Photocatalytic degradation of textile dye X3B by heteropolyoxometalate acids

被引：61

作者：

Hu, MQ ^{[1
]}

Xu, YM ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Chem, Hangzhou 31002, Zhejiang, Peoples R China

来源：

CHEMOSPHERE | 2004年 / 54卷 / 03期

基金：

中国国家自然科学基金;

关键词：

polyoxometalates; photocatalysis; textile dye; reactive brilliant red X3B; degradation;

D O I：

10.1016/S0045-6535(03)00712-4

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Reactive brilliant red X3B, one recalcitrant textile dye, was decolorized in water by (Photo)-Fenton reactions and TiO2 photocatalysis [Chemosphere 43 (2001) 1103]. Complementary to this study, the present work has shown the effectiveness of several Keggin-type heteropolyoxomatalates (POM) as a photocatalyst for X3B degradation in water at pH 1.0 under UV light (lambda greater than or equal to 320 nm) irradiation. Among four POMs, the relative activity was observed to be H3PW12O40 much greater than H4SiW12O4O > H4GeW12O40 > H3PMo12O40. The reaction was.dependent of pH, light intensity and the catalyst loading, but not obviously of the molecular oxygen dissolved in water. Compared to the photocatalyst of TiO2 (Degussa p25), H3PW12O40 was less efficient for the dye bleaching and mineralization. The mechanism study reveals that hydroxyl radicals are involved in the degradation of X3B (and Rhodamine B) by POM photocatalysis. (C) 2003 Elsevier Ltd. All fights reserved.

引用

页码：431 / 434

页数：4

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