EFFICIENT HYDROXYL RADICAL PRODUCTION AND THEIR REACTIVITY WITH ETHANOL IN THE PRESENCE OF PHOTOEXCITED SEMICONDUCTORS

被引：29

作者：

NODA, H ^{[1
]}

OIKAWA, K ^{[1
]}

OHYANISHIGUCHI, H ^{[1
]}

KAMADA, H ^{[1
]}

机构：

[1] YAMAGATA RES INST TECHNOL, YAMAGATA 990, JAPAN

来源：

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN | 1994年 / 67卷 / 08期

关键词：

D O I：

10.1246/bcsj.67.2031

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

ESR spin trapping technique has been applied to determine the quantum efficiency of the hydroxyl radical production from semiconductors such as anatase and rutile TiO2, WO3, and ZnO photoexcited with a 365 nm UV lamp in water and aqueous H2O2 solution. The quantum efficiency for anatase TiO2, rutile TiO2, and WO3 in H2O2 solution was 3-4 times larger than that in water. Its maximum values, 4.6% in water and 14.8% in 1 mmol dm-3 H2O2 solution were obtained from anatase TiO2. The reaction of the hydroxyl radical from photoexcited semiconductors with ethanol has been investigated in relation to the C-centered radical production in aqueous ethanol solution. The possible photocatalytic redox mechanisms are discussed concerning the reactions caused by photoinduced electron-hole pairs and produced radicals.

引用

页码：2031 / 2037

页数：7

共 27 条

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