Potential visible WO3/GO composite photocatalyst

Abstract

Graphene oxide (GO) was synthesized by Hummers method. GO and tungsten oxide (WO3) composites were successfully prepared by deposition of WO3 on GO surface to make efficient visible light catalyst. Scanning electron microscopy of pure GO revealed that GO films are folded with kinked and wrinkled edges. The interspaces layers are partially filled by WO3 nanoparticles with their less wrinkled edges and smooth surface of composite. Moreover, composite sheets are thin and transparent which allow easy penetration of light. EDS showed the presence of C, O, and W in GO/WO3 composites with no impurity. UV‐Vis diffused reflectance spectra showed red shift with the increase in WO3 contents. Raman spectra of GO and GO/WO3 composite show G and D bands. These bands reduced in intensity in composite sample due to removal of oxygenated functional groups with some new peaks of WO3. FT‐IR confirmed successful oxidation of graphite into GO with reduction in GO because oxide‐related bond groups decrease after reduction. The transmittance peaks of WO3 in composite sample are appeared indicating W‐O‐C linkages. The highest visible light activity of the composite is due to easy penetration of light with deposition of WO3, low band gap, and new linkages.

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