Degradation mechanism of azo dye C. I. reactive red 2 by iron powder reduction and photooxidation in aqueous solutions.
We have made a comparison of the UV-VIS spectra of three azo dyes, C. I. reactive red 2, orange II and C. I. reactive black 8, in aqueous solutions during treatment with iron powder reduction and photooxidation. From this, we propose their mechanisms for reduction photooxidation. GC/MS analyses of the degradation products of the dye C. I. reactive red 2 demonstrated some important steps producing hydrogenated azo structure, substituted benzene and substituted naphthalene.
Feng
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W
Department of Environmental Science and Engineering, Wuhan University, Hubei, People's Republic of China. fwu@yeah.net
Nansheng
D
D
Helin
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H
D001391:Azo Compounds / Q000737:chemistry / Q000378:metabolism*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D010777:Photochemistry; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D001391:Azo Compounds; D014874:Water Pollutants, Chemical; D007501:Iron