTWs system was developed by using a common wetland plant Phragmites australis in the presence of three dye-degrading bacteria (Acinetobacter junii strain NT-15, Pseudomonas indoloxydans strain NT-38, and Rhodococcus sp. strain NT-39). We found that the FTW system effectively degraded RB5 into at least 20 different metabolites with the successful removal of color (95.5%) from the water. The fish toxicity assay revealed the non-toxic characteristics of the metabolites produced after dye degradation. Our study suggests that bacterially aided FTWs could be a suitable option for the successful degradation of azo dyes, and the results presented in this study may help improve the overall textile effluent clean-up processes.

scholarly journals Cationic High Molecular Weight Lignin Polymer: A Flocculant for the Removal of Anionic Azo-Dyes from Simulated Wastewater

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 2005 ◽  
Author(s):  
Shoujuan Wang ◽  
Fangong Kong ◽  
Pedram Fatehi ◽  
Qingxi Hou
Keyword(s):  
Molecular Weight ◽  
Azo Dyes ◽  
Textile Industry ◽  
Dye Removal ◽  
Complex Structure ◽  
Marginal Effect ◽  
Reactive Black 5 ◽  
Reactive Orange 16 ◽  
Simulated Wastewater ◽  
Reactive Orange

The presence of dyes in wastewater effluents made from the textile industry is a major environmental problem due to their complex structure and poor biodegradability. In this study, a cationic lignin polymer was synthesized via the free radical polymerization of lignin with [2-(methacryloyloxy) ethyl] trimethyl ammonium chloride (METAC) and used to remove anionic azo-dyes (reactive black 5, RB5, and reactive orange 16, RO16) from simulated wastewater. The effects of pH, salt, and concentration of dyes, as well as the charge density and molecular weight of lignin-METAC polymer on dye removal were examined. Results demonstrated that lignin-METAC was an effective flocculant for the removal of dye via charge neutralization and bridging mechanisms. The dye removal efficiency of lignin-METAC polymer was independent of pH. The dosage of the lignin polymer required for reaching the maximum removal had a linear relationship with the dye concentration. The presence of inorganic salts including NaCl, NaNO3, and Na2SO4 had a marginal effect on the dye removal. Under the optimized conditions, greater than 98% of RB5 and 94% of RO16 were removed at lignin-METAC concentrations of 120 mg/L and 105 mg/L in the dye solutions, respectively.

scholarly journals Cationic High Molecular Weight Lignin Polymer: A Flocculant for the Removal of Anionic Azo-Dyes from Simulated Wastewater

2018 ◽  
Author(s):  
Shoujuan Wang ◽  
Fangong Kong ◽  
Pedram Fatehi ◽  
Qingxi Hou
Keyword(s):  
Molecular Weight ◽  
Azo Dyes ◽  
Textile Industry ◽  
Dye Removal ◽  
Complex Structure ◽  
Marginal Effect ◽  
Reactive Black 5 ◽  
Trimethylammonium Chloride ◽  
Reactive Orange 16 ◽  
Simulated Wastewater

The presence of dyes in wastewater effluents made from the textile industry is a major environmental problem due to their complex structure and poor biodegradability. In this study, a cationic lignin polymer was synthesized via the free radical polymerization of lignin with [2- (methacryloyloxy) ethyl] trimethylammonium chloride (METAC) and used to remove anionic azo-dyes (reactive black 5, RB5, and reactive orange 16, RO16) from simulated wastewater. The effects of pH, salt and concentration of dyes, well as the charge density and molecular weight of lignin-METAC polymer on dye removal were examined. Results demonstrated that lignin-METAC was an effective flocculant for the removal of dye via charge neutralization and bridging mechanisms. The dye removal efficiency of lignin-METAC polymer was independent of pH. The dosage of the lignin polymer required for reaching the maximum removal had a linear relationship with the dye concentration. The presence of inorganic salts including NaCl, NaNO3 and Na2SO4 had marginal effect on the dye removal. Under the optimized conditions, greater than 98 % of RB5 and 94 % of RO16 were removed at lignin-METAC concentrations of 120 mg/L and 105 mg/L in the dye solutions, respectively.

