文献类型：期刊文献

英文题名：Photocatalytic degradation of acid azo dyes in aqueous TiO₂ suspension II.: The effect of pH values

作者：Zhan, HQ; Chen, KC; Tian, H

机构：[1]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：1998

卷号：37

期号：3

起止页码：241

外文期刊名：DYES AND PIGMENTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000073244100006)】；

语种：英文

外文关键词：photocatalytic degradation; acid azo dyes; pH; TiO2

摘要：The photocatalytic degradation of H/K acid derived 30 dyes in aqueous TiO2 suspension follows apparent first-order kinetics. The site near the azo bond (C-N=N- bond) is the attacked area in the photocatalytic degradation process, whilst the TiO2 photocatalytic destruction of the C-N(=) bond and -N=N- bonds leads to fading of the dyes. The pH effect on the TiO2 photocatalytic degradation of the H/K acid derived azo dyes varies with the different structure of the dyes. Hydroxyl radicals play an essential role in the fission of the C-N=N- conjugated system in azo dyes in TiO2 photocatalytic degradation. (C) 1998 Elsevier Science Ltd.