Surface modification of TiO2 by a ruthenium(II) polypyridyl complex via silyl-linkage for the sensitized photocatalytic degradation of carbon tetrachloride by visible irradiation

被引：46

作者：

Fung, AKM ^{[1
]}

Chiu, BKW ^{[1
]}

Lam, MHW ^{[1
]}

机构：

[1] City Univ Hong Kong, Ctr Coastal Pollut & Conservat, Dept Biol & Chem, Kowloon, Hong Kong, Peoples R China

来源：

WATER RESEARCH | 2003年 / 37卷 / 08期

关键词：

photocatalytic degradation; TiO2; photosensitization; regenerative sensitization;

D O I：

10.1016/S0043-1354(02)00567-5

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A new ruthenium(II) photosensitizer, [Ru-II(py-pzH)(3)](2+) (where py-pzH = 3-(2'-pyridyl)pyrazole), has been synthesized. The complex displayed outstanding excited state redox properties (estimated Ru-III/Ru-II* approximate to -1.24V vs. NHE) and was expected to sensitize the injection of electrons into the conduction band of anatase TiO2 upon visible irradiation. The photosensitizer was anchored onto the surface of anatase TiO2 particles via in situ silylation. The silyl-linkage displayed excellent stability in both aqueous media, over a wide pH range, and in common organic solvents. The resultant material, TiO2-[Ru-II(PY-PZ-Sidrop)(3)], was found to be able to mediate degradation Of CCl4 in neutral aqueous medium under broad band visible irradiation (lambda > 450 nm). The relation between the rate of degradation and concentration of substrate was explored and the mechanism of the photodegradation of the perhalogenated organic was discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1939 / 1947

页数：9

共 34 条

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