Preparation,Characterization And Activity Evaluation The Composite Photocatalyst With TiO₂ And ZnO As The Matrix

TiN/F-TiO₂ was prepared by ball milling and using TiO₂, TiN and NH4F as the raw materials. BN/TiO₂ was prepared by ball milling and using TiO₂ and BN as the raw materials. CuO was synthesized by heat decomposition of Cu(NO₃)₂.3H₂O, then CuO/F-TiO₂ was prepared by ball milling and using CuO, TiN and NH4F as the raw materials. CaCO₃/ZnO photocatalyst was prepared by decomposition of zinc nitrate at different heat treatment temperatures and time. The photocatalysts were characterized by UV–Vis diffuse reflection spectrum, X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fluorescence spectra (FL), and Scanning electron microscopy (SEM), ransmission electron microscopy (TEM). The photocatalytic activity of the photocatalyst was evaluated by photocatalytic reduction of Cr₂O₇^2- and photocatalytic oxidation of methylene blue (MB) and rhodamine B (RhB). The results show that the optimum percentage of doped TiN is 0.2 wt% in the TiN/F-TiO₂ and the optimum ball milling time is 12 h. The optimum percentage of doped BN of BN/TiO₂ is 0.5 wt% and the optimum ball milling time is 0.5 h. When the doped amount CuO was 1.0 wt. % and the CuO/ F-TiO₂ show the optimal activity.The photocatalytic activity of the CaCO₃/ZnO was higher than that of ZnO.