摘要
采用溶胶-凝胶法制备铁、碘单掺杂及共掺杂的纳米晶TiO_2光催化剂,用X射线衍射(XRD)、X射线光电子能谱(XPS)和紫外可见(UV-vis)漫反射光谱对其进行表征,研究了其降解亚甲基蓝的光催化性能。结果表明,催化剂样品为锐钛矿相,平均粒径为7-15 nm.掺杂使样品的光吸收性能显著改善。掺杂I引起样品的晶粒尺寸减小和光吸收范围的拓展,导致其光催化活性显著提高;对于共掺杂样品,随着Fe掺杂量的增加,其光催化活性呈现先增加后减小的变化趋势,掺杂量为0.2%的光催化性能最好.根据Fe引入后样品晶粒尺寸、光吸收性能及能带结构等因素的变化,对其光催化性能变化的机制进行了讨论.
Iron and iodine single doped and co-doped TiO2 nanocrystalline were prepared by the sol–gel method and investigated by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and ultraviolet-visible （UV-Vis） diffuse reflectance spectroscopy, respectively. The photocatalytic properties of the samples were evaluated by photocatalytic degrading methylene blue. The results show that all the samples are compose of the anatase phase and the average grain size is 7–15 nm. After the doping, the absorption properties of the samples obviously enhanced. After introducing I into TiO2, the photocatalytic activity of the sample is greatly improved due to the decrease of grain size and extending of optical absorption region. With the increase of Fe doping level, the photocatalytic activities of the codoped samples increase and then decrease gradually. The best photocatalytic property is presented in the codoped sample with 0.2% Fe doping. The mechanisms of the photocatalytic property changes were further discussed by several factors
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2012年第6期661-666,共6页
Chinese Journal of Materials Research
基金
河南省科技厅科技攻关122102210229
河南大学省部共建SBGJ090505资助项目~~
关键词
无机非金属材料
铁
碘共掺杂
纳米晶TiO2
亚甲基蓝
光催化活性
inorganic non-metallic materials, Fe-l-codoped, nanocrystalline Ti02, methylene blue,photocatalytic activity
