La_2O_3掺杂低温合成介孔锐钛矿相二氧化钛

Synthesis of Mesoporous La_2O_3-Doped Anatase Nano-Scale TiO_2 at Low Temperature

采用非离子型表面活性剂EO20PO70EO20(P123)为模板剂,钛酸丁酯为钛源,La2O3为促进剂,无水乙醇为萃取剂,使用溶胶-凝胶法合成了具有锐钛矿相介孔结构和高比表面积的纳米TiO2。XRD,BET,IR和HRTEM等表征表明,La2O3的掺杂量对TiO2锐钛矿相的形成具有明显影响,当La2O3掺杂量为0.1%(摩尔分数)时,合成的TiO2锐钛矿相晶型最好,且为介孔结构,孔径大小均一,比表面积达到367.7 m2.g-1。

Mesoporous TiO2 nanocrystals with anatase phase and high specific surface area was synthesized by sol-gel process using nonionic surfactant EO20PO70EO20 as a structure-directing agent,C16H36Ti as Ti precursor,La2O3 as catalyst support and ethanol as an extraction agent.The results indicate that the amount of doped La2O3 greatly effects on the formation of TiO2 with anatase phase,and the optimal content of doped La2O3 is 0.1%(mole fraction).The characterizations of XRD,BET,IR and HRTEM show that an ordered mesostructure of TiO2 with narrow pore size distribution and large surface area(～367.7 m2·g-1) is obtained under the synthesis conditions.