钴活化过硫酸盐降解水中左氧氟沙星的研究  

Study on Degradation of Levofloxacin in Water by Cobalt-activated Persulfate

作　　者：彭洪江 PENG Hongjiang(Shanghai Textile Architectural Design Research Institute Co.,Ltd.,Shanghai 200060,China)

机构地区：[1]上海纺织建筑设计研究院有限公司,上海200060

出　　处：《广州化工》2025年第5期149-152,共4页GuangZhou Chemical Industry

摘　　要：近年来水体中残留的抗生素已经引起了研究者的关注,采用基于钴离子活化PMS生成硫酸根自由基的方式氧化降解水中的典型氟喹诺酮抗生素左氧氟沙星(LEV),研究了钴离子浓度、PMS浓度、pH及水中常见离子等影响因子对反应的影响。研究表明,降解过程满足伪一级动力学氧化模型。随着初始PMS和钴离子浓度的增加,LEV的去除率也随之增加,在初始pH为5.21,钴离子的投加量为50μM,PMS投加量为0.5 mM时,LEV的去除率和降解动力学常数达到最大,分别为96.6%和0.206 9 min^(-1)。水中的氯离子对该体系降解LEV具有抑制作用,而硝酸根离子对降解过程无显著影响。碳酸氢根离子由于能够提供碱度,使体系pH值升高,从而显著提升LEV的降解速率,但对LEV的最终去除率并无显著促进作用。In recent years,the presence of residual antibiotics in water bodies has garnered significant attention from researchers.The degradation of levofloxacin(LEV),a typical fluoroquinolone antibiotic,in water was investigated through the oxidation process facilitated by the activation of peroxymonosulfate(PMS)by cobalt ions to generate sulfate radicals.The effects of various factors were studied,including cobalt ion concentration,PMS concentration,pH and common ions present in water on the degradation reaction.The findings indicated that the degradation process adhered to a pseudo-first-order kinetic oxidation model.As the initial concentrations of PMS and cobalt ions increased,the removal rate of LEV also rose.The highest removal rate and degradation kinetic constant for LEV were achieved at an initial pH of 5.21,with cobalt ion and PMS dosages of 50μM and 0.5 mM,respectively.Under these conditions,the removal rate and degradation kinetic constant of LEV reached maximum values of 96.6%and 0.2069 min^(-1),respectively.The study also revealed that chloride ions in water exhibited an inhibitory effect on the degradation of LEV within this system,while nitrate ions had no significant impact on the degradation process.Bicarbonate ions,due to their ability to provide alkalinity,increased the pH of the system,thereby significantly enhanced the degradation rate of LEV.However,they did not notably promote the overall removal rate of LEV.

关 键 词：过硫酸盐 钴离子 自由基 左氧氟沙星 

分 类 号：X52[环境科学与工程—环境工程]