CNTs_PMS高级氧化体系去除水中的环丙沙星

化工进展CHEMICALINDUSTRYANDENGINEERINGPROGRESS2019年第38卷第4期CNTs/PMSCNTs/PMS高级氧化体系去除水中的环丙沙星陈一萍，夏管商，郑朝洪，吴思（泉州师范学院资源与环境科学学院，福建泉州362000）摘要：针对当前抗生素废水处理的难题，以环丙沙星（CIP）为研究对象，采用碳纳米管（CNTs）活化过硫酸氢盐（PMS）对其进行降解。考察了PMS浓度、CIP浓度、CNTs投加量、初始pH等因素对CIP降解效果的影响。研究结果表明，在pH为2.73～11.38范围内，PMS的浓度为1.5mmol/L、CNTs投加量为15mg/L时，初始浓度为5mg/L的CIP降解效果达到最佳，CNTs在反应过程中集吸附和催化于一体，且作为催化剂可实现多次循环利用。借助电子顺磁共振捕获技术和自由基猝灭反应对降解过程中的活性物质进行分析与鉴定，实验结果表明，在整个反应体系中起主导作用的活性基团是硫酸根自由基（SO4•-）。通过中间产物分析，发现氧化反应主要发生在哌嗪基团、喹诺酮核心的C－F键及环丙烷环上。这些结果可应用于抗生素废水的工业处理。关键词：环丙沙星；硫酸根自由基；高级氧化体系；碳纳米管；过硫酸氢盐中图分类号：X522文献标志码：A文章编号：1000-6613（2019）04-2037-09Degradationofciprofloxacinbyadvancedoxidationprocesswithcarbonnanotubes/peroxymonosulfateCHENYiping，XIAGuanshang，ZHENGChaohong，WUSi(SchoolofResourcesandEnvironmentScience,QuanzhouNormalUniversity,Quanzhou362000,Fujian,China)Abstract:Inviewofthecurrentantibioticwastewatertreatmentproblem,ciprofloxacin,asaselectedantibiotic,wasdegradedwithadvancedoxidationprocessbycarbonnanotubes(CNTs)-activatedperoxymonosulfate(PMS).TheeffectsofPMSdosages,initialCIPconcentrations,CNTsdosagesandpHontheremovalofCIPwereinvestigated.Theresultsshowedthatunderthecondition,[PMS]=1.5mmol/L,[CNTs]=15mg/Land[CIP]=5mg/L,theefficiencyofremovalCIPcouldbereachedabove90%inthewidepHrangeof2.73—11.38.Further,theCNTshadasynergisticeffectbetweenadsorptionandcatalysisinremovalofCIP.AndtheCNTsalsoshowedstablecatalyticactivityandcanbereusedasacatalystformanytimes.Meanwhile,theactivesubstancesinthedegradationprocesswereanalyzedandidentifiedbymeansofelectronparamagneticresonance(EPR)capturetechnologyandfreeradicalquenchingreaction.TheexperimentalresultsshowthatthemechanismofCIPdegradationisduemainlytosulfateradicals(SO4•-).Throughtheanalysisofintermediateproducts,itwasfoundthattheoxidationmainlyoccurredonthepiperazinegroup,theC-Fbondofthequinolonecoreandthecyclopropanering.Theseresultscanbeappliedtotheindustrialprocessofantibioticswastewater.Keywords:ciprofloxacin;sulfatefreeradicals;advancedoxidationprocess;carbonnanotubes;peroxymonosulfate化工进展20