Tio < Sub > 2 < / Sub > - Mmt Composite Photocatalyst Preparation And Research Of Photocatalytic Degradation Of Methyl Orange

In recent years, TiO2photocatalysts which are with efficient photocatalytic activity and strong oxidation ability are widely used as catalysts for photocatalytic oxidation technology. TiO2photocatalysts had been attached general concern by researchers in the water treatment research. However, there are such problems as low visible light utilization and low quantum efficiency; catalyst loss and difficult recovery in TiO2’s use limit the application. For these problems in the photocatalysis application areas, this paper loaded TiO2on montmorillonite, obtained a series of TiO2compound photocatalysts, which is with high activity and good stability, further prepared Fe doped TiO2Photocatalyst pillared montmorillonite and explored their photo-catalytic. Then we conducted degeneration experiment of methyl orange simulation.In this research TiO2pillared montmorillonite photocatalyst were prepared by sol-gel method using tetrabutyl titanate as precursor, montmorillonite as matrix. Investigated the effect of different factors such as the ratio of Ti to clay, pH, solvent, calcination temperature to the formation of TiO2pillared montmorillonite, studies indicated that TiO2pillared montmorillonite had highest catalytic activity when Ti to clay ratio is15mmol/g, pH is1.8, solvent of the alcohol is18mL. The crystal type, particle morphology, specific surface area and structural change of the TiO2pillared montmorillonite had been performed by the XRD、FT-IR、SEM、BET、TG-DTA to characterize the structure, morphology and composition of catalyst. It can be concluded that this kind of TiO2is anatase whtich has high photocatalytic activity after calcined at500℃.Fe doped TiO2pillared montmorillonite photocatalyst were preparaed, the crystal type, morphology and pore size of photocatalysts were analyzed by XRD, SEM and BET. The results show that the TiO2pillared montmorillonite with0.1%Fe has best photocatalytic activity and the catalyst TiO2presented anatase and rutile "mixed phase" structure. We can see a more complete set of layer structure and the sample is dispersion good. The aperture analysis shows that the catalyst belongs to mesoporous materials. The photocatalytic experiments had been performed at room temperature in a homemade photocatalytic reactor, With the continuous bubbles forms into oxygen, and further optical catalyst degradation processes had been optimized. The influence of different reaction conditions of the wastewater into the water ph, the initial concentration of the wastewater, the catalyst to add was investigated and the structural change of methyl orange in the process of photocatalytic degradation to studied. The results showed that:the value of pH significant impacts on the rate of removal of methyl orange, and methyl orange is easier degraded under the acidic condition than the alkalinity condition. It also found that the degradation rate decreased along with the initial concentration. However, the degradation rate first increases and then decreases with the catalyst increasing dosage. As the reaction proceeded, the characteristic peak intensity of azo bond in methyl orange structure becomes weak.It was observed that the catalysts in this study had a highly effective catalytic activity and strong stability, and reusability after studying the repetitive testing of catalysts.