复合模板剂下有序介孔TiO_2的制备研究  

Synthesis of Ordered Mesoporous TiO_2 on a Composite Surfactant Template

作　　者：王金忠[1] 赵岩[2] 张彩碚[1] 

机构地区：[1]东北大学理学院材料物理系 [2]中国科学院金属研究所,沈阳110016

出　　处：《物理化学学报》2003年第3期251-255,共5页Acta Physico-Chimica Sinica

基　　金：国家重大基础研究发展规划(G2000067205-4)项目

摘　　要：在复合模板剂聚氧乙烯十二烷基醚(Brij35)和聚乙二醇(PEG)下,制备出有序介孔TiO2.用XRD、HRTEM、SEM、FT-IR和N2吸附脱附等方法进行表征;并通过对反应过程中电导率和粘度的连续监测,分析有序介孔TiO2形成过程.研究表明,介孔TiO2为规整的六方排列结构,在低于400℃焙烧,有序结构稳定性高,比表面积达252m2·g-1,孔径3.4nm,晶型为锐钛矿;经500℃焙烧,有序介孔结构破坏,并开始出现金红石型晶相.有序介孔TiO2形成过程是基于在高极性介质中非极性的碳氢链聚集成为胶束,同时钛酸丁酯(TBOT)在已形成的胶束上聚集,在酸作用下不断水解缩聚而形成有序介孔结构,有效控制水解和聚合过程是控制介孔材料结构形成的关键.On a composite surfactant template(Brij35 and PEG), ordered mesoporous TiO2 was synthesized successfully. The formation of the ordered mesoporous TiO2 was analyzed by continuously monitoring the conductivity and viscosity during the reaction process, the ordered mesoporous TiO2 formed was characterized by XRD, HRTEM, SEM, FT-IR and N-2 adsorption and desorption methods. The results indicated that ordered mesoporous TiO2 was of a hexagonal packed structure, at a temperature below 400 degreesC, ordered mesoporous TiO2 has a higher thermal stability and a higher surface area of 252 m(2) (.) g(-1), the mesoporous pore diameter was uniform with a value of 3.4 nm and the crystal was in anatase phase. After TiO2 was calcined at 500 degreesC, ordered mesoporous structure was destroyed somewhat, and the formation of rutile phase appeared. The results also showed that liquid crystal template played a key role for the reaction, especially in a high polar media, in which non-polar carbon-hydrogen chain easily coagulated forming micelle, and TBOT gathered around the micelle formed, when they were acted by acid, reaction took place gradually to generate ordered mesoporous structure TiO2. It was found that taking efficient measures to control the hydrolysis and condensation processes of the reaction was the key of forming ordered mesoporous structure TiO2.

关 键 词：介孔TIO2 复合模板剂 电导率 粘度 胶束 

分 类 号：TQ134.1[化学工程—无机化工] O611.62[理学—无机化学]