▎ 摘　　要

A magnetic CoFe2O4-graphene nanocomposite was prepared via a facile one-pot hydrothermal method and characterized by X-ray powder diffraction (XRD), diffuse reflectance UV-vis spectroscopy (DRS), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and vibrating sample magnetometry (VSM) techniques. The CoFe2O4 nanoparticles were found to have a size of ca. 15 nm and were spread out on the graphene sheet. Magnetic studies revealed that the CoFe2O4-graphene nanocomposites can be easily separated from the solution by an external magnetic field. The photocatalytic degradation of methylene blue dye (MB) was evaluated under visible irradiation. The photocatalytic activity was found to be affected by the structural and optical properties as well as the surface area of the samples. Compared with pure CoFe2O4, the CoFe2O4-graphene nanocompositeexhibited improved photodegradation performance. The synthesized CoFe2O4-graphene nanocomposite can be potentially used as a visible-light responsive magnetically separablephotocatalyst and hence as a powerful separation tool to deal with water pollution problems.