Studies On The Photocatalyst Of Metal-Semiconductor Composite

Since the semiconductor photocatalyst was used to break down pollutants, more and more learned man paid attention to photocatalyst. But semiconductor(eg.titanium dioxide) has its own shorts such as:low photocatalyst activity, low efficiency of gion and so on. So can not be used into industry. The photocatalyst of metal-semiconductor composite is an important field, In this paper, we focus on the research for preparation and characteristic of metal-semiconductor composite, searching the effective ways of improveing the function, as follows:(1) The immersion method for synthesis of ultraviolet light and visible response Cu-Cu2O-CuO/AC light catalysts.In this experiment, blue copperas, activated carbon as raw materialS,synthesized by impregnation of Cu-Cu2O-CuO/AC photocatalyst. The absorption spectra, surface morphologies, crystalline structure, and interfacial properties of the above samples were investigated by XRD, TEM, XPS and XAES techniques. According to the XRD characterization results show, there are three kinds of copperas;By the pictures of TEM, active substances equably dispersed to AC surface. Through the XPS and XAES further confirmed the results.Through a series of experiments,the results showed that:10%of the copper loading and calcinations temperature of750℃,1.5hour baking time for the case of copper compound semiconductor optical catalytic activity to achieve the best results.(2) The ZnO@Zn photocatalyst were prepared using a one-step hydrothermal method. The absorption spectra, surface morphologies, crystalline structure, and interfacial properties of the above samples were investigated by XRD, SEM, PL and XPS techniques. By the pictures of SEM and XRD, we can catch the transformation of Zn. And the CTAB do little effect on the photocatalyst.(3) The Cu-ZnO@Zn nanocrystal composites were prepared using a one-step hydrothermal method. The absorption spectra, surface morphologies, crystalline structure, and interfacial properties of the above samples were investigated by XRD, SEM, XPS and XAES techniques. The results show that preferred plan is with blue copperas2.0%as starting material, temperature at160℃and hydrothermal2hours.Their photocatalytic activity was improved after doped. By the pictures of SEM and XRD, we can catch the transformation from Zn to ZnO.Through the XPS and XAES analysis, can further define the existing form.ZnO and CuO are on the surface.Above all, the preparation of Cu-Cu2O-CuO/AC and Cu-ZnO@Zn,we brought about the metal-semiconductor composite and P-N type semiconductor of doping, and improve the light activity of catalyst effectively.