水体中微污染磺胺嘧啶光催化降解行为  

Photocatalytic degradation of trace sulfadiazine in water

作　　者：梁凤颜[1] 尹平河[1] 赵玲[1] 吴楚萍[1] 

机构地区：[1]暨南大学生命科学与技术学院,广东广州510632

出　　处：《生态环境学报》2009年第4期1227-1230,共4页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(40673062);国家973项目(2001CB409710)

摘　　要：抗生素在人体健康和畜牧业生产中起到了积极的作用,但是未被完全吸收和利用的抗生素或其代谢物将通过尿液、粪便排泄等途径进入水体,对水环境的生态安全性及人体健康构成威胁,因而,痕量抗生素在环境中的出现及其潜在危害引起了越来越多的关注。对使用较为广泛的广谱抗菌剂磺胺嘧啶(SDZ)在水中的光催化氧化降解行为进行研究,探讨了反应过程中光照、TiO2的用量、反应起始pH、SDZ的初始质量浓度、反应时间等因素对SDZ降解效率的影响。研究结果表明,SDZ降解符合一级动力学规律,当pH=6.7、SDZ初始质量浓度为2.0mg·L-1、TiO2用量为80mg·L-1、反应时间为60min时,SDZ的降解率达到99.9%。结果表明,UV-TiO2光催化氧化能够有效降解水中的磺胺类微污染物。In recent years, antibiotics play an important role in human health and stockbreeding. However, incompletely absorbed antibiotics will eventually find their way into the waterways through wastewater effluents. The occurrences of trace antibiotics in aquatic environments, in the form of their original structures and/or metabolites, will threaten the safety of ecological and human health, and have attracted much concern from the public. In this paper, the photocatalytic degradation of trace sulfadiazine in water by UV-TiO2 was investigated. The effects of the TiO2 dosage, initial concentration of SDZ, irradiation time, and solution pH on the rates of degradation were investigated. The results showed that SDZ can be efficiently degraded by the use of TiO2. The degradation reaction followed the characteristics of the first order reaction kinetics. The degradation efficiency of SDZ reached 99.9% under the conditions of initial concentration of SDZ of 2.0 mg.L^-1, TiO2 dose of 80 mg.L^-1, solution pH of 6.7, and reaction time of 60 min. This indicated that UV-TiO2/EP was an effective method in removing trace sulfadiazine in water.

关 键 词：磺胺嘧啶 光催化剂 UV 降解率 

分 类 号：X131.2[环境科学与工程—环境科学]