TiO_2光催化降解水中喹诺酮类抗生素  

Photocatalytic degradation of quinolone antibiotics in water using TiO_2

作　　者：刘利伟[1] 吴小莲[1] 莫测辉[1] 李彦文[1] 高鹏[1] 黄显东[1] 邹星[1] 黄献培[1] 

机构地区：[1]暨南大学环境工程系,广东省高校水土环境毒害性污染物防治与生物修复重点实验室,广东广州510632

出　　处：《中南大学学报（自然科学版）》2012年第8期3300-3307,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41173101);广东省科技计划项目(2010B020311006);惠州市科技计划项目(2009B010001009);广东省高校高层次人才项目(2010-794);广州市科技计划项目(2010A82070466)

摘　　要：研究TiO2光催化降解水中3种喹诺酮类抗生素的动力学特征,探讨TiO2用量、初始浓度、pH和水质对3种喹诺酮类抗生素光催化降解的影响。研究结果表明：当优化参数为TiO2用量1.0 g/L、抗生素初始浓度10 mg/L,pH=7时,反应80 min,3种喹诺酮类抗生素的降解率均在95%以上;光催化降解反应符合假一级反应动力学方程,反应速率常数为0.044 5~0.071 0,半衰期为9.76~15.57 min,降解难易程度从高到低的顺序为诺氟沙星、环丙沙星、洛美沙星;不同水质中诺氟沙星、环丙沙星的降解率从高到低的顺序为高纯水、河水、自来水,而洛美沙星的降解率从高到低的顺序为河水、自来水、高纯水。The efficiency of photodegradation of three quinolones in water by TiO2-catalysed irradiation was investigated through analyzing TiO2 dosage, initial concentration, the pH value and water quality on the photodegradation of quinolones. The degradation efficiency of quinolones is above 95% under the optimum conditions of TiO2 dosage 1.0 g/L, initial concentration 10 mg/L, and pH value 7.0 after 80 min of photodegradation. TiOE-catalysed UV photodegradation reaction of three quinolone compounds follows the pseudo-first-order kinetic formula, with reaction rate constants from being 0.044 5 to 0.071 0. The half-life periods are 9.76-15.57 min for lomefloxacin, ciprofloxacin and norfloxacin, which indicates that the photodegradation efficiency order are norfloxacin, ciprofloxacin, lomefloxacin. The photodegradation efficiencies of different quinolone compounds vary in various sources of water, with the descending order of ultra pure water, river water, tap water for both norfloxacin and ciprofloxacin, while the descending order of river water, tap water, ultra pure water for lomefloxacin.

关 键 词：抗生素 水污染 催化 降解 动力学 TIO2 

分 类 号：X52[环境科学与工程—环境工程]