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以钛酸丁脂为钛源,用溶胶-凝胶法制得催化剂前驱体,用超临界干燥法处理获得大孔及高比表面积的TiO_2超细颗粒,该样品在苯酚光催化降解反应中显示出优良的催化性能,其催化活性显著优于由直接干燥法处理获得的TiO_2颗粒,而且催化剂具有良好的热稳定性,即使经过973 K的高温焙烧,仍能保持良好的催化活性,结合催化剂的系列表征,包括XRD、TEM、氮气吸附-脱附等温线、XPS等,初步讨论了超临界干燥法对改善TiO_2光催化活性的结构因素。
Using titanium titanate as titanium source, the catalyst precursor was prepared by sol-gel method, and the superfine-sized TiO 2 ultrafine particles with high specific surface area were obtained by supercritical drying. The sample showed photocatalytic degradation in phenol Excellent catalytic performance, the catalytic activity is significantly better than the direct drying method obtained by the TiO 2 particles, and the catalyst has good thermal stability, even after 973 K calcination at high temperatures, still maintain good catalytic activity, combined with the catalyst series Characterization, including XRD, TEM, N2 adsorption-desorption isotherm, XPS and so on, discussed the structural factors of supercritical drying method to improve the photocatalytic activity of TiO2.