Au纳米粒子大小对AuTiO2薄膜光催化活性的影响甘玉琴

　　　　　　PETROCHEMICALTECHNOLOGY　　　　　2005346[]2004-12-25;[]2005-01-11。[](1983-),,,,0512-65112645。:,[e-mail]。[](90207026);(04KJB150120)。AuAu/TOi2甘玉琴,邹翠娥,杨　平,华南平,石恩娴,杜玉扣(,215006)[]-3AuTiO2。Au,-Au/TiO2,Au/TiO2,AuAu/TiO2。,TiO2,AuTiO2。8nmAuTiO2(38μA,TiO22.2)(3h92%,TiO21.5)。[];;;;;[]1000-8144(2005)06-0578-04　　　[]TQ426.8　　　[]A　　、,,[1]。TiO2、,TiO2[2]。,、。-。TiO2,,,,TiO2,-,[3]。Ag[4,5],Pt[6～8],Au[9～11]。Wolfgang[4]AgTiO2;Wang[6]Pt;Bamwenda[9]TiO2-AuTiO2-Pt;Subramanian[10]Au/TiO2Au。AuAu/TiO2。3Au,-3AuAu/TiO2,,AuAu/TiO2。1　1.1　Au3AuAu:(1)(PVP)HAuCl4,。NaBH4(n(PVP)∶n(HAuCl4)∶n(NaBH4)=15∶1∶15),3h,Au,Au(Ⅰ)[12]。(2)(MPA)NaBH4,HAuCl4(n(MPA)∶n(HAuCl4)∶n(NaBH4)=2∶1∶15),3h,Au,Au(Ⅱ)[13]。(3)0.01%HAuCl4,1%,15min,,,Au,Au(Ⅲ)[14]。1.2　TOi2Au/TOi2-TiO2:1mLTi(OBu)420mL,578　6.AuAu/TiO250mLPVP(1mol/LHNO3pH≈1.5),6h,TiO2。AuTiO2(w(Au)=1%),,AuTiO2。-Au/TiO2。:,,,,。TiO20.5h,,100℃10min,。,1h,Au/TiO2。1.3　(TEM):H-600,100kVAu。-(UV-Vis):TU-1800-Au/TiO2。:4cm×2.5cm()TiO230min,,,573K1h,TiO2。,,,0.05mol/LNaOH。500W,(CHI660B)(I～t)。1.4　Au/TOi2Au/TiO20.5h,。,-λ=665nm。5,,,。λ=665nm,(D)。D=A0-AA0×100%,A0,A。2　2.1　TEM　　3AuTEM1。1,Au(Ⅰ)4nm,Au(Ⅱ)8nm,Au(Ⅲ)12nm。(a)Au(Ⅰ)(b)Au(Ⅱ)(c)Au(Ⅲ)1　AuFig.1　TEMphotosofAunanoparticlesofdifferentsizes.2.2　UV-Vis2AuTiO2300℃-。2,AuTiO2,380nm,AuTiO2。2.3　Au/TOi23、0.75V,AuTiO2300℃。3,AuAu/TiO2579　　　　　　PETROCHEMICALTECHNOLOGY　　　　　200534。TiO2,AuAu/TiO2。TiO217μA,8nmAu,Au/TiO238μA,TiO22.2。Au,Au/TiO2。2　AuTiO2300℃UV-VisFig.2　UV-VisspectraofTiO2membranesloadedwithAunanoparticlesdifferentsizesafterheattreatmentat300℃.Aunanoparticlessize:a.0;b.4nm;c.8nm;d.12nm3　AuTiO2300℃Fig.3　Photocurrent～timerelationshipsofTiO2membranesloadedwithAunanoparticlesdifferentsizesafterheattreatmentat300℃.Aunanoparticlessize:a.0;b.4nm;c.8nm;d.12nm2.4　Au/TOi2AuAu/TiO2,4。4,AuTiO2TiO2。8nmAuTiO2,92%,TiO21.5。-Au/TiO2,AuTiO2。TiO2FermiAu,TiO2Au,Fermi。AuAu,,,[1]。Au,,,TiO2,TiO2Au,-,,8nmAu12nmAuTiO2。Au,Fermi,TiO2Fermi,,[10],Au,TiO2Au。Au,Au/TiO2,8nmAu4nmAuAu/TiO2。3,8nmAuTiO2,-,。4　AuAu/TiO2(300℃)Fig.4　EffectofAunanoparticlesizeonphotocatalyticactivityofAu/TiO2membranesafterheattreatmentat300℃.Aunanoparticlessize:a.0;b.4nm;c.8nm;d.12nm3　-AuTiO2。TiO2,AuTiO2。Au8nm,Au/TiO2。