Sm-N-P-TiO_2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-TiO_2 Induced Photocatalytic Degradation of 4-Chlorophenol Under Simulated Sunlight Irradiation

作　　者：王庆元[1] 姜洪泉[1] 李井申[1] 王巧凤[1] 李振宇[1] 

机构地区：[1]哈尔滨师范大学功能材料设计合成与绿色催化黑龙江省高校重点实验室,哈尔滨150025

出　　处：《应用化学》2014年第3期310-315,共6页Chinese Journal of Applied Chemistry

基　　金：黑龙江省高校科技创新团队建设计划(2011TD010);黑龙江省教育厅科学技术研究资助项目(12531213)~~

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5.32×10-2min-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%。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 d （4-CP） solution under simulated sunlight irradiation was investigated. Comparative of 4-chlorophenol research on the photoaetivities 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%.

关 键 词：TiO2 Sm-N-P共掺杂 氯酚 光催化 动力学 

分 类 号：O643.3[理学—物理化学]