Synthesis and visible-light photocatalytic activity of WO3/g-C3N4 composite photocatalysts
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Abstract:
The WO3/g-C3N4 composite visible photocatalysts were successfully synthesized by an ultrasound-microwave-protonation process using HCl solution as solvent. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and Brunauer-Emmett-Teller (BET) specific surface area and photogradation of Rhodamine B (RhB) for visible-light properties. This results show that the composite catalysts are composed of WO3 nanosheets loading on g-C3N4 nanoplates. When the mass fraction of WO3 is 40%, the sample prepared by heating the precursor at 500℃ for 2 h has better photocatalytic activity than that prepared by pure WO3 and g-C3N4. The WO3/g-C3N4 can photodegradate 98% 100 mL RhB solution with concentration of 10-5 mol/L after 5 h visible-light (wavelength is larger than 420 nm) irradiation.