580　6.AuAu/TiO2　　　1　,,..:,20022　,,.TiO2.,2003,32(3):247～2503　,,.AgTiO2.,2004,25(2):133～1374　WolfgangG,AngelikaB,HerbertH,eta.lStructuralPropertiesofAg/TiO2CatalystsforAcroleinHydrogenation.JPhysChemB,2004,108:5709～57175　,,.Ag/TiO2.,2003,24(11):877～8806　WangCY,RonaldP,DetlefWB,eta.lQuantumYieldofFormal-dehydeFormationinthePresenceofColloidalTiO2-BasedPhoto-Catalysts:EffectofIntermittentIllumination,Platinization,andDeoxygenation.JPhysChemB,2004,108:14082～140927　SiemonU,BahnemannD,TestaJJ,eta.lHeterogeneousPhotocata-lyticReactionsComparingTiO2andPt/TiO2.JPhotochemPhotobiol,A,2002,148:247～2558　BoS,AlexanderVV,PanagiotisGS.RoleofPlatinumDepositedonTiO2inPhenolPhotocatalyticOxidation.Langmuir,2003,19:3151～31569　BamwendaGR,TsubotaS,NakamuraT,eta.lPhotoassistedHydrogenProductionfromaWater-EthanolSolution:ACompar-isonofActivitiesofAu-TiO2andPt-TiO2.JPhotochemPhoto-biol,A,1995,89:177～18910　SubramanianV,WolfEE,KamatPV.InfluenceofMetal/MetalIonConcentrationonthePhotocatalyticActivityofTiO2-AuCompositeNanoparticles.Langmuir,2003,19:469～47411　SubramanianV,WolfEE,KamatPV.CatalysiswithTiO2/GoldNanocomposites.EffectofMetalParticleSizeontheFermiLevelEquilibration.JAmChemSoc,2004,126:4943～495012　,,.Pt/Au.,2003,15(6):838～84013　,,.pH.,2003,14(4):16～1814　EnustunBV,TuekevichJ.CoagulationofColloidalGold.JAmChemSoc,1963,85(21):3317～3328EffectofAuNanoparticleSizeonPhotocatalysisPerformanceofAu/TOi2MembraneGanYuqin,ZouCui′e,YangPing,HuaNanping,ShiEnxian,DuYukou(DepartmentofChemistryandChemicalEngineering,SuzhouUniversity,SuzhouJiangsu215006,China)[Abstract]TiO2membranesloadedwithdifferentsizesofAunanoparticleswerepreparedbymixing-supersonicdispersionmethod.SizeofAunanoparticleswasmeasuredbyTEM.Au/TiO2membranewascharacterizedbyUV-Visandphotocurrentmeasuremen.tPhotocatalyticactivityofAu/TiO2membranewasevaluatedbydegradationofmethyleneblueunderUVradiation,andeffectofAunanoparticlessizeonphotocatalyticactivityofAu/TiO2membranewasdiscussed.PhotocurrentandphotocatalyticactivitiesofTiO2membranestrengthenedafterloadingAunanoparticlesofdifferentsizesonthemembrane.When8nmAunanoparticleswereloadedonit,photocurrentandphotocatalyticactivitiesofAu/TiO2membranereachedmaximum.Theformerwas38μA,2.2timesasthatofpureTiO2membrane.Thephoto-degradationconversionofmethylenebluereached92%in3hours,1.5timesasthatofpureTiO2membrane.[Keywords]Aunanoparticle;titaniumdioxide;membrane;photocatalysis;methyleneblue;photocurrent(　)《》2003《》:780,0.430,,。2003《》:1136,0.5753,,;。2003《》:Web23177,。《》581