敌草快在水溶液中的光解动力学研究

摘要

常温常压条件下,用500 w高压汞灯和太阳光分别照射处理敌草快水溶液,考察光照和初始浓度对敌草快在水溶液中光降解的影响。研究表明,分别用500 w高压汞灯和太阳光照射下,敌草快的光解反应均符合一级动力学规律,降解半衰期分别为0.11 d和240.63 d;敌草快的初始浓度越大,其光解率越小,光解率与其初始浓度呈负相关。%Diquat in water was irradiated at room temperature by a 500 w high pressure mercury lamps and sunlight,respectively.Influence of light and initial concentration of diquat on the photolysis was studied.The results showed that under the irradiation of 500 w high pressure mercury lamps and sunlight,the photolysis complied with first-order kinetics.The photolysis half-lives are 0.11 and 240.63d,respectively.The higher the initial diquat concentration was,the slower the photolysis rate became.The photolysis rate and the initial concentration are correlated negatively.