硫酸根自由基降解诺氟沙星动力学因子优化分析  

Optimal Analysis for Kinetics Factors on the Degradation of Norfloxacin Using Sulfate Radical

作　　者：刘洪位[1] 郭洪光[1,2] 付垚[1] 张永丽[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]同济大学水污染与控制国家重点实验室,上海200092

出　　处：《水处理技术》2016年第3期27-31,42,共6页Technology of Water Treatment

基　　金：国家自然科学基金项目(51508354);四川省环保科技计划项目(2013HB08);中央高校基本科研业务费(2082604184026);中央高校博士后经费项目(0030807602026);四川大学实验技术项目(0030505501Z31)

摘　　要：以第三代氟喹诺酮抗生素诺氟沙星(NOR)为目标,采用基于·SO4-的热活化过硫酸盐(PS)工艺对NOR降解过程中的温度、过硫酸盐浓度、pH、阴离子及探针物质等关键因子进行考察优化研究。结果表明,NOR降解符合拟1级动力学模型,且表观速率常数Kapp与PS浓度和温度具有较好的线型相关性,NOR降解的活化能EA为(85.92±12.11)k J/mol;初始PS浓度及反应温度的升高对诺氟沙星的降解速率呈现促进作用;降解反应的最佳p H为4.0,在pH>7情况下反应速率基本不发生改变;体系共存的Cl^-、NO_3^-及CO_3^(2-)对反应均存在不同程度抑制作用,且随着离子浓度升高,抑制作用加强。此外试验发现投加探针物质叔丁醇与苯酚可以有效鉴定不同体系下的自由基反应特性。In this study, norfloxacin, the third generation fluoroquinolone antibiotic, was selected as a target compound to be degraded by thermally activated persulfate（PS） based on the sulfate radical. The factors like temperature, persulfate concentration, anions and probe compounds were investigated and optimized. The results indicated that the degradation of NOR fitted the pseudo-first-order kinetic model and the apparent rate constant Kapp had a good linear correlation with PS concentration and temperature. The activation energy EA of NOR degradation was 85.92±12.11 k J/mol. The rise of initial PS concentration and temperature made a positive effect. The optimal p H value for the reactions was 4.0 and the reaction rates remained stable when p H7. The coexisting anions like chloride ion, nitrate and carbonate in the system would made varying degrees of inhibition which strengthened with the increase of anion concentration. Besides, the experiments found that the selected probe compounds tert-butyl alcohol and phenol could effectively identify the reaction characteristics of radicals in diverse systems.

关 键 词：诺氟沙星 过硫酸盐 影响因子 优化 动力学 

分 类 号：TQ031.7[化学工程] X703.1[环境科学与工程—环境工程]