Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582003 | Journal of Hazardous Materials | 2009 | 6 Pages |
Abstract
The photocatalytic performance of sodium pentachlorophenate (PCP-Na) over NaBiO3 under visible light irradiation was first investigated systematically. After 1Â h of photocatalytic reaction, the degradation rate of PCP-Na could reach to 90.5% in appropriate conditions. OH is the dominant photooxidant rather than O2â based on the experiment results and density of states (DOS) analysis. The PCP-Na solution became basic (pH value increased to â¼9) with the progress of photocatalytic reaction which may be attributed to the PCPâ oxidized to the pentachlorophenoxy radical by an attack on PCPâ by OH. 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.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Xiaofeng Chang, Guangbin Ji, Qian Sui, Jun Huang, Gang Yu,