Abstract
The monoclinic-WO3 and Fe-doped WO3 powders were successfully obtained at 800 °C synthesized via sol-gel approach using fresh egg albumen as one solvent to provide a matrix for entrapment of W(VI) ions to acquire gel form. The obtained nano-particles were characterized via powder x-ray diffractometry (XRD), x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), brunauer-emmett teller (BET), uv–vis spectroscopy (UV), photoluminescence spectroscopy (PL) and fourier transform infrared spectroscopy (FTIR). The efficiencies of catalysts for de-colorization of organic pollutants were investigated on methylene blue (MB) dye. The results reveal that 5% Fe-doped WO3 photo-catalyst shows best photocatalytic performance under visible light irradiation (~95% in 120 min) with a rate constant(~0.0227 min−1). The enhanced photocatalytic activity of 5% Fe-doped WO3 is due to its high crystallinity, large BET surface area (~30.26 m2/g), nano-porous architecture (pore diameter ~ 1.76 nm), low PL emission intensity, visible light absorbing band gap (~2.39 eV), high rate of electron-hole pairs generation and suppressed recombination of photo-generated charges.
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