Preparation and properties of Bi2WO6-RGO composite photo-catalysts
Bi2WO6-RGO photocatalyst was prepared by solvothermal method in the mixed solvents of N,N-dimethylformamide and ethylene glycol.The structure,physical and chemical properties of pure Bi2WO6and Bi2WO6-RGO composite catalysts were characterized by XRD,SEM,TEM,EDS and DRS.The results showed that Bi2WO6-RGO was successfully composited with grapheme.UV-vis spectra showed that Bi2WO6-RGO photocatalysts had strong adsorption in the visible light region. The rhodamine B(RhB)pollutant was degraded by Bi2WO6or Bi2WO6-RGO catalysts under visible light.The results confirmed that Bi2WO6-RGO exhibited better photocatalytic activity than pure Bi2WO6,which was attributed to accelerated separation of photo electron from holes in the composite catalyst.At the same time(40 min)and light conditions,the degradation rate of pollutant(RhB)by Bi2WO6-RGO(0.6%)was high up to 84.0%,while its degradation rate by the pure Bi2WO6was only 67.2%.
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