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1、Availableonlineatwww.sciencedirect.comJOURNALOFENVIRONMENTALSCIENCESISSN1001-0742CN11-2629/XJournalofEnvironmentalSciences2013,25(6)10981106www.jesc.ac.cnEffectsofenvironmentalfactorsonsulfamethoxazolephotodegradationundersimulatedsunlightirradiation:Kineticsand
2、mechanismJunfengNiu,LilanZhang,YangLi,JinboZhao,SidanLv,KeqingXiaoStateKeyLaboratoryofWaterEnvironmentSimulation,SchoolofEnvironment,BeijingNormalUniversity,Beijing100875,ChinaReceived11September2012;revised04November2012;accepted19November2012AbstractToadvanc
3、etheknowledgeoftheenvironmentalfateofsulfamethoxazole(SMX),wesystematicallyinvestigatedtheeffectsofnaturalwaterconstituentsandsyntheticsubstances(i.e.,TiO2nanoparticles(nTiO2)andTi-doped-Bi2O3(NTB))onthephotodegradationkineticsofSMXunderxenonlampirradiation.Thep
4、hotolysisofSMXinaqueoussolutionfollowedfirst-orderkinetics.OurresultsshowedthathigherconcentrationsofSMX,fulvicacid,suspendedsediments,NTBandhigherpHvaluedecreasedthephotodegradationratesofSMX,whereasH2O2improvedtheSMXphotodegradation.TiO2nanoparticleshadadualeff
5、ectonphotodegradationduetotheirphotocatalyticactivityandphotoabsorptionofphotons.NointermediatesmoretoxictowardVibriofischerithanSMXwereproducedafterdirectphotolysisandphotocatalyticdegradationfor3hr.ThephotolysisofSMXinvolvedthreepathways:hydroxylation,cleavage
6、ofthesulfonamidebond,andfragmentationoftheisoxazolering.ThisstudylaysthegroundworkforabetterunderstandingoftheenvironmentalfateofSMX.Keywords:photodegradation;sulfamethoxazole;environmentalfactors;toxicityDOI:10.1016/S1001-0742(12)60167-3Introductiontransportat
7、ionandtransformationofSMXintheaquaticenvironmentisstilllimited.Sulfamethoxazole(SMX)belongstothesulfonamideclassInrecentyears,manypublishedreportsareavailableofantibacterialcompoundsandisextensivelyusedinonvariouschemical,physical,andbiologicaltreatmenthumanand
8、veterinarymedicine(Mookherjeeetal.,2012).techniquestoremoveSMXfromwastewater,suchasIna19992000USGSreconnaissanceofUSstreams,hydrolysis,sorption,andbiodegradation(Andreozziet
