Rapid photocatalytic degradation of PCP-Na over NaBiO3 driven by visible light irradiation

被引:47
作者
Chang, Xiaofeng [1 ,2 ]
Ji, Guangbin [1 ]
Sui, Qian [2 ]
Huang, Jun [2 ]
Yu, Gang [2 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanomat Res Inst, Nanjing 210016, Peoples R China
[2] Tsinghua Univ, Dept Environm Sci & Engn, POPs Res Ctr, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
NaBiO3; Photocatalysis; Sodium pentachlorophenate (PCP-Na); AQUEOUS-SOLUTION; PENTACHLOROPHENOL; BI2WO6; DECOMPOSITION; OZONATION; MANGANESE;
D O I
10.1016/j.jhazmat.2008.11.126
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The photocatalytic performance of sodium pentachlorophenate (PCP-Na) over NaBiO3 under visible light irradiation was first investigated systematically. After I h of photocatalytic reaction, the degradation rate of PCP-Na could reach to 90.5% in appropriate conditions. (OH)-O-center dot is the dominant photooxidant rather than O-2(-) based on the experiment results and density of states (DOS) analysis. The PCP-Na solution became basic (pH value increased to similar to 9) with the progress of photocatalytic reaction which may be attributed to the PCP- oxidized to the pentachlorophenoxy radical by an attack on PCP- by (OH)-O-center dot. The photocatalyic reaction over NaBiO3 follows the rule of first-order reaction according to the Langmuir-Hinshelwood model. The initial concentration of the PCP-Na, the initial pH value of PCP-Na aqueous solution and the amount of NaBiO3 used have great influences on the photocatalytic performance. Three kinds of photocatalytic systems (P25, Bi2O3 and P25-Bi2O3 heterojunction) exhibited relative lower photocatalytic activity compared to NaBiO3 powder. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:728 / 733
页数:6
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