Synthesis Of RGO/Ag₂O/Fe₃O₄ Ternal Composites And Photocatalytic Research

Photocatalytic technology is a low-cost, high-efficiency green technologie of the future, utilizing solar energy for chemical reaction. However, subject to the narrow band gap, low photocatalytic efficiency and difficult of recycling, the photocatalytic material is not large-scale industrial applications. In this paper, we developed a RGO/Ag2O/Fe3O4 nano composite to solve the visible light response and magnetic recycling problems.The stable cubic、octahedral and polyhedron photocatalyst Ag2O was successfully fabricated by ion exchangen method-different ammonium solution forming silver ammonia solution followed by the dropping of sodium hydroxide. The obtained nano materials were characterized by XRD、SEM and UV-vis, the results show the good crystallinity and purity of them. The cubic Ag2O showed the best photocatalytic activity and good catalytic stability towards the target pollutant methyl orange, the degradation of methyl orange could be 95% in 70min.The stability of the Ag-Ag2O self-stabilizing system was also investigated in detail.Superparamagnetic nano Fe3O4 was prepared via a hydrothermal method. Mercapto group were attached to magnetic core with the treatment of MPTS and silver nanoparticles situ grew on the surface of Fe3O4. A hydrothermal synthesis was carried out for RGO/Ag、 RGO/Ag2O and RGO/Fe3O4 composites. The result of XRD、TEM、SEM、XPS and VSM reveal that GO could be reduced by alcohol solvent at some temperature and nanoparticles distributed homogeneously on the surface of RGO.The RGO/Ag2O/Fe3O4 ternary composites was prepared through a two-step hydrothermal method with the graphene oxide. The morphology and structure of composite was characterized by XRD、SEM、TEM、Rama、VSM and AFM. The Ag2O and Fe3O4 were successfully supported on the surface of RGO sheet. The saturation magnetization of RGO/Ag2O/Fe3O4 ternary composite was 39.2 emu·g-1, so that it could be separated rapidly in·· magnetic field. Owning to the high specific surface area and excellent charge transfer ability of graphene, compared with Ag2O, the ternary composites exhibit better adsorption capacity and higher catalytic efficiency.