Aqueous Cr(VI) photo-reduction catalyzed by TiO2 and sulfated TiO2

被引：105

作者：

Jiang, F ^{[1
]}

Zheng, Z ^{[1
]}

Xu, ZY ^{[1
]}

Zheng, SR ^{[1
]}

Guo, ZB ^{[1
]}

Chen, LQ ^{[1
]}

机构：

[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2006年 / 134卷 / 1-3期

关键词：

TiO2; sulfated TiO2; surface acidity; Cr(VI) photo-reduction; photocatalysis;

D O I：

10.1016/j.jhazmat.2005.10.041

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

TiO2 and sulfated TiO2 (SO42-/TiO2) catalysts with different textural properties were prepared under different calcination temperatures and the photo-reduction of Cr(VI) to Cr(III) catalyzed by these catalysts was investigated. For the photocatalytic reduction of Cr(VI), the photocatalytic activities of the TiO2 samples were found to be strongly dependent of the calcination temperature and TiO2 calcined at 400 degrees C showed a higher catalytic activity compared to other TiO2 catalysts. In contrast, sulfation of TiO2 stabilized the catalytic activities Of SO42-/TiO2 catalysts. At low calcination temperature, SO42-TiO2 catalysts exhibited catalytic activities almost comparable with that of TiO2 and the catalytic activities of SO42-/TiO2 catalysts were markedly higher than TiO2 under high calcination temperature. In addition, the removal of surface SO42- of SO42-/TiO2 catalyst led to a marked decrease of the catalytic activity for Cr(VI) photo-reduction, suggesting that the presence of surface SO42- provided an acid environment over the catalyst surface and favored the photo-reduction of Cr(VI). (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：94 / 103

页数：10

共 49 条

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