SYSTHESIS OF SILVER-BASED COMPOSITE PHOTOCATALYSIS MATERIALS AND ITS VISIBLE-LIGHT-DRIVEN PHOTOCATALYTIC DEGRADATION OF DYE POLLUTANTS

Recently, heterogeneous photocatalysis is mainly applied to the photodegradation of environmental organic pollutants and has achieved satisfactory research progress. In this work, a series of high-performance heterojunction structure visible-light driven (VLD) g-C3N4/Ag2WO4/WO3 photocatalysts (GAW) with different mass content of g-C3N4 were synthesized through a facile hydrothermal approach. The products were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectra, FT-IR, UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectra and Brunauer-Emmett-Teller (BET) nitrogen adsorption apparatus. The results indicated that the as-prepared Ag2WO4/WO3 particles were distributed on the surface of g-C3N4 and the introduction of g-C3N4 could narrow the band gap of Ag2WO4/WO3. By using decontaminations of methylene-blue (MB) model reactions, the photocatalytic efficiencies of GAW photocatalysts were evaluated. The photocatalysts exhibited superior photocatalytic activity under visible light irradiation. The photo catalytic activities of all GAW photocatalysts were higher than that of the Ag2WO4/WO3 and about 98.68% MB was removed in 180 min. The possible mechanism of photocatalytic activity enhancement was proposed. The current work shows a design and synthesis of stable and high efficiency photocatalysts, applicable for the removal of the environmental organic pollutants.