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 hydrothermal growth and electrospinning technique. The morphology and structure of CeO₂/TiO₂ composite nanofibers were characterized by X-ray diffraction (XRD), Raman microscope (Raman), scanning electron microscopy (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 surface and thus heterostructured CeO₂/TiO₂ composite materials were successfully obtained. By selecting different 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 systems quantum efficiency. Last, the mechanism for the enhancement of photocatalytic activity of heterostructured nanofibers was discussed.