摘要
在超临界CO2中以聚合物PEG2000为模板,正硅酸乙酯和钛酸四正丁酯为前驱体制备了TiO2/SiO2复合材料。研究了压力对插嵌率的影响,并对材料进行了XRD、FT-IR、N2吸脱附及SEM等表征。X射线衍射结果表明,产物由锐钛矿TiO2及结晶的SiO2组成。FT-IR图谱中,在935.5 cm-1处出现Ti—O—Si的吸收峰,说明TiO2/SiO2复合材料中TiO2和SiO2之间存在着键合作用。根据产物的N2吸附-脱附等温线计算,产物的比表面积可达97.19 m2/g,平均孔径为2 nm左右。SEM测试结果表明,不同分子量的PEG模板对产物的形貌有一定的影响。
TiO2/SiO2 composite material was prepared with PEG2000 as template and tetraethyl orthosilicate and tetrabutyl titanate as precursors in supercritical carbon dioxide （SC-CO2 ）. The effect of the pressure on the impregnating ratio was studied and the product was characterized by XRD, FT-IR, nitrogen adsorption- desorption experiment and SEM. The X-ray diffraction result shows that the product is a composite of anatase TiO2 and crystal SiO2. An absorption peak appears at 935.5 cm- 1, this band is ascribed to the vibration of Ti --O--Si bonds, which indicates the interaction of TiO2 and SiO2. The BET surface area calculated from the nitrogen adsorption isotherms of the product was up to 97.19 m2/g and the average pore diameter was about 2 nm. The SEM photographs of TiO2/SiO2 composite illustrate that the PEG with different molecular mass has a certain influence on the morphology of the product.
出处
《应用化学》
CAS
CSCD
北大核心
2008年第11期1281-1285,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(20404012)
河南省自然科学基金(0411020900)资助项目
