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

摘要

Recently, heterogeneous photocatalysis is mainly applied to the photodegradation of environ-mental organic pollutants and has achieved satisfac-tory research progress. In this work, a series of high-performance heterojunction structure visible-light-driven(VLD)g-C3N4/Ag2WO./WO3 photocatalysts (GAW) with different mass content of g-CN4 were synthesized through a facile hydrothermal approach. The products were characterized by using X-ray dif-fraction (XRD), scanning electron microscopy (SEM). Raman spectra,FT-IR, UV-vis diffuse re-flectance spectroscopy (DRS),photoluminescence (PL)spectra and Brunauer-Emmett-Teller(BET) ni-trogen adsorption apparatus. The results indicated that the as-prepared Ag2WO/WO; particles were distributed on the surface of g-C3N4 and the intro-duction of g-CaN4 could narrow the band gap of Ag2WO4WO3. By using decontaminations of meth-yleneblue(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 Ag,WO4/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 or-ganic pollutants.