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1、2011年第69卷化学学报Vol.69,2011第21期,2597～2602ACTACHIMICASINICANo.21,2597～2602·研究论文·CeO2/TiO2复合纳米纤维的制备及光催化性能研究a,ba,ba,a李跃军曹铁平王长华邵长路*a(东北师范大学先进光电子功能材料研究中心长春130024)b(白城师范学院化学系白城137000)摘要采用静电纺丝技术和水热合成法制备了CeO2/TiO2复合纳米纤维.利用X射线衍射(XRD)、拉曼光谱(Raman)、扫描电镜(SEM)、透射电镜(TEM)和比表面积测定(BET)等分析测试手段对样品的形貌及结构进行了表征,并以罗丹明B
2、的脱色降解为模式反应,考察了样品的光催化性能.结果表明:CeO2纳米粒子均匀地生长在TiO2纳米纤维表面,形成了异质结构的CeO2/TiO2复合纳米纤维光催化材料.通过改变碱源,可以得到不同形貌的CeO2.CeO2的存在增加了TiO2纳米纤维的比表面积,有效地实现TiO2光生电子和空穴的分离,增强了体系的量子效率,与纯TiO2纳米纤维相比光催化活性明显提高.初步探讨了异质结的形成机理.关键词CeO2/TiO2复合纳米纤维;静电纺丝技术;水热合成;光催化FabricationandEnhancedPhotocatalyticPropertiesofCeO2/TiO2Composit
3、eNanofibersa,ba,ba,aLi,YuejunCao,TiepingWang,ChanghuaShao,Changlu*a(CentreforAdvancedOptoelectronicFunctionalMaterialResearch,NortheastNormalUniversity,Changchun130024)b(DepartmentofChemistry,BaichengNormalCollege,Baicheng137000)AbstractHeterostructuredCeO2/TiO2compositenanofiberswereprepared
4、viacombinationofhydrother-malgrowthandelectrospinningtechnique.ThemorphologyandstructureofCeO2/TiO2compositenanofi-berswerecharacterizedbyX-raydiffraction(XRD),Ramanmicroscope(Raman),scanningelectronmi-croscopy(SEM)andtransmissionelectronmicroscopy(TEM)andBrunauer-Emmett-Tellersurfacearea(BET
5、)analysis.ThecatalyticpropertiesofthesamplewerestudiedviarhodamineBdegradationasthemodelreaction.TheresultsshowedthatCeO2nanoparticlescouldevenlygrowontheTiO2nanofiberssur-faceandthusheterostructuredCeO2/TiO2compositematerialsweresuccessfullyobtained.Byselectingdif-ferentalkalinesource,CeO2/T
6、iO2heterostructureswithdifferentmorphologyofCeO2nanostructureswerefacilelyfabricated.TheCeO2/TiO2heterostructuresshowedenhancedphotocatalyticefficiencycomparedwiththebareTiO2nanofibersunderUVlightirradiation.ThisisduetothereasonthatthepresenceofCeO2nanostructuresonTiO2nanofiberscanincreaseits
7、surfacearea,andeffectivelyachievetheseparationofphotoelectronsandholes,andthusenhancingthesystem’squantumefficiency.Last,themechanismfortheenhancementofphotocatalyticactivityofheterostructurednanofiberswasdiscussed.KeywordsCeO2/TiO2compositen
