紫外光光催化降解杀虫剂哒螨酮降解产物的分布及应用研究  

STUDY ON PHOTOCATALYTIC DEGRADATION OF PESTICIDE PYRIDABEN BY UV LIGHT-PRODUCT DISTRIBUTION AND APPLICATION

作　　者：朱馨乐[1] 沈迅伟[1] 袁春伟[1] 

机构地区：[1]东南大学分子与生物分子电子学教育部重点实验室

出　　处：《环境化学》2005年第4期426-429,共4页Environmental Chemistry

基　　金：国家"863计划"重大项目(2002AA302304)资助.

摘　　要：藉助GC-MS对乙腈/水体系中,360nm以上紫外光光催化杀虫剂哒螨酮产生的降解产物进行定性分析,共检测出15种中间产物.通过降解产物GC峰面积与时间的关系,半定量分析了其生成变化,得到典型的钟型曲线.基于以上分析提出了光催化降解哒螨酮的机理.另外,研究了不同pH值下,十六烷基三甲基溴化铵(CTAB)水溶液中哒螨酮的降解,结果表明,碱性条件下有利于光催化降解反应的进行.A qualitative study of the degradation products of the photodegradation of pesticide pyridaben in acetonitrile/ water systems under ≥ 360nm UV light irradiation was performed by GC-MS. Up to fifteen compounds were detected as degradation intermediates. We also analyzed the evolution of the degradation products semiquantitatively by plotting areas of the corresponding GC peaks as functions of irradiation time, and the characteristic bell-shaped behavior of intermediates was derived. On the basis of which the photocatalytic degradation mechanism of pyridaben has been proposed. For application, TiO2 photoassisted degradation of pyridaben has been studied in aqueous dispersions in the presence of the cationic surfactant cetyltrimethyl ammonium bromide (CTAB) at different pH values. The results indicated that the degradation favors alkaline condition. The investigation of its degradability processes in water will permit us to bring solutions to remediate water pollution of pesticide insoluble efficiently.

关 键 词：光催化降解 降解产物 哒螨酮 杀虫剂 紫外光 十六烷基三甲基溴化铵 应用 分布 GC-MS 半定量分析 定性分析 中间产物 降解反应 碱性条件 水体系 峰面积 pH值 水溶液 

分 类 号：X592[环境科学与工程—环境工程]