水中isoproturon的紫外降解动力学研究  

Investigation of Photodegradation Kinetics of Isoproturon in Water by UV Irradiation

作　　者：于延俊 田富箱[3] 

机构地区：[1]中国中铁二院工程集团有限责任公司,四川成都610031 [2]西南交通大学地球科学与环境工程学院,四川成都610031 [3]同济大学污染控制与资源化研究国家重点实验室,长江水环境教育部重点实验室,上海200092

出　　处：《环境保护科学》2016年第2期70-74,共5页Environmental Protection Science

摘　　要：采用atrazine法测定了紫外反应装置的光强,通过H_2O_2法测定了装置的有效光程值。进而通过这些光强和光程,建立了低压紫外条件下水中常见的苯脲类除草剂—isoproturon的拟一级降解动力学模型。基于此,文章考察了不同紫外强度和不同pH下isoproturon的紫外降解特性。Isoproturon的紫外降解反应的拟一级反应速率常数随着紫外强度的增大而逐渐增加,进而求算得isoproturon的量子产率为0.00405 mol/einstein。溶液的p H在5~9范围内变化时,isoproturon的紫外降解效率不会受到显著影响。结果表明：增大紫外光强时可实现isoproturon这种新兴污染物的有效降解,而改变溶液的p H则无明显的提高效果。In this study, according to the light intensity of UV reaction device determined by atrazine actinometer and the effective path length determined by hydrogen peroxide actinometry, a pseudo-first order photodegradation kinetic model of a common benzene urea herbicide named isoproturon by UV irradiation was investigated. Then, the effects of UV intensity and solution pH on the degradation of isoproturon during UV irradiation were addressed. The results showed that constant of the pseudo-first order reaction rate of degradation of isoproturon in solution increased gradually as the UV intensity got greater, and the quantum yield of isoproturon was calculated to be 0.00405 mol/einstein. However, solution pH varying within the range between 5 and 9 appeared to pose no remarkable influence on the photolysis rate of isoproturon. The experimental results also indicated that enhancement of UV intensity would lead to effective degradation of such emerging contaminant as isoproturon, while change of solution pH would not improve its UV degradation efficiency.

关 键 词：异丙隆 紫外辐射 降解 动力学 

分 类 号：X131.2[环境科学与工程—环境科学]