Synthesis And Properties Of TiO₂-based Bimetal Composites

Due to excellent physical and chemical properties, titanium dioxide has gained agreat success for environmental. However the low conversion efficiency of TiO2under visible light is due to the width of the band gap. To extend the spectral responseof TiO2into the visible region. Doping TiO2with metal oxide semiconductor (MoO3,WO3, ZnO) is one ways for sensitizing TiO2to visible light. Titanium dioxidenanoparticles can inhibit the grain growth of crystal particle, to form small particlecomposites and increase its surface area, improve the photoelectric properties. So inthis paper, series of TiO2-based series bimetal composites (TiO2-MoO3, TiO2-WO3,and TiO2-ZnO) were synthesized,and properties such as adsorption andphotocatalytic performance of products were investigated.TiO2-based series bimetal composites (TiO2-MoO3, TiO2-WO3,and TiO2-ZnO)were prepared by alcoholic solutions of titanium tetrachloride and deionized watersolution of ((NH4)6Mo7O24·4H2O, Na2WO4·2H2O and Zn(CH3COO)2) followed bya coprecipitation-hydrothermal treatment. Products were characterized by XRD andTEM. Finally, we test the adsorption properties and photocatalytic performance ofproducts. The results can be summarized as follows:1. TiO2-MoO3nanocomposites were prepared by a coprecipitation-hydrothermalmethod. The high proportion of TiO2-MoO3nanocomposites (nTi: nMo=0.25) showedexcellence adsorption activity for RhB and MB of organic dye. Furthermore, theTiO2-MoO3nanocomposites (nTi: nMo=0.5) has higher adsorption activity for theCr(VI) of heavy metal ion. Low proportion of compound (nMo: nTi=1%) showed goodphotocatalytic performance to RhB and MB.2. As-prepared TiO2-WO3nanocomposites with variable compositions bya coprecipitation-hydrothermal route. The products (nTi: nW=0.5) showed excellenceadsorption activity to MB and the products (nTi: nW=0.5and nTi: nW=1) showedgood photocatalytic performance to RhB. 3. We develop a facile one-step method for the synthesis of TiO2-ZnOnanocomposites with variable compositions. TiO2-ZnO nanocomposites (nTi: nZn=4)showed excellent adsorption activity to MB, TiO2-ZnO nanocomposites (nTi: nZn=1)showed good photocatalytic performance to RhB.