Facile synthesis of a Ag(i)-doped coordination polymer with enhanced catalytic performance in the photodegradation of azo dyes in water

2015 ◽  
Vol 3 (11) ◽  
pp. 5908-5916 ◽  
Author(s):  
Fan Wang ◽  
Fu-Ling Li ◽  
Miao-Miao Xu ◽  
Hong Yu ◽  
Jian-Guo Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Coordination Polymer ◽  
Azo Dyes ◽  
Azo Dye ◽  
Catalytic Performance ◽  
Facile Synthesis

Immersing {[Pb(Tab)2(bpe)]2(PF6)4}n into AgNO3 solution produced a Ag(i)-doped coordination polymer {[Pb(Tab)2(bpe)]2(PF6)4·1.64AgNO3}n, which enhanced the catalytic activity towards azo dye photodegradation.

scholarly journals Effect of Reactive Black 5 azo dye on soil processes related to C and N cycling

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4802 ◽  
Author(s):  
Khadeeja Rehman ◽  
Tanvir Shahzad ◽  
Amna Sahar ◽  
Sabir Hussain ◽  
Faisal Mahmood ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Soil Respiration ◽  
Azo Dyes ◽  
Azo Dye ◽  
Reactive Black 5 ◽  
Synthetic Dyes ◽  
Inorganic N ◽  
Soil Inorganic N ◽  
Dry Soil ◽  
Soil Inorganic

Azo dyes are one of the largest classes of synthetic dyes being used in textile industries. It has been reported that 15–50% of these dyes find their way into wastewater that is often used for irrigation purpose in developing countries. The effect of azo dyes contamination on soil nitrogen (N) has been studied previously. However, how does the azo dye contamination affect soil carbon (C) cycling is unknown. Therefore, we assessed the effect of azo dye contamination (Reactive Black 5, 30 mg kg−1 dry soil), bacteria that decolorize this dye and dye + bacteria in the presence or absence of maize leaf litter on soil respiration, soil inorganic N and microbial biomass. We found that dye contamination did not induce any change in soil respiration, soil microbial biomass or soil inorganic N availability (P > 0.05). Litter evidently increased soil respiration. Our study concludes that the Reactive Black 5 azo dye (applied in low amount, i.e., 30 mg kg−1 dry soil) contamination did not modify organic matter decomposition, N mineralization and microbial biomass in a silty loam soil.

Differential Protein Expression in Shewanella seohaensis Decolorizing Azo Dyes

2019 ◽  
Vol 16 (2) ◽  
pp. 156-164 ◽  
Author(s):  
Nadine Ana de Souza ◽  
Nagappa Ramaiah ◽  
Samir Damare ◽  
Bliss Furtado ◽  
Chellandi Mohandass ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Azo Dyes ◽  
Azo Dye ◽  
Dye Decolorization ◽  
Protein Quantification ◽  
Reactive Black 5 ◽  
Safe Alternative ◽  
Wide Scale ◽  
Reactive Green 19 ◽  
Azo Dye Decolorization

Background:Microbial remediation is an ecologically safe alternative to controlling environmental pollution caused by toxic aromatic compounds including azo dyes. Marine bacteria show excellent potential as agents of bioremediation. However, a lack of understanding of the entailing mechanisms of microbial degradation often restricts its wide-scale and effective application.Objective:To understand the changes in a bacterial proteome profile during azo dye decolorization.Methods:In this study, we tested a Gram-negative bacterium, Shewanella seohaensis NIODMS14 isolated from an estuarine environment and grown in three different azo dyes (Reactive Black 5 (RB5), Reactive Green 19 (RG19) and Reactive Red 120 (RR120)). The unlabeled bacterial protein samples extracted during the process of dye decolorization were subject to mass spectrometry. Relative protein quantification was determined by comparing the resultant MS/MS spectra for each protein.Results:Maximum dye decolorization of 98.31% for RB5, 91.49% for RG19 and 97.07% for RR120 at a concentration of 100 mg L-1 was observed. The liquid chromatography-mass spectrometry - Quadrupole Time of Flight (LCMS-QToF) analysis revealed that as many as 29 proteins were up-regulated by 7 hours of growth and 17 by 24 hours of growth. Notably, these were common across the decolorized solutions of all three azo dyes. In cultures challenged with the azo dyes, the major class of upregulated proteins was cellular oxidoreductases and an alkyl hydroperoxide reductase (SwissProt ID: A9KY42).Conclusion:The findings of this study on the bacterial proteome profiling during the azo dye decolorization process are used to highlight the up-regulation of important proteins that are involved in energy metabolism and oxido-reduction pathways. This has important implications in understanding the mechanism of azo dye decolorization by Shewanella seohaensis.

