p-n型异质结催化剂Ag2O-BiVO4对微囊藻毒素(MC-RR)的光化学氧化机理研究

ChineseJournalofCatalysis38(2017)192-198催化学报2017年第38卷第2期|www.cjcatal.orgELSEVIERavailableatwww.sciencedirect.comScienceDirectjournalhomepage:www.elsevier.com/locate/chnjcArticle(SpecialIssueontheInternationalSymposiumonEnvironmentalCatalysis(ISEC2016))Photochemicaloxidationmechanismofmicrocystin-RRbyp-nheterojunctionAg/Ag2〇-BiV〇4ChunhongWua,b,c,d,YanfenFang气ArayaHailuTirusewb,c,MiaomiaoXiang气YingpingHuangb，c，1*,ChunchengChenb，c，#aCollegeofbiologyandpharmacy,ChinaThreeGorgesUniversity,Yichang443002,Hubei,ChinabInnovationCenterforGeo-HazardsandEco-EnvironmentinThreeGorgesArea,Yichang443002,Hubei,ChinacEngineeringResearchCenterofEco-environmentinThreeGorgesReservoirRegion,MinistryofEducation,ChinaThreeGorgesUniversity,Yichang443002,Hubei,ChinadMedicalCollegeofChinaThreeGorgesUniversity,Yichang443002,Hubei,ChinaARTICLEINFOArticlehistory:Received25September2016Accepted23October2016Published5February2017Keywords:Photochemicalp-nheterojunctionSilverSilveroxideBismuthorthovanadateMicrocystin-RR(MC-RR)MechanismABSTRACTMicrocystin-RR(MC-RR),aformofmicrocystinwithtwoargininemoieties,isacyanobacterialtoxinthathasbeendetectedacrossawidegeographicrange.Itisagreatconcerngloballybecauseofitspotentiallivertoxicity.Herein,theabilitiesofBiV〇4,Ag-BiV〇4,Ag2〇-BiV〇4andAg/Ag2〇-BiV〇4tophotocatalyticallydegradeMC-RRundervisible-lightirradiation(入》420nm)wereinvestigatedandcompared.Thepossibledegradationpathwayswereexploredthroughanalysisofthereactionintermediatesbyhigh-performanceliquidchromatography-massspectrometry.TheresultsshowedthatthepresenceofAg0enhancedthephotocatalyticefficiencyofAg/Ag2〇-BiV〇4viaasynergeticeffectbetweenAg2〇andAg0atthep-nheterojunction.Moreover,thepresenceofAg0alsogreatlypromotedtheadsorptionofMC-RRonthephotocatalystsurface.ToxicologicalexperimentsonmiceshowedthatthetoxicityofMC-RRwassignificantlyreducedafterphotocatalyticdegradation.©2016,DalianInstituteofChemicalPhysics,ChineseAcademyofSciences.PublishedbyElsevierB.V.Allrightsreserved.1.IntroductionThegrowthofblue-g