臭氧法降解水中氟苯的动力学研究_何志桥

第21卷第2期高校化学工程学报No.2Vol.212007年4月JournalofChemicalEngineeringofChineseUniversitiesApr.2007文章编号：1003-9015(2007)02-0298-06臭氧法降解水中氟苯的动力学研究何志桥1,宋爽1,杨岳平2,徐新华2,陈建孟1(1.浙江工业大学生物与环境工程学院,浙江杭州310032;2.浙江大学环境工程研究所,浙江杭州310027)摘要：采用臭氧法降解含氟苯模拟废水。研究了氟苯降解的影响因素和动力学，考察了反应液初始pH值、反应物初始浓度、臭氧投量、反应温度对臭氧氧化降解氟苯反应速率的影响。结果表明，氟苯初始浓度0.52mmol⋅L−1，pH9，臭氧投量1.25×10−6mol⋅s−1，常温下反应60min后氟苯降解率达95％以上。氟苯在臭氧氧化下的降解符合表观一级动力学，采用幂指数方程描述反应动力学，得到方程C=C0exp(−0.324exp(−7437/RT)QO30.41C0−0.372[OH−]0.0942t)。通过GC-MS测定氟苯降解主要中间产物为苯酚、苯醌、呋喃二酮、亚联苯等。关键词：氟苯；臭氧氧化；中间产物；动力学中图分类号：X592；X703.1；X787文献标识码：AKineticsofFluorobenzeneDegradationbyOzoneinAqueousSolutionHEZhi-qiao1,SONGShuang1,YANGYue-ping2,XUXin-hua2,CHENJian-meng1(1.CollegeofBiologicalandEnvironmentalEngineering,ZhejiangUniversityofTechnology,Hangzhou310032,China;2.DepartmentofEnvironmentalEngineering,ZhejiangUniversity,Hangzhou310027,China)Abstract:Thedegradationoffluorobenzene(FB)byusingozonationprocesswasstudied,andtheinfluencesofpHvalue,initialconcentrationoffluorobenzene,ozonefluxandreactiontemperatureonthereactionkineticswereinvestigated.Experimentalresultsshowthattheozonationprocessiseffectivefordegradationoffluorobenzene,andFBcanberemovedupto95%after60minutestreatingwithozonefluxof1.25×10−6mol⋅s−1atpHvalueof9.0andtemperatureof25℃.Inallcases,thereactionoffluorobenzenedegradationbyozonefollowspseudofirst-orderkinetics.BasedontheconsiderationofthecontributionofpHvalue,initialconcentrationoffluorobenzene,ozonefluxandreactiontemperaturetotheozonationprocess,asimplifiedmechanisticmodelforfluorobenzenedegradationbyozonewasderived,andthekineticreactionequationwasfittedasanexponentialfunction:C=C0exp(−0.324exp(−7437/RT)QO30.41C0−0.372[OH−]0.0942t).Duringthedegradationoffluorobenzenebyozonationprocess,variousintermediateproductsweredetectedandidentifiedasphenol,benzonquinone,furandioneandbiiphenylenebyusingthehighperformanceliquidchromatography(HPLC)andgaschromatography-massspectrometry(GC-MS).Keywords:fluorobenzene;ozoneoxidation;intermediates;kinetics1前言氟苯(FB)是制备抗精神病特效药物