中文摘要：

通过静电纺丝法制备出含有Fe3O4纳米微粒的TiO2纳米纤维,再采用浸渍还原法将Au纳米微粒嵌入到TiO2纳米纤维上,制备出一种具有较强磁性和良好可见光响应能力的复合光催化材料.采用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和紫外-可见固体漫反射光谱仪（UV-VisDRS）等对样品的结构和形貌进行表征,并以降解罗丹明B（RhB）为模型反应,考察了样品在可见光照射下的光催化性能.结果表明,嵌入Au纳米微粒可使复合纳米纤维在可见光下降解RhB时表现出非常好的降解速率和降解率;同时,将Fe3O4纳米微粒嵌入TiO2纳米纤维内部可以赋予材料较强的磁性,使材料便于分离和重复利用.

英文摘要：

TiO2 nanofibers embedded with Au and Fe3O4 nanoparticles,were prepared via a two-step route.Firstly,TiO2 nanofibers embedded with Fe3O4 nanoparticles were synthesized through electrospinning technique.Then the Au nanoparticles were embedded into the nanofibers after sufficient impregnation with HAu Cl4 solution.The structure and morphology of the composite were characterized by X-ray diffraction（XRD）,Scan electron microscopy（SEM）,transmission electron microscopy（TEM） and UV-Vis diffuse reflection spectra（UV-Vis DRS）.The photocatalytic efficiency of the compositc was tested under visible light irradiation using Rhodamine B（Rh B） degradation as the model reaction.The UV-Vis spectra reveal that the photo-adsoption ability,especially for visible light,was improved largely after embedding with Au nanoparticles,owing to the increased active surface area and active sites.Therefore,the TiO2 nanofiber composite exhibited superior photocatalytic efficiency with enhanced degradation efficiency and degradation rate under visible light.Moreover,embedding with Fe3O4 nanoparticles endowed the nanofibers with good magnetic property,which allowed overcoming the difficulty of separation and reutilization.