Photocatalytic reduction of heavy metal ions on derivatized titanium dioxide nano-particle surface studied by XAFS

被引：16

作者：

Chen, LX ^{[1
]}

Rajh, T ^{[1
]}

Micic, O ^{[1
]}

Wang, ZY ^{[1
]}

Tiede, DM ^{[1
]}

Thurnauer, M ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1997年 / 133卷 / 1-4期

关键词：

D O I：

10.1016/S0168-583X(97)00546-6

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Photoreduction of heavy metal ions, Cu2+ and Hg2+, on TiO2 nano-particle surfaces, has been investigated by XAFS measurements. The effects of TiO2 surface modification reagents on the reaction efficiency have been studied. We observed a significant reaction efficiency enhancement when amino acid alanine was added to a mixture of 0.01M Cu2+ and TiO2 nano-particles. Fifty percent of the adsorbed Cu2+ has been reduced to Cu-0 after 1-h illumination with a UV-enhanced xenon lamp. Photoreduction of Hg2+ on TiO2 colloid surfaces was also investigated without and with thiolactic acid (TLA). In this case, the photoreduction efficiency for Hg2+ was lowered. Structures of metal ion surroundings in various complexes as well as their role in photoreduction of metal ions are discussed. (C) 1997 Published by Elsevier Science B.V.

引用

页码：8 / 14

页数：7

共 12 条

[1] A REFINEMENT OF CRYSTAL STRUCTURE OF COPPER(2) OXIDE WITH A DISCUSSION OF SOME EXCEPTIONAL ESDS [J].