Photocatalytic reduction of Cr(VI) in aqueous solutions by UV irradiation with the presence of titanium dioxide

被引：518

作者：

Ku, Y ^{[1
]}

Jung, IL ^{[1
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Dept Chem Engn, Taipei, Taiwan

来源：

WATER RESEARCH | 2001年 / 35卷 / 01期

关键词：

UV/TiO2; process; Cr(VI); photocatalyic reduction;

D O I：

10.1016/S0043-1354(00)00098-1

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The reduction of Cr(VI) in aqueous solution by UV/TiO2 reduction process was studied under various solution pH values, TiO2 dosages, light intensities, dissolved oxygen levels and other operating conditions. The reduction rates of Cr(VI) by photocatalytic-induced elections were significantly higher for acidic solutions than those for alkaline solutions. Increasing the light intensity would drastically increase the reduction rate of Cr(VI), but was ultimately influenced by the amount of TiO2 present in solutions. The presence of dissolved oxygen had minimum effect on the reduction of Cr(VI) by UV/TiO2 process in acidic solutions. The presence of ethanol might act as scavenger for holes and promoted the photocatalytic reduction of Cr(VI) by electrons. The Cr(VI) adsorbed on the surface of TiO2 particles was observed to be photoreduced to Cr(III) almost completely. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：135 / 142

页数：8

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