铁掺杂介孔二氧化钛的制备及其光催化性能  

Synthesis and Photocatalytic Activity of Fe-doped mesoporous TiO_2 Powder

作　　者：唐守强[1] 何菁萍[1] 张昭[1] 

机构地区：[1]四川大学化工学院,成都610065

出　　处：《硅酸盐学报》2012年第7期951-956,共6页Journal of The Chinese Ceramic Society

基　　金：四川省环境保护科技计划项目(2009HDY007)

摘　　要：采用溶胶–凝胶法,以价廉的硫酸钛和硝酸铁为原料制备了不同含量的掺铁介孔二氧化钛。采用X射线衍射、扫描电子显微镜、热重–差示扫描量热分析、N2吸附–脱附、X射线光电子能谱、紫外–可见漫反射对样品进行表征。以亚甲基蓝(MB)为目标降解物,对催化剂的光催化性能进行了研究。结果表明:铁以Fe3+、Fe2+取代Ti4+进入TiO2的晶格。适量掺铁使TiO2的吸收带边发生红移,有利于提高样品光催化性能和保持良好的重复套用活性。最佳掺铁量(摩尔比)为n(Fe)/n(Ti)=2%,对应样品颗粒大小为0.1～0.2μm,比表面积为117.6 m2/g,孔容积为0.434 cm3/g,平均孔径为13 nm。重复套用4次后,240 min内对MB的总脱色率仍然达89.0%,降解率达70.7%。A Fe-doped TiO2 powder with the mesoporous structure was synthesized with Ti（SO4）2 as a raw material by a sol-gel method. The resultant samples were characterized by X-ray diffraction, scanning electron microscopy （SEM）, thermogravirnetry- differential scanning calorimetry, N2 absorption-desorption isothermal analysis, X-ray photoelectron spectroscopy and ultraviolet and visible spectrophotometry, respectively. The photocatalytic property of catalyst was investigated via the degradation of the methylene blue （MB） solution. The results show that Fe3＋ and Fe2＋ replace Ti4＋ and enter into TiO2 lattice. The appropriate content of iron can effectively enhance the absorption in the visible light region and the photocatalytic activity of TiO2. The optimum content of Fe doped （in mole） is n（Fe）/n（Ti）= 2%. The samples have the particle size of 0.1-0.2 μm, specific surface area of 117.6 m2/g, pore volume of 0.434 cm3/g and average pore size of 13 nm. The total decolorization rate and degradation rate of MB are 89.0% and 70.7% within 240 min after re-used for 4 times.

关 键 词：二氧化钛 铁掺杂 光催化 亚甲基蓝降解率 

分 类 号：O643[理学—物理化学]