Preparation and application of a high efficient composite photocatalyst of visible light activity

Key words:  photocatalyst  visible-light-driven  Fe-Sm codoping  ACF  methyl orange  RO condensed water

Abstract:

The samarium ions and iron ions were used to codope the modified titanium dioxide, and ACF was used as the carrier with enormous surface area. The photocatalytic activity was evaluated by studying decomposition of the methyl orange (MO) solution under different light source. A high efficient composite photocatalyst was prepared by the sol-gel method and characterized by various techniques including X-ray powder diffraction (XRD), scanning electron microscopy (SEM), BET. The results show that the new composite photocatalysts have higher photocatalytic activity than Fe/TiO₂/ACF、Sm/TiO₂/ACF、TiO₂/ACF and original ACF. When n(Fe)∶n(Sm)∶n(Ti)=0.05∶0.1∶1, the loading of the TiO₂ is 45％ and the calcination temperature is 500 ℃, the new photocatalyst has the highest photocatalytic activity. Photocatalyst also can degrade high concentration methyl orange solution and can remain high activity by reusing it for seven times. Through the degradation of the RO condensed water, the removal rate can reach 37.12％.