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17119992PHOTOGRAPHICSCIENCEANDPHOTOCHEMISTRYVol.17,No.1Feb.,1999研究快讯AgPdTiO2CH3CHO 姚晓斌 马 颖 姚建年*(,)(,100101)TiO2光催化,CH3CHO,表面修饰,离子效应TiO2,TiO2O2-H2O2.[1],TiO2Ag+Pd2+,H2O2.,TiO2SODH2O2[2],H2O2[3].,TiO2[47].,H2O2TiO2,CH3CHO,AgPdAg+Pd2+,TiO2CH3CHO,.11.1TiO2AerosilP25(,30nm,50m2/g).TiO2AgPd0.79%,Ag+Pd2+0.79%.1.2TiO23mg,33mL,pH5.60.1,,CH3CHO1mmolL-1,GC-103CH3CHO.22.1TiO2CH3CHO1TiO2AgPd,CH3CHO.2Ag+Pd2+CH3CHO.,19981117,19981123.*12TiO2CH3CHO,TiO2Ag/TiO2Pd/TiO2;Ag+Pd2+,TiO2.,TiO2,,.,[8,9],3.,-,1TiO2AgPdCH3CHOChangeofrelativeconcentrationofCH3CHOduringtheprocessofirradiationundernitrogeninTiO2(Ag/TiO2orPd/TiO2)aqueoussuspension2Ag+Pd2+CH3CHOChangeofrelativeconcentrationofCH3CHOinTiO2aqueoussuspension(withAg+orPd2+)withthetimeofirradiationundernitrogen,.,TiO2,-,.3TiO2Photo-oxidationandphoto-reductionprocessonTiO2surface,,CH3CHO,TiO2.,AgPdAg/TiO2Pd/TiO2,,,CH3CHO.Ag+Pd2+,TiO2CH3CHO,Ag+Pd2+,TiO2-,,.,12,,-,CH3CHO131:AgPdTiO2CH3CHO,TiO2.2.2TiO2CH3CHO4TiO2Ag/TiO2Pd/TiO2CH3CHO.5TiO2Ag+Pd2+CH3CHO.4TiO2AgPdCH3CHOChangeofrelativeconcentrationofCH3CHOduringthetimeofirradiationunderoxygeninTiO2(Ag/TiO2orPd/TiO2)aqueoussuspension5Ag+Pd2+CH3CHOChangeofrelativeconcentrationofCH3CHOinTiO2aqueoussuspension(withAg+orPd2+)withthetimeofirradiationunderoxygen14,TiO2CH3CHO.,TiO2O2-H2O2,-,CH3CHO.,Ag/TiO2Pd/TiO2,-.,Ag/TiO2Pd/TiO2TiO2.35,TiO2Ag+Pd2+,.,TiO2,H2O2;H2O2[1].H2O2TiO2CH3CHO.AugugliaroTiO2H2O2,TiO2,H2O2O2-HO2[11].H2O2(ads)+h+HO2+H+(1)H2O2(ads)+e-OH+OH-(2)CH3CHO,CH3CHO.45,,Ag/TiO2Pd/TiO2Ag+Pd2+TiO2CH3CHO,,.1417H2O2,H2O2TiO2.,H2O2Ag+Pd2+AgPdTiO2,-.,,Ag+Pd2+AgPd,CH3CHO.,Ag+Pd2+,TiO2CH3CHO.-,CH3CHO.,TiO2,H2O2,H2O2CH3CHO.AgPdTiO2,.1,,.TiO2H2O2.,(YaoXB,MaY,YaoJN.TheeffectofnoblemetalmodificationandadditionofiononthegenerationofH2O2intheTiO2aqueoussuspension.PhotographicScienceandPhotochemistry,inpress)2CaiR,HashimotoK,FujishimaA.Conversionofphotogeneratedsuperoxideanionintohydrogenperoxideintitaniumdioxidesuspensionsystem.J.Electroanal.Chem.,1992,326(12):3453503CaiR,KubotaY,ShuinT,etal.Inductionofcytotoxicitybyphoto-excitedTiO2particles.CANCERRESEARCH,1992,52:234623484KormannC,BahnemannDW,HoffmannMR.Photolysisofchloroformandotherorganicmoleculesinaqueoustita-niumdioxidesuspensions.Environ.Sci.Technol.,1991,25(3):4945005MineroC,MaurinoV,CampnellaL,etal.Photodegradationof2-ethoxy-and2-butoxyethanolinthepresenceofsemiconductorparticlesororganicconductingpolymer.Environ.Technol.Lett.,1989,10(3):3013106MatthewsRW.Photo-oxidationoforganicmaterialinaqueoussuspensionsoftitaniumdioxide.WaterRes.,1986,20(5):5695787OkamotoK,YamamotoY,TanakaH,etal.Heterogeneousphotocatalyticdecompositionofphenoloveranatasepowder.Bull.Chem.Soc.Jpn.,1985,58(7):201520228KraeutlerB,BardAJ.Heterogeneousphotocatalyticsynthesisofmethanefromaceticacid-newKolbereactionpath-way.J.Am.Chem.Soc.,1978,100:22392240;Heterogeneousphotocatalyticdecompositionofsaturatedcar-boxylicacidsontitaniumdioxidepowder.Decarboxylativeroutetoallcanes.J.Am.Chem.Soc.,1978,100:598559929IzumiI,FanFF,BardAJ.Heterogeneousphotocatalyuticdecompositionofbenzoicacidandadipicacidonplatinizedtitaniumdioxidepowder.J.Phys.Chem.,1981,85:21822310IzumiI,DunnWW,WilbournKO,etal.Heterogeneousphotocatalyticoxidationofhydrocarbonsonplatinizedti-taniumdioxidepowders.J.Phys.Chem.,1980,84(23):3207321011AugugliaroV,PalmisanoL,SclafaniA,etal.Photocatalyticdegradationofphenolinaqueoustitaniumdioxidedis-persions.Toxicol.Environ.Chem.,1988,16(2):89109151:AgPdTiO2CH3CHOTHEEFFECTSOFAg,PdANDAg+,Pd2+ONPHOTODE-GRADATIONOFCH3CHOCATALYZEDBYTiO2YAOXiaobin(InstituteofChemicalEngineering,AmakasuChemicalIndustries,Japan)MAYingYAOJiannian*(InstituteofPhotographicChemistry,TheChineseAcademyofSciences,Beijing100101,P.R.China)ABSTRACTPhotodegradationofCH3CHOcatalyzedbyTiO2wasacceleratedafterAg+orPd2+wasaddedintoTiO2aqueoussuspension.Undernitrogen,Ag+andPd2+onlyactedaselectronacceptorstoseparateelectronandholewell,whileunderoxygen,Ag+andPd2+notonlyactedaselectronacceptorsbutalsoincreasedH2O2producedbyilluminationinthesuspension.ButphotocatalyticactivityofTiO2wasonlyimprovedunderoxygenaftersur-facemodificationwasused.OurresultsshowthattheconcentrationofH2O2inthesuspen-sionhasgreateffectonphotodegradationofCH3CHOassistedbyTiO2.KeywordsphotocatalysisofTiO2,CH3CHO,surfacemodification,ioniceffect*Towhomcorrespondenceshouldbeaddressed.1617