Study of adsorption and degradation of acid orange 7 on the surface of CeO2 under visible light irradiation

被引：356

作者：

Ji, Pengfei ^{[1
]}

Zhang, Jinlong ^{[1
]}

Chen, Feng ^{[1
]}

Anpo, Masakazu ^{[2
]}

机构：

[1] E China Univ Sci & Technol, Inst Fine Chem, Adv Mat Lab, Shanghai 200237, Peoples R China

[2] Osaka Prefecture Univ, Grad Sch Engn, Dept Appl Chem, Osaka 5998531, Japan

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2009年 / 85卷 / 3-4期

关键词：

CeO2; photocatalyst; Azo dye decomposition; Degradation pathway; 4f Electron configuration; ASSISTED PHOTOCATALYTIC DEGRADATION; AZO-DYE; CERIUM DIOXIDE; PHOTODEGRADATION; OXIDATION;

D O I：

10.1016/j.apcatb.2008.07.004

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：

Cerium dioxide was prepared by the precipitation method and found to be an efficient photocatalyst to degrade azodyes under visible light irradiation. Nonbiodegradable azodyes acid orange 7 (AO7) was selected as modal target to examine the photocatalytic activity of CeO2. AO7 could be efficiently degraded in aqueous suspension of CeO2 under visible light illumination. The catalyst was characterized by X-ray diffraction (XRD), N-2 sorption, transmission electron microscopic image (TEM) and UV/vis absorption spectrum techniques. AO7 solution was quickly decolorized and partly mineralized under visible light irradiation with existing CeO2. The photodegradation rate of this azodye catalyzed by CeO2 is much faster than those occurring on commercial titania (Degussa P25) under otherwise identical conditions of visible light irradiation. Experiments were conducted to examine the adsorption mode of acid orange 7 on CeO2 and adsorption capacity at different pH values. The possible degradation pathway has been proposed for the photocatalytic degradations by using certain radical scavengers and gas chromatography-mass spectrometry (GC-MS) to determine intermediates. The enhanced photoactivity of the lanthanide oxide CeO2 was attributed to the superior adsorption capacity and special 4f electron configuration. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：148 / 154

页数：7

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