三维有序介孔/大孔TiO2微球的制备、表征及光催化性能

以聚甲基丙烯酸甲酯微球为模板,分别以钛酸四丁酯和四异丙醇钛为钛源,通过溶胶-凝胶法辅助模板法制得TiO2纳米微球前驱体,并用程序升温控制其焙烧温度,最终成功制得了具有三维有序介孔/大孔复合结构的TiO2微球.以罗丹明B(RhB)为模型污染物,探索了以不同钛源制备得到的介孔/大孔复合TiO2微球的光催化性能;并采用XRD、SEM、TEM、UV-vis DRS、比表面积测试、光催化性能测试等对样品的晶粒尺寸、物相、形貌、光吸收、比表面积及性能等进行了分析.结果表明,运用溶胶凝胶法辅助模板法能够合成结晶度高、形貌规整、比表面积大、光催化活性良好的锐钛矿相TiO2微球.

Preparation, characterization and photocatalytic activity of Three-dimensionally Ordered Mesoporous/Macroporous TiO2 Mi-crospheres

Three-dimensionally ordered mesoporous/macroporous TiO2 microspheres were synthesized through sol-gel assisted template method using the self-made poly-(methyl methacrylate) (PMMA) microspheres as hard template, and two kinds of titanium source, such as titanium isopropoxide and tetrabutyl titanate, were used as metal precursor. On the basis of characterization results of XRD, SEM, TEM, UV-vis DRS and N2 adsorption/desorption, the morphology, optical absorption, surface area, pore distribution and catalytic activity of the as-prepared samples were systemically investigated. The characterization results reveal that the as-prepared TiO2 samples possess uniform microsphere structure, large surface area and high crystallinity. The obtained mesoporous/macroporous microspheres show the enhanced photocatalytic activity, which is found to be 90 % degradation efficiency of RhB with 10 mg/L concentration under UV light irradiation for 120 min.