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1、Ind.Eng.Chem.Res.2007,46,2741-27462741MATERIALSANDINTERFACESCarbonandNitrogenCo-dopedTiO2withEnhancedVisible-LightPhotocatalyticActivityDaimeiChen,ZhongyiJiang,JiaqingGeng,QunWang,andDongYang*KeyLaboratoryforGreenChemicalTechnology,SchoolofChemicalEngineeringandTechnology,TianjinUniVer
2、sity,Tianjin,300072,People'sRepublicofChinaToutilizevisiblelightmoreefficientlyinphotocatalyticreactions,carbon-dopedTiO2(C-TiO2),nitrogen-dopedTiO2(N-TiO2),andcarbonandnitrogenco-dopedTiO2(C-N-TiO2)nanoparticleswithdifferentnitrogenandcarboncontentswerepreparedbyasol-gelmethodandchara
3、cterizedbyX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),X-rayphotoelectronspectroscopy(XPS),andUV-visspectroscopy.XRDresultsshowedthatthedopingofCandNatomscouldsuppressthecrystalgrowthofTiO2,andtheeffectofCdopingwasmorepronouncedthanthatofNdoping.XPS,UV-visspectroscopy,andl
4、atticeparameteranalysisrevealedthatNatomscouldincorporateintothelatticeofanatasethroughsubstitutingthesitesofoxygenatoms,whilemostCatomscouldformamixedlayerofdepositedactivecarbonandcomplexcarbonatespeciesatthesurfaceofTiO2nanoparticles.ThephotocatalyticactivitiesofobtainedC-TiO2,N-TiO
5、2,andC-N-TiO2sampleswithdifferentCandNcontentswereevaluatedbymethylenebluedegradationundervisiblelightirradiation.ItwasfoundthatC-N-TiO2nanomaterialsexhibitedthehighestphotocatalyticactivity,whichcouldbeassignedtothesynergisticeffectofdopedCandNatoms.IntroductionN-TiO2latticeandthemech
6、anismofbandgapnarrowinghavebeenderived.Forexample,Asahietal.21proposedthatTitaniumdioxide(TiO2)isthemostwidelyusedphotocatalystsubstitutional-typedopingusingNwaseffectiveforthebandforthedecompositionofvariousorganicpollutantsbecauseofgapnarrowingofTiO2duetothemixingofN2pwithO2pitscheap
7、nessandnontoxicity,inadditiontoitshighactivity,statesinthevalencebandbasedonspin-restrictedlocaldensityopticalproperties,andchemicalstability.Thebandgapenergy22,23approximationcalculationsonanatase.AnotherviewpointofTiO2(3.0-3.2eV)requiresUVlightirradiation,andthusconfirmedthatinters
