▎ 摘　　要

Three-dimensional reduced graphene oxide (3D-RGO) supported Pd catalysts were prepared via one-step self-assembly in a mild water bath with ascorbic acid as reducing agent. The as-synthesized catalyst exhibited 3D architectures of graphene with abundant mesopores and uniform pore size of 3.9 nm. Relatively uniform Pd nanoparticles with 20-25 nm diameters were also obtained by the simple method. Under suitable synthesis conditions, 3D-RGO supported Pd catalyst showed a much high catalytic activity along with an excellent stability in the hydrogenation of nitrobenzene. Importantly, a perfect recovery rate of over 95% from liquid system was obtained.