▎ 摘　　要

The synthesis of efficient and recyclable noble metal nanocatalysts has always been a hot research area in nanocatalysis. In this work, novel porous sulfonated polystyrene (SPS)/reduced graphene oxide (rGO) composite microspheres loaded with Au nanoparticles (AuNP@SPS/rGO) were synthesized through gamma-ray radiation on a simple one-pot system, i.e. an aqueous solution containing cagelike porous SPS microspheres, GO, and HAuCl4. rGO and AuNPs with a size of about 12 nm were formed in water simultaneously under g-ray radiation, and in situ loaded on cagelike porous SPS microspheres. The prepared cagelike AuNP@SPS/rGO microspheres showed far better catalytic performance than conventional non-supported AuNP catalysts, which completed the reduction of o-nitroaniline by NaBH4 within only 15 s. Furthermore, the prepared cagelike AuNP@SPS/rGO microspheres can be easily recycled from the reaction system by centrifugation with no loss of the catalytic activity. This work indicates that porous polymer/rGO composite microspheres can be used as a promising support to prepare recyclable metallic nanocatalysts with ultra-high catalytic activity.