摘要
随着环境中抗生素的排入量增加,产生了各种环境问题,使得水环境中抗生素的降解研究成为众多学者的研究热点。本文采用反应条件温和、不引入新污染物的紫外/H_2O_2联合技术(UV/H_2O_2)对水体中的左旋氧氟沙星进行降解,通过控制H_2O_2投加量、初始pH值对降解过程进行研究,并探讨了其降解动力学过程。结果表明:(1)H_2O_2的投加有助于紫外光辐射下左旋氧氟沙星的降解,在实验条件下反应150 min,投加量为30 mmol/L时,反应速率最快,降解效率可达97.61%;(2)pH值的变化对降解效果的影响不大,但初始溶液偏弱酸性,有利于左旋氧氟沙星的降解;(3)UV/H_2O_2联合作用降解左旋氧氟沙星的过程满足一级反应动力学方程。
The increase of antibitics discharged into the environment results in a variety of environmental problems,with the antibiotic degradation being the focus of many scholars.This paper makes a summarization that the levofloxacin is removed by using UV/H_2O_2,which is of mild reaction condition without bringing secondary contamination to surroundings.And by controlling the dosage of hydrogen peroxide and the initial pH value of the degradation process are to explore the kinetic process of degradation.Results showed that：（1） Adding hydrogen peroxide can help remove the levofloxacin under the UV radiation,and the hydrogen peroxide of 30 mmol/L and the reaction time of 150 min,with the levofloxacin removed about 97.61%,and the degradation rate was the fastest;（2）there is little effect on the removal of levofloxacin in the different pH values;the change of pH value has little effect on the degradation,but the initial solution of weak acid is beneficial to the degradation of Levofloxacin;（3） the process of UV/H_2O_2 degradation of levofloxacin could be well described by the first-order reaction rate model.
出处
《西安理工大学学报》
北大核心
2017年第3期333-337,共5页
Journal of Xi'an University of Technology
基金
广东省水利科技创新项目(2015-06)
