Synergistic effect in treatment of C.I. Acid Red 2 by electrocoagulation and electrooxidation

An aqueous C.I. Acid Red 2 solution was decolorized by electrolysis using iron as anode. The decolorization mechanism was investigated through experimental observations on the electrochemical behavior of C.I. Acid Red 2 on Pt rotating disk electrode, UV–visible spectra of the solution and IR spectra...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-10, Vol.170 (2), p.883-887
Main Authors: Zhang, X.D., Hao, J.D., Li, W.S., Jin, H.J., Yang, J., Huang, Q.M., Lu, D.S., Xu, H.K.
Format: Article
Language:English
Subjects:
Algorithms
Anodizing
Applied sciences
Azo Compounds - chemistry
C.I. Acid Red 2
Chemical engineering
Color
Coloring Agents - chemistry
Decoloring
Decolorization
Electrochemistry
Electrocoagulation
Electrodes
Electrolysis
Electrooxidation
Exact sciences and technology
Ferric ions
Infrared radiation
Iron
Oxidation-Reduction
Oxygen - analysis
Pollution
Reactors
Spectra
Spectrophotometry, Infrared
Spectrophotometry, Ultraviolet
Synergistic effect
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Summary:An aqueous C.I. Acid Red 2 solution was decolorized by electrolysis using iron as anode. The decolorization mechanism was investigated through experimental observations on the electrochemical behavior of C.I. Acid Red 2 on Pt rotating disk electrode, UV–visible spectra of the solution and IR spectra of the coagulated mixtures. It is found that the decolorization efficiency is high, over 98.0% after 40 min, and this high decolorization efficiency can be ascribed to the synergistic effect of electrocoagulation and electrooxidation. The electrocoagulation results from the electrogenerated iron hydroxide and the electrooxidation results from electrogenerated ferric ions. The results obtained from IR spectra shows that the decolorization of C.I. Acid Red 2 by electrooxidation is due to the partial or complete cleavage of C–N bonds in C.I. Acid Red 2.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2009.05.050