左氧氟沙星的超声/H_2O_2联合降解研究

Degradation of levofloxacin by sonolysis-assisted H_2O_2 in aqueous solution

采用超声／H202高级氧化技术对喹诺酮类抗生素左氧氟沙星进行降解，考察了H2O2浓度、超声功率、溶液初始pH值对反应过程的影响．结果表明，与单独超声和H202氧化相比，超声／H2O2对左氧氟沙星具有明显的协同降解作用．H202添加浓度在3．0~20．0mmol／L范围，左氧氟沙星的降解率随其添加浓度的增加而增加；超声功率在260W时降解效果最佳；左氧氟沙星初始浓度在10~30mg／L范围内，左氧氟沙星的降解量随其初始浓度的增加而增加；超声／H2O2降解左氧氟沙星在未调节（pH7．14）效果最佳．HPLC分析发现降解过程主要有2种产物生成，产物的生成和分布受体系pH的影响较大．

An ultrasonic/H202 system was used to degrade levofloxacin, and some influencing factors such as H202 concentration, ultrasonic power and initial pH value were investigated. The results indicated that the ultrasonic/H202 system had a marked synergetic effect in the removal rate of levofloxacin compared with the single ultrasonic and the oxidation of H202. The degradation rate of levofloxcin increased with the increase of H202 concentration in the range of 3.0-20.0mmol/L, and an ultrasonic power of 260W could result into the optimum degradation rate. The degradation amount of levofloxacin increased with the increase of its initial concentration. The degradation rate of levofloxcin could reach a maximum value at initial pH 7.14 of the unbuffered solution. The high performance liquid chromatography spectrum results showed that two main products were generated during the reaction, however, which were dependent on the pH value of the solution.