▎ 摘　　要

Gold nanoparticles were decorated onto sulfonated three-dimensional graphene (3DG-SO3H) through spontaneous chemical reduction of HAuCl4 by 3DG-SO3H. This nanocomposite exhibited excellent catalytic activity for the synthesis of symmetric biaryls via the Ullmann homocoupling of aryl iodides in an aqueous medium. Additionally, this nanocomposite was used as a catalyst for the reduction of p-nitrophenol to p-aminophenol. The catalyst could be used more than six times successively without significant deactivation.