以Stber法制备的单分散SiO_2微球为模板,率先采用静电吸附法和相吸附法相结合技术制备出SiO_2@TiO_2核壳结构微球。深入研究了pH值及煅烧温度对其结构和性能的影响。对SiO_2@TiO_2微球进行去核处理,得到TiO_2中空微球。通过降解常见工业污染物硝基苯来研究两种微球的光催化活性。采用XRD、SEM、TEM、BET、FT-IR对样品进行表征,用紫外-可见分光光度计测量硝基苯溶液降解前后的吸光度。结果表明,相同条件制备的TiO_2中空微球的比表面积比SiO_2@TiO_2微球的显著增大,最大为87m~2/g,导致TiO_2中空微球的光催化活性比SiO_2@TiO_2微球明显提高,对硝基苯的4h降解率可达95.2%。低于600℃处理得到的TiO_2壳层为锐钛矿相,呈孤岛状模式生长。温度升高到700℃时出现金红石相。在pH=9.0、600℃热处理3h条件下制备的SiO_2@TiO_2微球经去核处理所得到的TiO_2中空微球的壳层厚度最大,为25.4nm,且空心球的Ti-O-Si键随之消失。 Monodisperse SiO 2 microspheres prepared by Stber method were used as templates, and the microspheres of SiO_2 @ TiO_2 core-shell microspheres were firstly prepared by a combination of electrostatic adsorption and phase adsorption. In-depth study of the pH and calcination temperature on the structure and performance. SiO_2 @ TiO_2 microspheres were enucleated to obtain TiO_2 hollow microspheres. The photocatalytic activity of two kinds of microspheres was studied by degrading common industrial pollutant nitrobenzene. The samples were characterized by XRD, SEM, TEM, BET and FT-IR. The absorbance of nitrobenzene solution before and after degradation was measured by UV-visible spectrophotometer. The results showed that the specific surface area of ​​TiO 2 hollow microspheres prepared under the same conditions was significantly higher than that of SiO 2 @ TiO_2 microspheres, the maximum was 87m ~ 2 / g, which led to the obvious increase of photocatalytic activity of TiO_2 hollow microspheres , 4h nitrobenzene degradation rate of up to 95.2%. The TiO 2 shell treated under 600 ℃ is anatase phase and grows in an island-like pattern. The rutile phase appears when the temperature is raised to 700 ° C. The shell thickness of TiO_2 hollow microspheres prepared by enucleation of SiO_2 @ TiO_2 microspheres prepared at pH = 9.0,600 ℃ for 3h was 25.4nm, and the Ti-O-Si bonds of hollow spheres Disappear