▎ 摘　　要

The present work deals with the development of a new ternary composite, Ag2Se-G-TiO2, using ultrasonic techniques as well as X-ray diffraction (XRD), scanning electron microscopy (SEM), high transmission electron microscopy (HTEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and UV-Vis diffuse reflectance spectra (DRS) analyses. The photocatalytic potential of nanocomposites is examined for CO2 reduction to methanol under ultraviolet (UV) and visible light irradiation. Ag2Se-TiO2 with an optimum loading graphene of 10wt% exhibited the maximum photoactivity, obtaining a total CH3OH yield of 3.52 mu mol g(-1) h(-1) after 48 h. This outstanding photoreduction activity is due to the positive synergistic relation between Ag2Se and graphene components in our heterogeneous system.