Sm-N-P-TiO2纳米光催化剂在模拟太阳光下光催化降解4-氯酚的动力学

doi:10.3724/SP.J.1095.2014.30201

摘要/Abstract

摘要： 采用改进的溶胶-水热技术，制备了新型高性能Sm-N-P-TiO2纳米光催化剂。考察了条件因素对4-氯酚(4-CP)溶液在模拟太阳光下光催化降解的影响规律，并对不同催化剂的光活性进行了对比研究。结果表明，在实验条件下，4-CP光催化降解行为符合准一级动力学规律；随着4-CP溶液浓度增大，一级反应速率常数不断降低。在4-CP溶液初始浓度40 mg/L、催化剂用量1.5 g/L、溶液pH=5.2、溶液温度36 ℃、500 W氙灯照射2 h条件下，4-CP完全分解，表观速率常数Kapp为5.32×10-2 min-1，Sm-N-P-TiO2的光催化活性是混晶型纳米TiO2（P25）的3.49倍；TOC去除率达到96.8%。

关键词: TiO2, Sm-N-P共掺杂, 氯酚, 光催化, 动力学

Abstract: A novel high-performance Sm-N-P-TiO2 nano-photocatalyst was successfully prepared by a modified sol-hydrothermal technique. Influence of condition factors on the photocatalytic degradation of 4-chlorophenol(4-CP) solution under simulated sunlight irradiation was investigated. Comparative research on the photoactivities of different catalysts was also carried out. The degrading reaction fits the firstorder kinetics well under experimental conditions, and the degradation rate decreases with the increase of solution concentration. After irradiation under a 500 W Xenon lamp for 2 h, 4-CP completely decomposed with the first order reaction rate constant(Kapp) of 5.32×10-2 min-1 under the such conditions as initial concentration of 4-CP of 40 mg/L, Sm-N-P-TiO2 dosage of 1.5 g/L, pH value of 5.2, solution temperature of 36 ℃. The photoactivity of Sm-N-P-TiO2 is 3.49 times that of mixed-phase titania(P25). The TOC removal efficiency reaches 96.8%.

Key words: TiO2, Sm-N-P tridoping, chlorophenol, photocatalysis, kinetics

中图分类号:

O643.3

王庆元, 姜洪泉, 李井申, 王巧凤, 李振宇. Sm-N-P-TiO₂纳米光催化剂在模拟太阳光下光催化降解4-氯酚的动力学[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30201.

WANG Qingyuan, JIANG Hongquan*, LI Jingshen, WANG Qiaofeng, LI Zhenyu. Kinetics of Nano-Sm-N-P-TiO₂ Induced Photocatalytic Degradation of 4-Chlorophenol Under Simulated Sunlight Irradiation[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30201.

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Sm-N-P-TiO₂纳米光催化剂在模拟太阳光下光催化降解4-氯酚的动力学

Kinetics of Nano-Sm-N-P-TiO₂ Induced Photocatalytic Degradation of 4-Chlorophenol Under Simulated Sunlight Irradiation

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