Optimization of photocatalytic degradation conditions of Direct Red 23 using nano-Ag doped TiO2

被引：125

作者：

Sobana, N. ^{[1
]}

Selvam, K. ^{[1
]}

Swaminathan, M. ^{[1
]}

机构：

[1] Annamalai Univ, Dept Chem, Annamalainagar 608002, Tamil Nadu, India

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2008年 / 62卷 / 03期

关键词：

nano-silver doped titanium dioxide; Direct Red 23; degradation; electron traps. UV-A light; inorganic oxidants;

D O I：

10.1016/j.seppur.2008.03.002

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Photocatalytic degradation of Direct Red 23 (DR23) by nano-Ag doped TiO2 has been investigated under different conditions. Photodeposition of 1.5% Ag on the surface of TiO2 enhanced its photoactivity in DR23 degradation. Optimal experimental conditions on catalyst amount, pH and dye concentration have been determined. Addition of some inorganic oxidizing species such as H2O2, (NH4)S2O8 and KBrO3 up to a certain concentration increased the rate of degradation. The higher photoactivity of Ag-TiO2 than TiO2 under UV irradiation can be ascribed to the effect of silver deposits acting as electron traps on the Ag-TiO2 surface. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：648 / 653

页数：6

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