功率超声场作用下水溶液中甲苯的降解机理  

The Sonochemical-degradation Mechanism of Toluene in Aqueous Solution

作　　者：卞华松[1] 张大年[1] 赵一先[1] 金至清[2] 华彬[2] 

机构地区：[1]华东理工大学环境工程研究所,上海200237 [2]上海大学环境科学与工程系,上海200072

出　　处：《环境科学》2001年第3期84-87,共4页Environmental Science

基　　金：上海市高等教育发展基金!资助项目 (编号 98AJ0 3)

摘　　要：研究密闭体系功率超声场中甲苯的超声降解过程 ,并探讨降解机理及反应历程 .甲苯的降解效率受辐射时间影响较大 ,降解过程符合拟一级反应 ,通常处理 4 0min后可以获得 90 %～ 95%的去除率 ,而溶液中饱和气体种类等也产生一定的影响 .经pH、紫外和SMPE GC MS等分析 ,以及发光氨与自由基反应现象 ,证实甲苯的超声降解以自由基降解为主 ,主要中间降解产物为苯甲醛、联甲苯、邻苯二甲酸二丁脂等 ,最终产物为二氧化碳和水 .The sonochemical degradation of toluene in the airproof aqueous solution was studied, and the mechanism and course of degradation was explored. It was found that the sonication time had great effect on the removal rate of toluene, and the degradation followed a pseudo-first-order kinetic law, and 90%～95% of toluene was removed only after being irradiated for 40min, types of dissolved gas and pH also had some effects. After aqueous solution was analyzed pH and scanned UV-wave-length and identified components with SMPE-GC-MS, results confirmed that radical-oxidation controlled the sonochemical-oxidation of toluene, and main middle-products included benzaldehyde, bibenzyl, dibutyl phthalate, et al., final products were carbon dioxide and water.

关 键 词：超声波空化 甲苯 降解机理 功率超声场 水溶液 

分 类 号：X783[环境科学与工程—环境工程]