水中磺胺类抗生素的光降解及富里酸对其光降解的影响  

Photodegradation of sulfa antibiotics and the impact of fulvic acids on it in water

作　　者：孙兴霞[1] 许毓[1] 

机构地区：[1]中国科学技术大学化学系,安徽合肥230026

出　　处：《中国科学技术大学学报》2013年第8期654-660,共7页JUSTC

基　　金：安徽省自然科学基金(11040606M47)资助

摘　　要：磺胺类抗生素是水环境中广泛存在的抗菌药物,光化学降解是其消减的重要途径.通过对两种磺胺类抗生素磺胺二甲基嘧啶和磺胺甲噁唑的光化学降解动力学研究,考察了其在纯水中的自敏化光降解过程以及溶解性有机物富里酸对其光化学降解的影响.结果表明,这两种磺胺类抗生素在纯水中的光化学降解反应均符合准一级动力学,但两者的自敏化光化学降解机理不同.水环境中富里酸浓度的大小会对其光化学降解产生重要影响:对于磺胺二甲基嘧啶,水中富里酸浓度较高(20,50,100mg/L)时会促进它的光降解,浓度较低时(2mg/L)不利于其光降解;对于磺胺甲噁唑,低浓度富里酸(0.2,2mg/L)会促进其光降解,高浓度富里酸(20,50,100mg/L)则抑制其光降解.Sulfa antibiotics are widespread antimicrobial agents in aquatic environments, and their primary degradation pathway is photodegradation. Through the research on the photochemical kinetics of sulfamethazine （SAD） and sulfamethoxazole （SMZ）, the self-sensitized photodegradation of two sulfa antibiotics in pure water and the effects o{ aqueous dissolved organic matter fulvic acids （FA） on photodegradation were investigated. In pure water, the photodegradation of the two sulfa antibiotics follows pseudo-first-order kinetics, but with different mechanisms. In addition, the photodegradation of the sul/a antibiotics are significantly influenced by the concentration of aqueous fulvic acids. For sulfamethazine, high concentrations of FA （20, 50, 100 rag/L） are favorable for the photodegradation of SAD whine low concentrations of FA （2 rag/L） would inhibit the photodegradation. For sulfamethoxazole, the presence of low concentration of FA （0. 2, 2 mg/L） slightly accelerates the degradation, whereas high concentrations of FA （20, 50, 100 mg/L） decrease the degradation rate of the compound, acids

关 键 词：磺胺类抗生素 紫外-可见光辐射 自敏化光解 富里酸 

分 类 号：X131.2[环境科学与工程—环境科学]