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.%Heterostructured CeO2/TiO2 composite nanofibers were prepared via combination of hydrother-mal growth and electrospinning technique.The morphology and structure of CeO2/TiO2 composite nanofi-bers were characterized by X-ray diffraction（XRD）,Raman microscope（Raman）,scanning electron mi-croscopy（SEM） and transmission electron microscopy（TEM） and Brunauer-Emmett-Teller surface area（BET） analysis.The catalytic properties of the sample were studied via rhodamine B degradation as the model reaction.The results showed that CeO2 nanoparticles could evenly grow on the TiO2 nanofibers sur-face and thus heterostructured CeO2/TiO2 composite materials were successfully obtained.By selecting dif-ferent alkaline source,CeO2/TiO2 heterostructures with different morphology of CeO2 nanostructures were facilely fabricated.The CeO2/TiO2 heterostructures showed enhanced photocatalytic efficiency compared with the bare TiO2 nanofibers under UV light irradiation.This is due to the reason that the presence of CeO2 nanostructures on TiO2 nanofibers can increase its surface area,and effectively achieve the separation of photoelectrons and holes,and thus enhancing the system＇s quantum efficiency.Last,the mechanism for the enhancement of photocatalytic activity of heterostructured nanofibers was discussed.
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