Fabrication of magnetically recyclable SnO2-TiO2/CoFe2O4 hollow core-shell photocatalyst: Improving photocatalytic efficiency under visible light irradiation

TiO2 is a highly efficient semiconductor photocatalyst, in order to solve the problem of low visible light utilization of TiO2 nanoparticles and separation and recovery from suspension systems. In this paper, Sn-Ti/Co multi-composite photocatalysts were prepared by sol-gel method and layer-by-layer self-assembly method with tetrabutyl titanate and stannous chloride as main raw materials. The samples were characterized and analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), solid ultraviolet visible diffuse reflection (UV-Vis DRS), fluorescence (FL), ultraviolet visible absorption (UV), vibration sample magnetic Method such as strong meter (VSM). It is concluded that the TiO2 maintains a good anatase phase structure in the Sn-Ti-Co multi-composite catalyst. Under UV light and sunlight, the degradation rate of the catalyst reaches 100% for 90 min and 83.91% for 120 min, respectively, for Rhodamine B (10 mg/L) reaction system. And after repeated use for five times, it still shows better regeneration and reuse.