▎ 摘　　要

Novel visible light driven Ag-Bi2WO6-graphene nanocomposite photocatalysts were synthesized by hydrothermal method. The optimized photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultraviolet visible diffuse reflection spectroscopy (DRS). The photocatalysts exhibited a significantly enhanced photocatalytic performance compared with pure Bi2WO6 under simulated solar light. The optimal product, 5 mol% Ag-Bi2WO6-2.5 weight% graphene, showed the highest photocatalytic activity to degrade metoprolol. Metoprolol was 100% eliminated after 2 h simulated solar light irradiation in a solution with photocatalyst amount of 1 mg/mL, suggesting the potential application of this material in wastewater treatment. Eight reaction intermediate products were observed by LC-MS/MS and a tentative pathway of metoprolol degradation was proposed. (C) 2014 Elsevier B.V. All rights reserved.