Quantum yields of active oxidative species formed on TiO2 photocatalyst

被引：715
|
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
收藏
页码：139 / 142
页数：4
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