Fe掺杂对纳米TiO2薄膜的结构与光催化性能的影响

采用溶胶-凝胶法制备了Fe掺杂的TiO2薄膜，利用X射线光电子能谱、X射线衍射技术、显微共聚焦拉曼光谱、紫外可见光谱和原子力显微镜等对薄膜进行表征，以甲基橙为反应模型对光催化活性进行测试。 结果表明，在300~600 ℃焙烧时，TiO2以锐钛矿结构存在，700 ℃焙烧时出现金红石结构。 随掺铁量和焙烧温度的增加，Fe/TiO2薄膜的表面粗糙度和晶粒尺寸均逐渐增大；随镀膜层数的增加，Fe/TiO2薄膜光谱吸收向可见光方向移动；较低含量的铁掺杂改善了TiO2薄膜的光催化活性，而较高含量的铁掺杂则使TiO2薄膜的光催化活性下降，掺铁量为0.1%时Fe/TiO2薄膜的光催化活性最好。

Effects of Fe-Doping on the Structures and Photocatalytic Activities of TiO2 Thin Films

The Fe-doped TiO2 films were prepared by sol-gel method and characterized by X-ray photoelectron spectroscopy(XPS), X-ray diffraction(XRD), confocal microscope Raman spectrometer(Raman), UV-Vis absorption spectroscopy(UV-Vis) and atomic force microscopy(AFM). The photocatalytic activities of the films were evaluated by using the degradation of the methyl orange. The results showed that TiO2 in Fe/TiO2 films took an anatase structure when calcinated between 300 ℃ and 600 ℃. Increasing the calcination temperature up to 700 ℃, TiO2 transformed to rutile phase. The roughness and the grain size of Fe/TiO2 films grew gradually with the increases of the doping amount of Fe content and the calcination temperature. The photon excited wavelength of the Fe/TiO2 films moved to the visible light gradually with the increase of number of coating layer. Low levels of Fe-doping improved the photocatalytic activities of the TiO2 thin films, while higher doping decreased the photocatalytic activities of TiO2 thin films. The optimal Fe-doping was found to be 0.1% for the maximum degradation of methyl orange.