Photooxidation of iodide ion on some semiconductor and non-semiconductor surfaces

被引：37

作者：

Karunakaran, C ^{[1
]}

Senthilvelan, S ^{[1
]}

Karuthapandian, S ^{[1
]}

Balaraman, K ^{[1
]}

机构：

[1] Annamalai Univ, Dept Chem, Annamalainagar 608002, Tamil Nadu, India

来源：

CATALYSIS COMMUNICATIONS | 2004年 / 5卷 / 06期

关键词：

D O I：

10.1016/j.catcom.2004.03.002

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：

In 80% aqueous ethanol, TiO2 (anatase), ZrO2, ZnO, V2O5, Fe2O3 and Al2O3 photocatalyze the oxidation of iodide ion but CdO and CdS do not; the wavelength of illumination is 365 nm. However, Fe2O3 fails to bring in a sustainable photocatalysis in 60% aqueous ethanol. The photooxidation of iodide ion on TiO2, ZrO2, ZnO, V2O5 and Al2O3 in 60% aqueous ethanol was studied as a function of [I-], amount of catalyst suspended, airflow rate, light intensity and solvent composition. The metal oxides examined show sustainable photocatalytic activity. Iodine formation is larger with illumination at 254 run than at 365 nm. The mechanisms of photocatalysis on semiconductor and non-semiconductor surfaces have been discussed. Photocatalytic generation of iodine has been analyzed using a kinetic model. The photocatalytic efficiencies are of the order V2O5 > TiO2 > ZrO2 > ZnO > Al2O3 and V2O5 > TiO2 > ZrO2 > ZnO = FeO3 > Al2O3 in 60% and 80% aqueous ethanol. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：283 / 290

页数：8

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