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TiO2,(,,300384)[]。TiO2,4Cr()、Hg()、Pb()、Ag(),TiO2,TiO2。[];;;[]X703[]A[]1005-829X(2012)07-0009-06ResearchprogressintheremovalofheavymetalionsfromwastewaterbyTiO2photocatalysisYangYongfan,FeiXuening(TianjinKeyLaboratoryofWaterQualityScienceandTechnology,DepartmentofEnvironmentalandMunicipalEngineering,TianjinInstituteofUrbanConstruction,Tianjin300384,China)Abstract:Moreandmoreattentionhasbeenpaidtoenvironmentalgovernanceandpurificationbysemiconductorheterogeneousphotocatalysis.AnoverviewisgivenonthemechanismofTiO2photocatalyticremovalofheavymetalions.Fromtheangleofphotocatalyticreduction,theremovingcharacteristicsofphotocatalysisoffourprimaryheavymetalionsCr()、Hg()、Pb()、Ag(),andtheirinfluencingfactorsaresummarizedandanalyzed.FurtherunderstandingontheessentialdisciplinarianofTiO2photocatalysisisobtained.Attheend,theproblemsexistinginTiO2photocatalytictechniqueandthetrendofitsfuturedevelopmentarediscussed.Keywords:heavymetalions;photocatalyticreduction;titaniumdioxide;wastewater,。、、、、、。(、、、、)。,。3:(1)。、。(2)。、、、、。(3)。、〔1〕。12,,。3,,,,。。,TiO2、、、、〔2〕。TiO2,,TiO2,,。1TiO2。(ValenceBand,VB),(ConductionBand,CB),。,。32720127IndustrialWaterTreatmentVol.32No.7Jul.,20129,(e-),(h+),(),。,(),()。1。1。,(C);,(D);-(AB)。TiO2N,TiO23.2eV,388.5nm。TiO2,;,。H.Yoneyama〔3〕WO3、TiO2、SrTiO3,Cr(),。,TiO2〔4〕。TiO2:TiO2();,TiO2,,TiO2(、、)(),()(、)TiO2。〔5〕,Au()、Hg()、Pb()、Ag()、Cu()、Cu();Cr()、Fe()Cr()Fe();Cr()、Fe()、Cd()、Ni()、Mn()TiO2,,。,Ni()〔6〕、Cd()〔7〕,Mn()〔8-9〕。,:,、、。22.1TiO2TiO2、、pH。,pH。〔10〕,。,TiO2,TiO2,,。,TiO2,,TiO2,。,TiO2,(-)、(≤387.5nm)、(4%)、、。,,:(1)(),,,〔11-14〕。(2),〔15-17〕。(3),〔18〕、〔19〕。(4),〔7,20〕。,pH,TiO2,。TiO26.25〔21〕。pH6.25,TiO2;pH6.25,TiO2。,TiO2,;,TiO2,。TiO2,。pHTiO2,〔22〕pH:2012-07,32(7)10ECB(V)=-0.050-0.059pH(25℃)(1)EVB(V)=3.159-0.059pH(25℃)(2)(1)、(2),pH1,59mV,pH,TiO2,。,TiO2。2.2Cr(),、。HCrO4-、Cr2O72-()CrO42-(),。,,Cr(OH)3。,TiO2Cr6+Cr3+〔23〕,pHCr(OH)3。TiO2-Cr(),Cr()、pH、、。,TiO2,HCrO4-、Cr2O72-,Cr()。pH,Cr(),Cr()。,,。〔24〕30Cr()。,,Cr()。Cr(),Cr(),,。、Cr()TiO2,。〔25〕,PO43-〔26〕、SO42-、Cl-、NO3-Cr()TiO2,Cr()。Cr()。〔27〕Cu2+Cr2O72-TiO2,Cu2+Cu+,Cu+Cr2O72-,Cr2O72-Cr3+,Cu+Cu2+。Cu2+Cr2O72-TiO2,TiO2-,TiO2,Cr()。Mn2+,Mn2+〔28〕,Cr()()Cr()〔29〕。〔30-31〕,Cr()Cr()Cr()。,pH。〔26〕TiO2Cr(),TiO2Ti4+Ti3+,Cr()Ti3+,Cr()TiO2。J.J.Testa〔32〕,Cr()Cr(),Cr()Cr()Cr()。2.3Hg(),Hg2+、。,。Cr(),Hg+,Hg(0);〔33〕,。TiO2-Hg()pH、、。pHHg2+Hg2+。M.J.López-Mu觡oz〔34〕,(pH2、4.5)HgCl2;(pH=7)HgClOHHg(OH)2;(pH=10)Hg(OH)2。pH,Hg2+DegussaP25TiO2,,Hg2+5%,Hg2+40%;,Hg2+60%,Hg2+99%。Hg2+,,。JianhongZhou〔35〕〔36〕、EDTAHg2+TiO2。,,Hg2+EDTAHg2+TiO2。EDTAHg2+HgEDTA2-TiO2,EDTA()〔5〕,2012-07,32(7),:TiO211Hg2+。