▎ 摘　　要

In this work, thermally exfoliated graphene nanosheets (GNS) were employed to prepare novel Ag3PO4-GNS composite photocatalysts by a facile chemical precipitation approach. The asprepared Ag3PO4-GNS composite photocatalysts were characterized by X-ray diffraction (XRD) pattern, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Raman spectroscopy, thermogravimetric (TG) analysis, ultraviolet-visible diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectra. It was found that the Ag3PO4 particles were well deposited on the surfaces of GNS. Compared with bare Ag3PO4 and Ag3PO4-rGO composite, the Ag3PO4-GNS composite exhibited enhanced photocatalytic activity for the photodegradation of rhodamine B (RhB) under visible light irradiation. The photocatalytic degradation rate of Ag3PO4-GNS composite was 1.7 times that of bare Ag3PO4 and about 1.3 times that of Ag3PO4-rGO for the degradation of RhB. Furthermore, the photocatalytic stability of Ag3PO4-GNS composite was also greatly enhanced. This enhanced photocatalytic activity and stability could be ascribed to the positive synergetic effects between the Ag3PO4 particles and GNS sheets, which could provide a greater number of active adsorption sites, suppress charge recombination and reduce the serious photocorrosion of Ag3PO4. Moreover, the photocatalytic degradation of RhB over Ag3PO4-GNS composites was also optimized, suggesting that the optimal amount of GNS in the composites was 11.4 wt.%. This work shows a great potential of Ag3PO4-GNS composite for environmental treatment of organic pollutants.