【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.更多还原

【Abstract】 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.更多还原