水中萘普生的紫外光降解机制及其产物毒性研究  

Photodegradation of Naproxen in Aqueous Systems by UV Irradiation: Mechanism and Toxicity of Photolysis Products

作　　者：马杜娟[1] 刘国光[1] 吕文英[1] 姚锟[1] 周丽华[2] 谢成屏[3] 

机构地区：[1]广东工业大学环境科学与工程学院,广州510006 [2]广东工业大学轻工化工学院,广州510006 [3]信息产业部电子第五研究所,广州510610

出　　处：《环境科学》2013年第5期1782-1789,共8页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07211-005-03);广东高校优秀青年创新人才培养计划项目(LYM09070);广东高校优秀青年创新人才培养计划项目(LYM10086)

摘　　要：以120 W汞灯为紫外光光源,通过活性氧物种(ROS)的淬灭实验和溶解氧(DO)浓度实验和发光菌毒性实验,对水中萘普生(NPX)的降解机制、反应动力学及其产物毒性进行了研究.结果表明,NPX的紫外光降解过程包括了直接光解和ROS参与的自敏化光解两个过程,同时.OH、1O2、O.2-的自敏化光解贡献率分别为0.1%、80.2%、35.7%;溶解氧浓度实验表明,溶解氧对萘普生的降解具有抑制作用,而且浓度越大,抑制效果越明显;发光菌毒性实验表明,萘普生光降解生成了具有较萘普生更高风险的中间产物.本研究中萘普生的所有光解实验过程均符合准一级动力学方程.This paper studies the degradation mechanism,the reaction kinetics and the toxicity of photolysis products of naproxen in waters under UV irradiation（120 W mercury lamp） by quenching experiments of reactive oxygen species（ROS）,oxygen concentration experiment and toxicity evaluation using Vibrio fischeri bacteria.The results demonstrated that NPX could be degraded effectively by UV irradiation and the photolysis pathways was the sum of the degradation by direct photolysis and self-sensitization via ROS,and the contribution rates of self-sensitized photodegradation were 0.1%,80.2%,35.7% via ·OH,1 O2,O·-2,respectively.The effect of oxygen concentration illustrated that dissolved oxygen had an inhibitory effect on the direct photodegradation of NPX,and the higher the oxygen content,the more obvious the inhibitory effect.The toxicity evaluation illustrated the formation of some intermediate products that were more toxic than NPX during the photodegradation of NPX.The process of NPX degradation in all cases could be fitted by the pseudo first-order kinetics model.

关 键 词：萘普生 光降解 机制 发光菌 毒性 

分 类 号：X171.5[环境科学与工程—环境科学] X703.1