电子束辐照降解水中氧氟沙星的研究

发布时间：2018-01-18 07:11

本文关键词：电子束辐照降解水中氧氟沙星的研究　出处：《中国环境科学》2016年10期 　论文类型：期刊论文

【摘要】：应用电子直线加速器初步探索了水体中氧氟沙星的辐照降解影响条件及降解机理.对初始浓度为20mg/L的氧氟沙星水溶液进行了辐照降解研究,分别选取了0.5kGy,1.0kGy,2.0kGy,3.0kGy,5.0kGy共5个剂量组,以研究辐照吸收剂量对降解效率的影响,同时分别对氧氟沙星水溶液进行空气饱和(水合电子清除剂)、氮气饱和、添加0.005mol/L及0.05mol/L氯化钠、添加0.05mol/L叔丁醇(羟基自由基清除剂)、添加0.005mol/L碳酸钠、添加0.005mol/L硫酸钠等方法进行处理,以探究降解过程中辐照水体产生自由基对氧氟沙星降解的贡献率.结果表明,以空气饱和进行处理,可提高氧氟沙星的降解率,辐照吸收剂量为2.0kGy时降解率可达99%.反之,加入氯化钠、叔丁醇和碳酸钠抑制了氧氟沙星的降解,加入硫酸钠则影响不大,表明羟基自由基在氧氟沙星降解中起关键作用.通过应用超高效液相色谱-质谱(UPLC-MS)对降解产物的分析鉴定,推测出了氧氟沙星的降解转化途径.
[Abstract]:The irradiation degradation conditions and degradation mechanism of ofloxacin in water were preliminarily investigated by electron linear accelerator. The irradiation degradation of ofloxacin aqueous solution with initial concentration of 20 mg / L was studied. In order to study the effect of irradiation absorbed dose on degradation efficiency, 0.5 kGy 1.0 kGy 2.0 kGy 2.0 kGy 3.0 kGy 5.0kGy dose groups were selected to study the effect of irradiation absorbed dose on degradation efficiency. At the same time, the solution of ofloxacin was saturated with air (hydrous electron scavenger, nitrogen saturation, 0.005 mol / L and 0.05 mol / L sodium chloride respectively). Adding 0.05mol / L tert-butanol (hydroxyl radical scavenger), adding 0.005mol / L sodium carbonate, adding 0.005mol / L sodium sulfate, etc. In order to explore the contribution of free radicals produced in irradiated water to the degradation of ofloxacin, the results showed that the degradation rate of ofloxacin could be increased by air saturation treatment. The degradation of ofloxacin was inhibited by sodium chloride, tert-butanol and sodium carbonate, but not by sodium sulfate. The results showed that hydroxyl radical played a key role in the degradation of ofloxacin. The degradation products were identified by UPLC-MS. The degradation and transformation pathway of ofloxacin was inferred.
【作者单位】：北京化工大学化学工程学院化工资源有效利用国家重点实验室;中国科学院高能物理研究所核技术应用研究中心;
【基金】：国家自然科学基金资助项目(11405184,11275216,11375212,11575210)
【分类号】：X703
【正文快照】： 抗生素类药物主要应用于人和动物的疾病治疗.抗生素的大量使用,不可避免地会造成抗生素进入环境,带来环境污染.抗生素具有抗生物降解能力[1],进入水体后会催生耐抗生素菌[2]并危害水生生物,对生态系统构成威胁.氧氟沙星是氟喹诺酮类抗菌药的一种,结构式如图1所示,它主要用于治

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