Al掺杂TiO_2介孔材料的合成、表征和光催化性能  

Synthesis,charaterization and photocatalytic activities of Al-doped TiO_2 mesoporous materials

作　　者：刘国聪[1,2] 董辉[1] 刘少友[3] 

机构地区：[1]玉林师范学院新材料研发与化学生物传感技术所,玉林537000 [2]中南大学化学化工学院,长沙410083 [3]贵州凯里学院应用化学研究所,凯里556000

出　　处：《中国有色金属学报》2011年第12期3100-3107,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(21061006;51162026);中南大学博士后基金资助项目(133274341015501);湖南省自然科学基金资助项目(08JJ3104);广西自然科学基金资助项目(2010GXNSFB013018;2011GXNSFA018049);中国博士后基金资助项目(20100480949);中国博士后特别资助项目(201104509)

摘　　要：以钛酸四丁酯为钛源、十八水硫酸铝为铝源、三乙醇胺为模板剂,采用研磨-溶胶技术合成了Al掺杂的TiO2介孔材料,并利用XRD、EDS、TEM、BET、UV-vis和IR等手段表征了材料的结构、形貌、比表面积、孔径分布及光学性能。结果表明:Al掺杂能够减小TiO2光催化剂的粒径,提高介孔TiO2的热稳定性;Al掺杂TiO2介孔材料的平均孔径为4.5 nm,比表面积达到110.2 m2/g;相比商用P25和介孔TiO2,Al掺杂介孔TiO2的吸收边发生红移,对初始浓度为20 mg/L的甲基橙进行催化降解1 h后,其降解率达到92.5%。Abstract： Using tetrabutyl orthotitanate （TBOT） as Ti source, Al2（SO4）2· 18H20 as A1 source and triethanolamine as atemplate, Al-doped TiO2 mesoporous materials were synthesized via grinding-sol-gel method. The structure, morphology, crystalline size, specific surface area, pore size and photocatalytic activity of the as-prepared samples were characterized by X-ray diffractometry, high-resolution transmission electron microscopy （HRTEM）, N2 adsorption desorption and UV-vis spectrometer （UV-vis） techniques. The results show that Al-doped TiO2 has the wormhole-like mesoporous structure, and the A1 doping can not only decrease the particle size of nanoparticles, but also improve the stability of the mesoporous TiO2. The specific surface areas and the average pore diameter ofAl-doped TiO2 is about 110.2 m2/g and 4.5 nm, respectively. Compared with P25 and mesoporous TiO2, the gap adsorption edge of Al-doped TiO2 mesoporous materials exhibit a little red shift, the degradation ratio of which can be up to 92.5% during the photodegradation of methyl orange with the initial concentration of 20 mg/L for 1 h.

关 键 词：TIO2 AL掺杂 介孔材料 光催化剂 

分 类 号：O614.33[理学—无机化学]