摘要
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。
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.
出处
《应用化学》
CAS
CSCD
北大核心
2011年第12期1379-1386,共8页
Chinese Journal of Applied Chemistry
基金
中国工程物理研究院科学技术发展基金(2009B030127)资助项目
关键词
Fe/TiO2薄膜
光催化降解
反应机理
甲基橙
Fe-doped TiO2 thin films
photocatalytic degradation
reaction mechanism
methyl orange
