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采用阳离子聚苯乙烯(PS)微球为模板,以钛酸丁酯为前驱体经溶胶凝胶反应制备了TiO2/PS复合微球,并经高温煅烧得到单分散中空TiO2纳米微球。采用扫描电镜(SEM)、透射电镜(TEM)、红外光谱仪(FT-IR)、X射线衍射仪(XRD)和紫外-可见分光光度计(UV-VIS DRS)对复合和中空微球的结构和光催化性能进行了表征。结果表明,经高温煅烧后TiO2中空微球尺寸相对于复合微球收缩了约25%,其粒径约为100 nm;中空微球壳层厚度可随钛酸丁酯用量而变化,壳层呈锐钛矿和金红石混晶结构,同时中空微球表现出比P25纳米TiO2更强的甲基橙光降解特性。
The cationic polystyrene (PS) microspheres were used as templates to prepare titania / PS composite microspheres by sol-gel reaction using butyl titanate as a precursor and calcined at high temperature to obtain monodisperse hollow TiO2 nanospheres. The structure and light of the composite and hollow microspheres were characterized by SEM, TEM, FT-IR, XRD and UV-VIS DRS. Catalytic performance was characterized. The results show that the size of TiO2 hollow microspheres shrinks about 25% relative to the composite microspheres after calcination at high temperature, and the particle size is about 100 nm. The thickness of hollow microsphere shell changes with the dosage of butyl titanate, Anatase and rutile mixed crystal structure, while the hollow microspheres showed stronger photodegradation of methyl orange than P25 nanometer TiO2.