Synthesis of TiO2-V2O5 composites for photocatalytic degradation of methylene blue under visible light irradiation
Abstract
The nanocomposites photocatalyst of TiO2-V2O5 was prepared by heating method at various temperatures as 400 oC; 425 oC; 450 oC; 500 oC; 550 oC in an hour. The V2O5 doped TiO2 with variation of vanadium mass percentage (4,9% ; 7,3%; 9,7%; 12,2% and 14,6%). The experimental results indicated that the annealing temperature and vanadium mass percentage were important factors for the morphology of samples which influenced the number of efficient TiO2-V2O5 nano-heterostructures. The phase structures of TiO2-V2O5 catalysts with different loading rates were characterized by Scanning electron microscope (SEM), X-Ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectra, diffuse reflection spectroscopy UV-Vis, Transmission Electron Microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDX) and Nitrogen isothermal adsorption (Brunauer-Emmett-Teller-BET). The combination of vanadium oxide with TiO2 could help to decrease the recombination rate of excited electrons/holes. The photocatalytic activity was evaluated by degradation of methylene blue (20 mg/l) in solution with the yield more than 90% after 2 hours under visible light irradiation.
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