Photocatalytic degradation of Azure and Sudan dyes using nano TiO2

被引：138

作者：

Aarthi, T. ^{[1
]}

Narahari, Prashanthi ^{[1
]}

Madras, Giridhar ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Chem Engn, Bangalore 560012, Karnataka, India

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2007年 / 149卷 / 03期

关键词：

photocatalysis; Azure; Sudan; TiO2; dye degradation; combustion synthesis;

D O I：

10.1016/j.jhazmat.2007.04.038

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The present study investigates the dependence of photocatalytic rate on molecular structure of the substrate that is degraded. The photocatalytic degradation of Azure (A and B) and Sudan (III and IV) dyes, having similar structure, but different functional groups, were investigated with two catalysts. The photocatalytic activity of solution combustion synthesized TiO2 (CS TiO2) was compared with that of Degussa P-25 for degrading these dyes. The effect of solvents and mixed-solvent system on photodegradation of Sudan III was investigated. The photodcgradation rate was found to be higher in solvents with higher polarity. The effect of pH and the presence of metal ions in the form of chloride and nitrate salt, on degradation rate of Azure A was also investigated. The metal ions significantly reduced the photocatalysis rates. A detailed Langmuir-Hinshelwood kinetic model has been developed to explain the effect of metal ions on degradation rate of the substrate. This model elucidates the contribution of holes and electrons towards degradation of the dye. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：725 / 734

页数：10

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