Quantum yields of active oxidative species formed on TiO2 photocatalyst

被引：719

作者：

Ishibashi, K

Fujishima, A

Watanabe, T

Hashimoto, K

机构：

[1] Kanagawa Acad Sci & Technol, Takatsu Ku, Kanagawa 2130012, Japan

[2] Univ Tokyo, Dept Appl Chem, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

[3] Univ Tokyo, Adv Sci & Technol Res Ctr, Meguro Ku, Tokyo 1538904, Japan

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2000年 / 134卷 / 1-2期

关键词：

TiO2; photocatalysis; OH radical; photogenerated hole; fluorescence probe; quantum yield;

D O I：

10.1016/S1010-6030(00)00264-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The quantum yield of hydroxyl radical (. OH) production during TiO2 photocatalysis was estimated to be 7 x 10(-5) in aqueous solution by means of a method using terephthalic acid as a fluorescence probe. This value is much lower than the quantum yield of ordinary photocatalytic reactions (similar to 10(-2)). Conversely the quantum yield of hole generation estimated by iodide ion oxidation was equivalent (5.7 x 10(-2)) to that of ordinary photocatalytic reactions. This implies that oxidative reactions on TiO2 photocatalyst occur mainly via photogenerated holes, not via . OH. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：139 / 142

页数：4

共 52 条

[1] KINETIC-STUDIES IN HETEROGENEOUS PHOTOCATALYSIS .2. TIO2-MEDIATED DEGRADATION OF 4-CHLOROPHENOL ALONE AND IN A 3-COMPONENT MIXTURE OF 4-CHLOROPHENOL, 2,4-DICHLOROPHENOL, AND 2,4,5-TRICHLOROPHENOL IN AIR-EQUILIBRATED AQUEOUS-MEDIA [J].