唑啉草酯在液相中的光化学降解

doi:10.19741/j.issn.1673-4831.2022.0057

摘要/Abstract

摘要： 以氙灯为光源，研究了唑啉草酯在不同条件下的光解特性。结果表明:唑啉草酯在甲醇、乙腈、丙酮和正己烷中的光降解均符合一级反应动力学，光解速率由大到小依次为乙腈、正己烷、甲醇和丙酮，光解半衰期分别为 9.76、15.1、31.5和 138 h。NH₄⁺和NO₃^-添加浓度为1 mg·L^-1显著提高唑啉草酯在水溶液中的光解速率，光解半衰期最短为3.17 h；随着添加浓度的增加，光敏化效应呈明显减弱趋势；Fe³⁺和Cu²⁺对唑啉草酯的光解均存在光淬灭效应，淬灭率最高为16.7%。H₂O₂和TiO₂对水溶液中唑啉草酯光解速率的影响均随着其添加浓度增加而加快。以p-亚硝基-N，N-二甲基苯胺(PNDA)为·OH探针性捕获剂证实H₂O₂和TiO₂均能促进产生·OH从而加快唑啉草酯的光解速率。

关键词: 唑啉草酯, 液相, 光解, 影响因素, 半衰期

Abstract: The photolytic properties of pinoxaden under different conditions were investigated under the irradiation of a xenon lamp. The results show that the photodegradation of pinoxaden in various organic solvents conformed to the first-order kinetics. The photolysis rates descended in the order of acetonitrile, n-hexane, methanol and acetone, in which the half-lives of pinoxaden in these solvents were 9.76, 15.1, 31.5 and 138 h, respectively. The addition of NH₄⁺ and NO₃^- at 1 mg·L^-1 significantly increased the photodegradation rate of pinoxaden in aqueous solution, with the shortest half-life of pinoxaden as 3.17 h. The sensitization effect induced by these ions reduced as the concentrations further increased. Both Fe³⁺ and Cu²⁺ had a photoquenching effect on the photodegradation of pinoxaden, with a quenching rate up to 16.7%. The photolysis rates of pinoxaden in water were accelerated with increasing concentrations of H₂O₂ and TiO₂. PNDA was used as a hydroxyl radical indicator to confirm that H₂O₂ and TiO₂ both promoted the generation of hydroxyl radicals to accelerate the photodegradation of pinoxaden.

Key words: pinoxaden, liquid solution, photolysis, effect factor, half-life

中图分类号:

欧将, 欧晓明, 刘开林, 滕玉婷, 于琴琴, 梁骥, 梁贵平. 唑啉草酯在液相中的光化学降解[J]. 生态与农村环境学报, 2022, 38(9): 1188-1193.

OU Jiang, OU Xiao-ming, LIU Kai-lin, TENG Yu-ting, YU Qin-qin, LIANG Ji, LIANG Gui-ping. The Photochemical Degradation of Pinoxaden in Liquid Solution[J]. Journal of Ecology and Rural Environment, 2022, 38(9): 1188-1193.

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