三维大孔TiO2光催化剂的制备及其催化性能

 以聚甲基丙烯酸甲酯微球为模板,以钛酸正丁酯为原料,采用溶胶-凝胶法制备了具有三维结构的大孔TiO2. 采用差示扫描量热、热重-微分热重、X射线衍射、红外光谱、扫描电子显微镜和氮气吸附等手段对样品进行了表征. 结果表明,高温热处理后得到的三维大孔TiO2光催化剂的孔径为200 nm左右,孔径分布均匀, TiO2纳米晶粒中锐钛矿相和金红石相的含量分别为82%和18%. 光催化氧化实验表明,此种三维结构的TiO2对甲基橙溶液具有较好的光催化氧化性能.

Synthesis and Photocatalytic Activity of Macroporous TiO2 Photocatalyst with Three-Dimensional Structure

The macroporous TiO_2 photocatalyst was synthesized using spherical polymethyl methacrylate particles as the template and Ti(OBu)_4 as the raw material by the sol-gel method.The samples were characterized by differential scanning calorimetry,thermogravimetry-differential thermogravimetry,scanning electron microscopy,infrared spectroscopy,X-ray diffraction,and N_2 adsorption.The characteristic pore structure with about 200 nm spherical voids was obtained after calcination.The contents of anatase and rutile in the TiO_2 nanocrystals of the macroporous TiO_2 photocatalyst were 82% and 18%,respectively. The experiment of photocatalytic degradation of methyl orange showed that the macroporous TiO_2 photocatalyst has a high photocatalytic activity.