▎ 摘　　要

Aiming to achieve enhanced catalytic activity and stability toward the reduction of nitroarenes and the oxidation of benzyl alcohols, was synthesized novel core-shell nanostructures of graphene wrapped Fe3O4@polydopamine (PDA)/Pd octahedral. Different graphene-based materials such as graphene oxide (GO), and nitrogen doped reduced graphene oxide (N-RGO) were used for wrapping Fe3O4@PDA/Pd core-shell octahedral nanostructures. The best results in the catalytic reactions were achieved by using Fe3O4@PDA/Pd@ N-RGO as the catalyst. Increased adsorption ability, augmented conductivity and additional active sites introduced by N-RGO make Fe3O4@PDA/Pd@N-RGO hybrid display improved catalytic activity. The catalyst could be recovered by an external magnetic field and reused for successive five runs without any significant deactivation.