Metagenomic analysis of facilitation mechanism for azo dye reactive red 2 degradation with the dosage of ferroferric oxide

2021 ◽  
Vol 41 ◽  
pp. 102010
Author(s):  
Mengqi Gu ◽  
Qidong Yin ◽  
Guangxue Wu
Keyword(s):  
Azo Dye ◽  
Metagenomic Analysis ◽  
Ferroferric Oxide ◽  
Reactive Red 2

Biodecolorization of the Azo Dye Reactive Red 2 by a Halotolerant Enrichment Culture

2007 ◽  
Vol 79 (12) ◽  
pp. 2446-2456 ◽  
Author(s):  
M. Inan Beydilli ◽  
Spyros G. Pavlostathis
Keyword(s):  
Azo Dye ◽  
Enrichment Culture ◽  
Reactive Red 2

Effects of oxidant concentration and temperature on decolorization of azo dye: comparisons of UV/Fenton and UV/Fenton-like systems

2012 ◽  
Vol 65 (11) ◽  
pp. 1970-1974 ◽  
Author(s):  
C. Y. Kuo ◽  
C. Y. Pai ◽  
C. H. Wu ◽  
M. Y. Jian
Keyword(s):  
Rate Constant ◽  
Rate Constants ◽  
Azo Dye ◽  
Activation Energies ◽  
First Order ◽  
First Order Kinetics ◽  
Oxidant Concentration ◽  
Decolorization Efficiency ◽  
Pseudo First Order ◽  
Reactive Red 2

This study applies photo-Fenton and photo-Fenton-like systems to decolorize C.I. Reactive Red 2 (RR2). The oxidants were H2O2 and Na2S2O8; Fe2+, Fe3+, and Co2+ were used to activate these two oxidants. The effects of oxidant concentration (0.3–2 mmol/L) and temperature (25–55 °C) on decolorization efficiency of the photo-Fenton and photo-Fenton-like systems were determined. The decolorization rate constants (k) of RR2 in the tested systems are consistent with pseudo-first-order kinetics. The rate constant increased as oxidant concentration and temperature increased. Activation energies of RR2 decolorization in the UV/H2O2/Fe2+, UV/H2O2/Fe3+, UV/Na2S2O8/Fe2+ and UV/Na2S2O8/Fe3+ systems were 32.20, 39.54, 35.54, and 51.75 kJ/mol, respectively.

Biological Decolorization of the Azo Dye Reactive Red 2 Under Various Oxidation-Reduction Conditions

2000 ◽  
Vol 72 (6) ◽  
pp. 698-705 ◽  
Author(s):  
M. Inan Beydilli ◽  
Spyros G. Pavlostathis ◽  
Wayne C. Tincher
Keyword(s):  
Azo Dye ◽  
Oxidation Reduction ◽  
Reactive Red 2

scholarly journals Theoretical investigation on the mechanism of the OH-initiated degradation process of reactive red 2 azo dye

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41799-41811 ◽  
Author(s):  
Cheng Luo ◽  
Hongjie Wang ◽  
Wenyi Dong ◽  
Xianbing Zhang
Keyword(s):  
Theoretical Investigation ◽  
Azo Dye ◽  
Degradation Process ◽  
Nucleophilic Attack ◽  
Dual Descriptor ◽  
Electrophilic Attack ◽  
Bond Lengths ◽  
Reactive Red 2 ◽  
Hydrazone Form

The dual descriptor (Δf) data of azo form (a, RR2) and hydrazone form (b, HRR2) of RR2 dianion. For Δf> 0 (green), the site is favorable for nucleophilic attack, for Δf< 0 (blue), the site is favorable for electrophilic attack. Key bond lengths in Å.

Photocatalytic Degradation of C.I. Reactive Red 2 on the Mixture of TiO2 and HZSM-5 Zeolite

2011 ◽  
Vol 213 ◽  
pp. 1-4
Author(s):  
Li Li ◽  
Bo Yang ◽  
Wen Jie Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Azo Dye ◽  
Adsorption Equilibrium ◽  
Dye Adsorption ◽  
Tio2 Surface ◽  
Reactive Red 2 ◽  
Uv C ◽  
Addition Amount ◽  
Decoloration Rate

A mixture of TiO2 and HZSM-5 zeolite was used for photocatalytic degradation of an azo dye, C.I. Reactive Red 2(RR2). The adsorption of RR2 on TiO2 and the effect of TiO2 concentration were studied. HZSM-5 addition was also investigated to ascertain the function of the zeolite on RR2 decoloration. The results show that, the azo dye is quite stable under exposure of UV-C light. Less than 1.7% of the dye was adsorbed on TiO2 surface and 20 min was needed to reach dye adsorption equilibrium. The optimum TiO2 concentration was 320 mg/l. RR2 adsorption rate increased to more than 40% when HZSM-5 addition amount increased to 0.6 g in the solution. The total decoloration rate increased with the addition of HZSM-5 although zeolite addition could not enhance photocatalytic activity of TiO2.

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