scholarly journals Effective Dye Degradation by Graphene Oxide Supported Manganese Oxide

Processes ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 40 ◽  
Author(s):  
Hayarpi Saroyan ◽  
George Kyzas ◽  
Eleni Deliyanni
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Surface Chemistry ◽  
Manganese Oxide ◽  
Azo Dye ◽  
Dye Degradation ◽  
High Catalytic Activity ◽  
Reactive Black 5 ◽  
Ambient Conditions ◽  
Nanocomposite Catalyst

Graphene oxide (GO) was used as a support for manganese oxide (MnO2) for the preparation of a nanocomposite catalyst for the degradation of an azo dye, Reactive Black 5 (RB5). The nanocomposite was characterized for the structure by XRD, for the morphology with SEM, and for the surface chemistry with FTIR and potentiometric titration measurements. The GO-MnO2 nanocomposite presented a high catalytic activity for the degradation/oxidation of RB5 at ambient conditions, which was higher than that of the pure MnO2 and could be attributed to the beneficial contribution of the manganese oxide and the graphene oxide.

Use of a sequencing batch biofilter for degradation of azo dyes (acids and bases)

2000 ◽  
Vol 42 (5-6) ◽  
pp. 329-336 ◽  
Author(s):  
M. Quezada ◽  
I. Linares ◽  
G. Buitrón
Keyword(s):  
Azo Dyes ◽  
Azo Dye ◽  
Degradation Rate ◽  
Removal Rate ◽  
Textile Effluent ◽  
Colour Removal ◽  
Substrate Degradation ◽  
Acids And Bases ◽  
Removal Efficiencies ◽  
Basic Red 46

The degradation of azo dyes in an aerobic biofilter operated in an SBR system was studied. The azo dyes studied were Acid Red 151 and a textile effluent containing basic dyes (Basic Blue 41, Basic Red 46 and 16 and Basic Yellow 28 and 19). In the case of Acid Red 151 a maximal substrate degradation rate of 288 mg AR 151/lliquid·d was obtained and degradation efficiencies were between 60 and 99%. Mineralization studies showed that 73% (as carbon) of the initial azo dye was transformed to CO2 by the consortia. The textile effluent was efficiently biodegraded by the reactor. A maximal removal rate of 2.3 kg COD/lliquid·d was obtained with removal efficiencies (as COD) varying from 76 to 97%. In all the cycles the system presented 80% of colour removal.

Effect of Photo-Isomerization of Azo Dyes on the Photonic Bandgap in Chiral Nematics

2011 ◽  
Vol 181-182 ◽  
pp. 257-260
Author(s):  
David Statman ◽  
Andrew Jockers ◽  
Daniel Brennan
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Azo Dyes ◽  
Azo Dye ◽  
Photonic Bandgap ◽  
Methyl Red ◽  
Central Wavelength ◽  
Chiral Nematic ◽  
Anchoring Energy ◽  
Pitch Length

Chiral nematic liquid crystals prepared with Grandjean texture demonstrate a photonic bandgap whose central wavelength is proportional to the pitch length, P, of the liquid crystal and whose width is given by (ne – no)P. We show that methyl red doped chiral nematics undergo a shift in the photonic bandgap upon photo-isomerization. This shift is a result of (1) photo-induced change in anchoring energy on the nematic surface, and (2) change in the natural pitch length from the photo-isomerization of the azo dye.

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