Abstract
With manganese substituted heteropoly tungstate β2-K6[SiW11Mn(H2O)O39]·xH2O as the active component, a composite photocatalyst β2-SiW11Mn/TiO2 was prepared by impregnation method. The composite catalyst was characterized by FT-IR, UV-Vis, XRD, SEM and X-ray photoelectron spectroscopy. The catalytic activity was evaluated by the degradation of malachite green solution. The results showed that the degradation of malachite green under ultraviolet light reached 92.7% and the degradation effect under sunlight is better than that under ultraviolet light, reaching 97.2%. This indicates that polyoxometalates and titanium dioxide produced a synergistic effect to make the light response range expanded and reduced the reaction requirements. The catalytic degradation performance of pure titanium dioxide, heteropoly acid salt β2-SiW11Mn and the prepared catalyst β2-SiW11Mn/TiO2 on malachite green were studied. The results showed that the composite photocatalyst exhibited the best photocatalytic activity, confirming the significance of the material being compounded. Finally, the kinetics of the reaction were studied, and the reaction is a first-order reaction.
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