利用Sol-Gel法与水热合成法制备纳米TiO_2及其光催化活性研究

Preparation and photocatalytic activities of TiO_2 nanoparticles with sol-gel method and hydrothermal synthesis

以Sol-Gel法及水热合成方法制备了纳米TiO2,利用XRD进行了表征,以太阳光为光源,通过对亚甲基蓝溶液的降解反应,考察了两种方法所得样品的光催化活性。结果表明,利用水热合成法制备的锐钛矿型TiO2具有更小的粒径,而通过溶胶-凝胶制得的样品为混晶型TiO2,对亚甲基蓝降解具有较高的光催化活性。

TiO2 nanoparticles were prepared respectively by sol -gel method and hydrothermai synthesis technique. The structure characterization was performed by means of X - ray diffraction （XRD）. Based on the degradation on methylene blue under sunlight, the activities of two kinds of TiO2 nanoparticles were tested. The results showed that the titania prepared by sol - gel method was a mixture of anatase and futile, and the other was only of the anatase type by hydrothermai synthesis. The grain size of anatase TiO2 was smaller than the mixed crystal, but the photocataiytic efficiency was less than the mixed type. It can be concluded that the activity of the mixed crystal TiO2 particles was higher.