水溶液中α-萘乙酸的光降解研究  

Photolysis of α Naphthaleneacetic Acid in Aqueous Solution.

作　　者：周祖飞[1] 蒋伟川[1] 刘维屏[1] 

机构地区：[1]浙江大学化学系

出　　处：《环境科学》1997年第1期35-37,41,共4页Environmental Science

基　　金：国家自然科学基金

摘　　要：为了解α－萘乙酸（ＮＡＡ）在环境中滞留、迁移和转化等行为，以低功率紫外灯和荧光灯为光源，对水溶液中的ＮＡＡ进行光降解．研究结果表明，主波长为２５４ｎｍ的紫外光能有效降解ＮＡＡ，降解呈一级动力学反应；而主波长为３６５ｎｍ的长波光对ＮＡＡ几乎不降解；添加ＴｉＯ２能有效催化ＮＡＡ的降解．采用ＧＣ－ＭＳ技术鉴定了几种光解主要产物，ＮＡＡ的光降解包括氧化脱羧和芳环的氧化断裂过程．Photolysis of α naphthaleneacetic acid(NAA)has been investigated at 25℃ in aqueous solutions by irradiation at different wavelengths. The shorter wavelength of 254nm is considerably more effective in promoting degradation than wavelength of 365nm. The primary degradation of NAA follows a pseudo first order kinetics. The photolysis half life and rate constant were determined to be 60min and 1.15×10 -2 min -1 respectively. The optimum photolysis rate has been observed using TiO 2 powder as photocatalyst. Several reaction intermediates were identified using GC/MS technique. The photolysis of NAA involves decarboxylation and oxidation on aromatic ring.On the basis of the analytical data, a mechanism of the process has been proposed.

关 键 词：光降解 萘乙酸 紫外光 植物生长调节剂 

分 类 号：TQ452.202[化学工程—农药化工]