微乳法制备Fe-TiO_2纳米晶复合体及光催化性能  

Preparation and photoactivity of Fe-TiO_2 nanocrystalline composites by miniemulsion method

作　　者：马明远[1] 李佑稷[1] 陈伟[1] 李雷勇[1] 

机构地区：[1]吉首大学化学化工学院,吉首416000

出　　处：《环境工程学报》2010年第5期1041-1046,共6页Chinese Journal of Environmental Engineering

基　　金：湖南省教育厅青年基金项目(08B063);吉首大学研究生基金项目(08JDY022)

摘　　要：采用微乳法制备铁掺杂TiO2纳米晶(Fe-TiO2)复合体,通过热重-差热(TG-DTA)、X射线衍射(XRD)、扫描电镜(SEM)和紫外漫反射光谱(DRS)等对其结构和形态进行表征;以亚甲基蓝溶液(MB)为标准模拟降解物,对Fe-TiO2,纯TiO2和P25光催化降解性能进行评价。结果表明,Fe-TiO2的光催化活性明显>P25,原因是Fe掺杂不仅能抑制TiO2晶粒生长,提高TiO2的热稳定性和比表面积,而且能够拓展TiO2的吸收波长范围至可见光区,提高了Ti3+离子浓度,降低了光生载流子的复合几率。Nanocrystalline Fe-TiO2 composites were prepared by the miniemulsion method.The obtained photocatalysts were characterized by thermogravimetric-differential thermal analysis（TG-DTA）,x-ray diffraction（XRD）,scan electronic microphotograph（SEM） and diffuse reflection spectrum（DRS）.Photoactivities of Fe-TiO2,TiO2 and P25 were evaluated by degradation of methylene blue（MB） under UV irradiation.The results show that the photoactivity of Fe-TiO2 is more than that of P25.This is attributed to the fact that the addition of Fe not only retains crystalline growth,improves thermostabilities and surface areas of Fe-TiO2,but also shifts the excited wavelength of TiO2 to visible light regions,produces the high content of Ti3＋ ions and decreases recombination ratio of photo-generated current carrier.

关 键 词：Fe-TiO2 纳米晶复合体 亚甲基蓝 光催化活性 

分 类 号：X703[环境科学与工程—环境工程]