锐钛矿型TiO_2/SiO_2复合氧化物的制备

Preparation and Characterization of TiO_2/SiO_2 Composites

以硅灰石为硅源、硫酸钛为钛源,在未添加任何表面活性剂的制备条件下得到较高比表面积的多孔锐钛矿型TiO2/SiO2复合氧化物.反应过程中生成微溶于水的CaSO4,在复合物孔隙的形成中起重要作用.利用XRD,TEM,N2吸附和脱附对复合物的微观结构和化学组成进行了表征.

ZiO2-SiO2 composites with large specific surface areas （ up to 308.6 m^2/g） were synthesized from wollastonite and titanium sulfate in the absence of any surfactants under finely tuned several experimental conditions. Calcium sulphate, as a faintly soluble substance in water, plays an important role in the formation of pores in the nanocomposites. The microstructure and chemical composition of nanocomposites were characterized by means of X-ray diffractometry, transmission electron microscopy and N2 adsorption and desorption analysis. The as-prepared titanium dioxide-silicon dioxide nanocomposites with high specific surface areas and well-crystallized anatase contents could be used as an efficient photocatalyst.