模拟日光照射下三种抗生素的光降解行为  

Photodegradation behavior of three antibiotics with solar simulator

作　　者：李圆杏[1] 黄宏[1] 刘臻[1] 

机构地区：[1]上海海洋大学海洋科学学院,上海201306

出　　处：《环境化学》2013年第8期1513-1517,共5页Environmental Chemistry

基　　金：上海市教委创新项目(12YZ128);上海市教委高校第五期海洋环境工程重点学科(J50702);上海市科委项目(10230502900)资助

摘　　要：选取四环素、土霉素、红霉素等3种国内普遍使用的抗生素,研究其在模拟日光(1.7 kW氙灯,300 nm≤λ≤400 nm)下的降解动力学行为.结果表明,3种抗生素在模拟日光下均能发生光降解,3 h的降解率分别达到66.87%、90.55%和92.80%.降解过程均符合准一级反应动力学方程,速率常数(k)分别为:0.0064、0.0138 min-1和0.0155 min-1;半衰期(t1/2)分别为:108.30、50.23、44.72 min.采用LC-MS分析推断3种抗生素主要降解产物,探讨了它们可能的光解途径.Antibiotics are frequently detected as emerging pollutants in aqueous environment.Three antibiotics widely used in China（tetracycline,oxytetracycline,erythromycin） were selected to investigate the degradation kinetics by identifying and determining the concentrations of antibiotics in water with solar simulator（1.7 kW xenon lamp,300 nm≤λ≤400 nm）.The results indicate that photodegradation occurd for the three antibiotics under simulated sunlight irradiation.The degradation rates obtained after 3 h were 66.07%,90.55%,and 92.8%,respectively.The kinetic analysis indicated that the pseudo-first-order kinetic model described their degradation processes well.The degradation rate constants（k） are 0.0064 min-1,0.0138 min-1 and 0.0155 min-1,respectively,and their half-life（t1 /2） are 108.30 min,50.23 min and 44.72 min,respectively.In addition,the byproducts from the three antibiotics photolysis were analyzed using highperformance liquid chromatography mass spectrometry（LC-MS）,and the possible degradation pathways of the tested antibiotics were proposed.

关 键 词：四环素 土霉素 红霉素 光降解 

分 类 号：X50[环境科学与工程—环境工程]