紫外光照射下纳米TiO_2降解水中有机氯酚类化合物  

UV Induced Degradation of Chlorophenols in TiO_2 Aqueous Suspensions

作　　者：刘香玲[1] 潘家荣[1] 李瑞萍[1] 方艳芬[1] 黄应平[1] 

机构地区：[1]三峡大学生态环境科学研究中心,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2006年第2期177-180,共4页Journal of China Three Gorges University：Natural Sciences

基　　金：国家重点基础研究发展计划(973计划)项目(2033CB415006);湖北省青年杰出人才基金项目(2005ABB030);宜昌市科技发展计划项目(A04401-6)

摘　　要：选取有机氯酚类化合物邻氯苯酚(OCP)、对氯苯酚(PCP)及2,4-二氯苯酚(DCP)为目标化合物,在紫外光照射下(330 nm<λ<380 nm),以P25纳米TiO2作为光催化剂,研究其对目标化合物的降解特性.考察了酸度及紫外光光解对其降解行为的影响,结果表明OCP、PCP及DCP分别在pH 6.0、4.2、5.0酸度条件下降解效果最好.在实验条件下OCP、PCP及DCP分别降解240 min、270 min1、60 min后矿化率达到100%.OCP、PCP及DCP降解速率常数分别为0.004 54、0.003 64及0.005 03.根据实验结果及文献初步探讨了其光催化氧化降解机理.The photo-catalytic degradation of o-chlorophenol, p-chlorophenol and 2,4- dichlorophenol in TiO2 （P25） aqueous suspensions with UV irradiation（330 nm〈λ〈380 nm） was studied. Moreover, the effect of pH and UV illumination on degradation efficiency was also observed. The best condition for photo-catalytic degradation of o-chlorophenol, p-chlorophenol and dichlorophenol was at pH 6.0, 4.2 and 5.0, respectively. TOC removal yield for o-chlorophenol, p-chlorophenol and dichlorophenol was 100% after 240min, 270min and 160min of UV irradiation. Experimental data demonstrate that the reaction rate constant of degradation of o-chlorophenol, p-chlorophenol and dichlorophenol in the presence of TiO2 is 0.004 54, 0. 003 64 and 0. 005 03 respectively. Meanwhile, possible mechanisms for photo-degradation of chlorophenols were discussed according to experimental data and relevant references.

关 键 词：氯酚 光催化降解 TIO2 

分 类 号：O657.32[理学—分析化学] X592[理学—化学]