Preparation of a titanium dioxide photocatalyst codoped with cerium and iodine and its performance in the degradation of oxalic acid

被引：82

作者：

Song, Shuang ^{[1
]}

Tu, Jinjun ^{[1
]}

Xu, Lejin ^{[1
]}

Xu, Xing ^{[1
]}

He, Zhiqiao ^{[1
]}

Qiu, Jianping ^{[1
]}

Ni, Jianguo ^{[2
]}

Chen, Jianmeng ^{[2
]}

机构：

[1] Zhejiang Univ Technol, Coll Biol & Environm Engn, Hangzhou 310032, Peoples R China

[2] Zhejiang Univ Technol, Inst Environm Sci & Engn, Hangzhou 310032, Peoples R China

来源：

CHEMOSPHERE | 2008年 / 73卷 / 09期

关键词：

Cerium; Iodine; Titanium dioxide; Anatase; Oxalic acid; Photocatalysis;

D O I：

10.1016/j.chemosphere.2008.08.032

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A novel class of visible light-activated photocatalysts was prepared by cocloping TiO2 with cerium and iodine (Ce-I-TiO2). The particles were characterized using the Brunauer-Emmett-Teller method, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV-Visible light absorption. Particles of Ce-I-TiO2 had greater photoabsorption in the 400-800 nm wavelength range than iodine-doped TiO2 (1-TiO2). The effects on the photocatalytic degradation of oxalic acid under visible light or UV-Visible light irradiation were investigated. The photocatalytic activity of Ce-I-TiO2 calcined at 673 K was significantly higher than that of Ce-I-TiO2 calcined at 773 K and I-TiO2 calcined at 673 K in aqueous oxalic acid solution under visible light or UV-Visible light irradiation. Under visible light irradiation, oxalic acid was first adsorbed on the surface of the catalysts rather than reacted with free radicals in the bulk solution, and then oxidized by (OHads)-O-center dot to CO2, which was verified by studying the effects of nitrogen purging and scavengers, as well as by gas chromatography/mass spectrometry. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1401 / 1406

页数：6

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