Solvothermal synthesis of graphene/BiOCl0.75Br0.25 microspheres with excellent visible-light photocatalytic activity

摘要

Three-dimensional BiOCl0.75Br0.25/graphene (BG) microspheres have been synthesized via a facile solvothermal route. The as-prepared samples were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray Photoelectron Spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (UV-vis DRS) and Brunauer-Emmett-Teller (BET) area. The photocatalytic activities of the samples were evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation. It was shown that the BG photocatalysts with 5.0 wt% graphene (BG5.0) exhibited the highest photocatalytic activity, which was almost up to 2.3 times than that of pure BiOCl0.75Br0.25. The enhanced photoactivity of BG5.0 was mainly attributed to the effective light absorption, the larger specific surface areas and the more efficient charge transportation and separation.