Synthesis And Modification Of Titanium-based Photocatalyst With High Photocatalytic Activity

At present, TiO2-based photocatalytic materials in the application of cleaning up the environment more widely. However, the existing TiO2photocatalytic material there are many deficiencies, such as the response of the narrow wavelength range of light utilization is low, severe restrictions on the reaction and the reaction of light in the process of electron-hole on the composite rate and so on. Therefore, how to broaden the scope of TiO2, the wavelength of light response and to improve the catalytic efficiency and reduce the catalyst cost is the main researchers thought.In this paper, the conventional hydrothermal synthesis of photocatalytic TiO2, and the hydrothermal conditions were optimized. On this basis, the doping of titanium dioxide in research and immobilization. And using self-assembly of the light detection device degradation product of reactive blue simulated dye wastewater photocatalytic properties.1. With titanium sulfate as titanium source and sulfuric acid as inhibitor, the use of hydrothermal titanium dioxide photocatalyst. The effects of pH, hydrothermal time, temperature hydrothermal synthesis of factors on the catalytic activity of TiO2. The results show that hydrothermal synthesis of titanium dioxide optimal conditions:pH=9, hydrothermal time was180℃, hydrothermal time is16h. Obtained under these conditions, anatase titanium dioxide, and the crystal well, has good photocatalytic properties.2. Prepared by hydrothermal Ti-doping SnO2photocatalysts. Through the degradation of reactive blue dye wastewater simulation to study the Ti-doping SnO2light photocatalytic activity. The optimal synthesis conditions, such as initial pH-9, the optimal water temperature for heat160℃, then hydrothermal time4h, Sn/Ti-2:1. Ti-doping SnO2prepared photocatalytic activity than TiO2, have improved markedly. In addition, the use of hydrothermal vanadium-doped TiO2photocatalyst.The effects of vanadium content, hydrothermal temperature and hydrothermal time on the TiO2photocatalytic activity. The results show that the vanadium ion doped TiO2by photocatalytic activity significantly.3. By coprecipitation Cu-doping TiiO2photocatalyst. The effects of precipitant type, the initial Ti/Cu ratio and heat treatment temperature on the Cu-doping TiO2photocatalytic activity. Study found that when the initial Cu/Ti=1:1, oxalic acid precipitant,500℃under oxygen-rich reaction of4hours to obtain the maximum catalytic activity.4. Activated carbon prepared by impregnation of titanium dioxide photocatalyst load (TiO2/C). Found that TiO2/C catalyst still showed the same with the TiO2photocatalytic ability. The results of the catalyst nano-TiO2suspension system easy to join, difficult to separate problems of great significance.In summary, titanium dioxide photocatalyst by doping and immobilization can improve the photocatalytic rate of light and visible light generated response.