摘要
以钛酸异丙酯为钛源,吐温-60和十二胺为复合模板剂,通过控制反应液的pH值,采用溶胶-凝胶(Sol-G el)工艺合成出介孔T iO2前驱体,并通过热处理除去模板剂,得锐钛型介孔T iO2。合成产物采用粒度分布、SEM、TEM、XRD及等温N2吸附进行分析表征。研究表明:以硫酸为水解抑制剂,控制体系pH值为3,可以有效抑制钛酸异丙酯(TT IP)的水解缩聚速率,合成前驱体经热处理脱模后得锐钛型介孔T iO2,孔道有序度提高,介孔孔道收缩变小,晶粒尺寸L101=11.02 nm;颗粒粒度分布变窄,粒径减小,平均粒径为0.587μm;介孔T iO2孔径分布窄,平均孔径为4.0 nm,BET比表面积为143.2 m2/g,孔容0.16cm3/g。
The precursor of mesoporous TiO2 was prepared via Sol-Gel process by using a composite surfactant templates （Tween-60 and dodecylamine） as structure directing agent,titanium tetra-isopropoxide as titanium source. Mesoporous titania with anatase wall was obtained after removal of templates through thermal treatment. The prepared powder was analyzed by particle size distribution test, SEM, TEM, XRD and N2 absorption and desorption isotherm methods. By accommodating the pH value of the reaction system about 3,using sulfate acid as hydrolysis restraining agent,hydrolysis and poly-condensation reaction rate of TTIP solution on the micelle of composite surfactant templates was gradually controlled. The order of pores was improved after calcination, while the mesoporous structure was gradually shrinking and collapsing, with the anatase crystal size of 11.02 nm. And the particle size was reducing with the average particle size 0. 587 μm. Mesoporous titania has a narrow pore size distribution,with specific surface area of 143.2 m^2/g,average pore diameter of 4.0 nm and pore volume of 0.16 cm^3/g.
出处
《矿物岩石》
CAS
CSCD
北大核心
2006年第3期16-19,共4页
Mineralogy and Petrology
关键词
溶胶-凝胶法
介孔TIO2
复合模板剂
sol-gel process
mesoporous titania
composite surfactant templates