S.M.Lee〔37〕TiO2Hg2+,5。Hg2+。C.Miranda〔33〕TiO2。,N2、3min,;O2、5min。Hg2+,O2Hg2+TiO2Hg2+。2.4Pb(),,。Pb2+。TiO2Pb2+:Pb2+;(·OH,)Pb2+Pb4+,PbO2〔38〕。ZhengpengYang〔36〕TiO2Pb2+。Pb2+TiO2TiO2。pH,TiO2,Pb2+;H+,pH,Pb2+TiO2,。L.Murruni〔39〕TiO2Pb(),Pb()Pb(),Pb。Pb()Pb(hVB+·OH)。,(hVB+·OH)Pb()Pb(0),Pb()。(hVB+·OH)CO2·-〔40〕。N2,Pb2+。L.Murruni〔39〕、、、、TiO2Pb2+,TiO2,;·OHPb2+〔41〕。XRDXPS,TiO2。2.5Ag()Ag+、、。Ag+。,。D.Chen〔5〕,Ag+,,AgNO3Ag。TiO2Ag+,TiO2Ag+Ag(0)。TiO2、,Ag+。TiO2。3TiO2,;pH,。,;。TiO2,,。TiO2,,,、、、。,,、、。[][1]LitterMI.Heterogeneousphotocatalysis:Transitionmetalionsinphotocatalyticsystems[J].AppliedCatalysisB:Environmental,1999,23(2/3):89-114.[2]OllisDF.Photocatalyticpurificationandremediationofcontami-natedairandwater[J].ComptesRendusdel’AcadémiedesSciences-SeriesC-Chemistry,2000,3(6):405-411.[3]YoneyamaH,YamashitaY,TamuraH.Heterogeneousphotocatalyticreductionofdichromateonn-typesemiconductorcatalysts[J].Nature,1979,282:817-818.[4]BlakeDM.Bibliographyofworkontheheterogeneousphotocatalyticremovalofhazardouscompoundsfromwaterandair[R].NREL/TP-430-22197,NationalRenewableEnergyLaboratory,Golden,CO(UnitedStates),1997.2012-07,32(7)12[5]ChenD.Removaloftoxicmetalionsfromwastewaterbysemiconductorphotocatalysis[J].ChemicalEngineeringScience,2001,56(4):1561-1570.[6]LinWY,RajeshwarK.Photocatalyticremovalofnickelfromaqueoussolutionsusingultraviolet-irradiatedTiO2[J].JournaloftheElectrochemicalSociety,1997,144(8):2751-2756.[7]SkubalL,MeshkovN,RajhT,etal.Cadmiumremovalfromwaterusingthiolacticacid-modifiedtitaniumdioxidenanoparticles[J].JournalofPhotochemistryandPhotobiologyA:Chemistry,2002,148(1/2/3):393-397.[8]MingY,ChenthamarakshanC,RajeshwarK.Radical-mediatedphotoreductionofmanganese()speciesinUV-irradiatedtitaniasuspensions[J].JournalofPhotochemistryandPhotobiologyA:Chemistry,2002,147(3):199-204.[9]LozanoA,GarciaX.Heterogeneousphotocatalyticoxidationofmanganese()overTiO2[J].JournalofPhotochemistryandPhoto-biologyA:Chemistry,1992,69(2):237-240.[10],,,.TiO2———[J].,2000(4):11-13.[11]LiuSX,QuZP,HanXW,etal.Amechanismforenhancedphotocatalyticactivityofsilver-loadedtitaniumdioxide[J].Cata-lysisToday,2004,93/94/95:877-884.[12]TanTTY,YipCK,BeydounD,etal.Effectsofnano-AgparticlesloadingonTiO2photocatalyticreductionofselenateions[J].ChemicalEngineeringJournal,2003,95(1/2/3):179-186.[13]KankiT,YonedaH,SanoN,etal.Photocatalyticreductionanddepositionofmetallicionsinaqueousphase[J].ChemicalEnginee-ringJournal,2004,97(1):77-81.[14]MurruniL,LeyvaG,LitterMI.PhotocatalyticremovalofPb()overTiO2andPt-
本文标题:光催化去除废水中重金属离子的研究进展
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