Preparation, Characterization And Study On Photocatalytic Activity Of Molybdenum And Carbon Codoped Titanium Dioxide Catalyst

Because of its advantage of stability, non-toxic and low cost, TiO2 has been applied widely in environmental treatment area. However, there are still some technical difficulties that we need to solve. On one hand, the relatively wide band gap of TiO2 makes itself can only absorb UV light and the utilization ratio of visible light is quite low. On the other hand, TiO2 can absorb the energy from solar light and produce photo generated electrons and holes, but the quantum efficiency of photo generated electrons and holes is low because of the high recombination rate. Therefore, the approaches that enhancing the absorption efficiency of catalysts to visible light and improving quantum efficiency of catalysts are very important in the application of TiO2 catalysts.In this experiment, the new catalyst was prepared with two methods:calcinatory and hydrothermal method, hydrothermal method. We used glucose as carbon source, ammonium paramolybdate as molybdenum source, anatase TiO2 and titanium tetrachloride as titanium source, respectively. The physical-chemical properties of the catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV-Vis diffuse reflectance spectroscopy (DRS), specific surface area (BET). The results indicate that molybdenum ions substitute parts of Ti4+ in the lattice of TiO2. Most carbon species are modified on the surface of TiO2 and others exist as an interstitial dopant. The photocatalytic activity was evaluated by the photocatalytic degradation of Rhodamine B (RhB) dye under visible light. The results show that the codoped photocatalyst compared with monodoped TiO2 catalyst and pure TiO2 catalyst have higher photocatalytic activity.