在可见光照射下，NaBiO₃对五氯酚钠的快速光催化降解。
Rapid photocatalytic degradation of PCP-Na over NaBiO3 driven by visible light irradiation.
作者信息
Chang Xiaofeng, Ji Guangbin, Sui Qian, Huang Jun, Yu Gang
机构信息
Nanomaterials Research Institute, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China.
出版信息
J Hazard Mater. 2009 Jul 30;166(2-3):728-33. doi: 10.1016/j.jhazmat.2008.11.126. Epub 2008 Dec 11.
The photocatalytic performance of sodium pentachlorophenate (PCP-Na) over NaBiO(3) under visible light irradiation was first investigated systematically. After 1h of photocatalytic reaction, the degradation rate of PCP-Na could reach to 90.5% in appropriate conditions. OH 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 approximately 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. The photocatalytic reaction over NaBiO(3) 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 NaBiO(3) used have great influences on the photocatalytic performance. Three kinds of photocatalytic systems (P25, Bi(2)O(3) and P25-Bi(2)O(3) heterojunction) exhibited relative lower photocatalytic activity compared to NaBiO(3) powder.
首次系统研究了五氯酚钠（PCP-Na）在可见光照射下于NaBiO₃上的光催化性能。在光催化反应1小时后，在适当条件下PCP-Na的降解率可达90.5%。基于实验结果和态密度（DOS）分析，羟基自由基（·OH）是主要的光氧化剂而非超氧阴离子自由基（O₂⁻）。随着光催化反应的进行，PCP-Na溶液变为碱性（pH值升至约9），这可能归因于PCP⁻被·OH攻击氧化为五氯苯氧基自由基。根据朗缪尔-欣谢尔伍德模型，在NaBiO₃上的光催化反应遵循一级反应规律。PCP-Na的初始浓度、PCP-Na水溶液的初始pH值以及所用NaBiO₃的量对光催化性能有很大影响。与NaBiO₃粉末相比，三种光催化体系（P25、Bi₂O₃和P25-Bi₂O₃异质结）表现出相对较低的光催化活性。
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