几种氯代烃的光催化降解试验研究  

EXPERIMENTAL RESEARCH ON PHOTOCATALYTIC DEGRADATION OF SEVERAL TYPES OF CHLOROHYDROCARBON

作　　者：陈翔[1] 许嘉琳[1] 张铁垣[2] 

机构地区：[1]北京师范大学环境科学研究所环境模拟与污染控制国家重点联合实验室,北京100875 [2]北京师范大学分析测试中心,北京100875

出　　处：《北京师范大学学报（自然科学版）》1997年第2期270-274,共5页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金!49571062

摘　　要：在紫外光源-TiO2半导体催化剂体系中，对环境中需优先控制的污染物三氯甲烷、二氯甲烷、三氯乙烯进行了光催化降解试验．结果表明：降解过程属于一级动力学反应．依据反应动力学方程，得出了催化剂投加量、氯代烃种类对降解速率的影响．添加金属离子能提高反应效率．在试验条件下，银对光催化降解的促进作用高于锌、铁．Photocatalytic degradation experiments were conducted in ultraviolet light source-titanium dioxide semiconductor system using priority pollutants, i. e., chloroform,dichloromethane, and trichloroethylene in water solution as targets. The results revealed that the degradation process belongs to first-order kinetic reaction. According to the kinetic equations,the effacts of catalyst dose and cholorohydrocarbon types on the degradation rate were determined and the improvement of the rate by addition of metals was proved. Under the experimental conditions of this study, the promoting degree of Ag-loaded TiO2, was higher than that of Zn - loaded and Fe - loaded TiO2.

关 键 词：有机污染物 光催化 氯代烃 降解 半导体催化剂 

分 类 号：X131[环境科学与工程—环境科学]