Abstract
Mo-doped WO3/TiO2 nanocomposites were synthesized via sol-gel method followed by a hydrothermal approach. It was demonstrated that doping of Mo and subsequent coupling with WO3 had a significant effect on the visible light sensitization of the TiO2 nanoparticles. WO3/TiO2-Mo composite photocatalyst was found to be very effective for the degradation of Methylene Blue dye and p-chlorophenol under visible light irradiation. The synthesized photocatalysts were fully characterized by XRD, FTIR, TEM and EDS. The oxidation state of the metal ions was confirmed by cyclic voltammetry analysis. Electrochemical Impedance Spectroscopy and Photoluminescence studies infers that the WO3/TiO2-Mo nanocomposite exhibits enhanced charge transfer and reduced charge recombination which subsequently improve the quantum yield for the degradation reaction. Double charge transfer mechanism was proposed for the superior photocatalytic performance of WO3/TiO2-Mo. Meanwhile, the composite catalyst did not show any significant decrease in the photocatalytic efficiency after 5 cyclic runs guaranteeing the high photo-stability of the photocatalysts.
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