▎ 摘　　要

An efficient approach was developed to deposit trimetallic nanoparticles (Au-Pd-Fe3O4) with diameter of about 10 nm on graphene. The composites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results indicate that the nanoparticles are homogeneously dispersed on the surface of graphene. As compared with the bimetallic counterparts (Pd-Fe3O4/rGO, Au-Fe3O4/rGO), Au-Pd-Fe3O4/rGO retains highest enzyme mimicking activity. The as-obtained composites becomes efficient and recyclable catalyst for liquid-phase reaction owing to their stability and magnetic separation. (C) 2016 Published by Elsevier B.V.