▎ 摘　　要

We describe a simple, cost-effective, efficient, and high-yielding photocatalytic approach for the oxidative self-dimerization of 2-naphthols using a semiconductor-metal hybrid that consists of intercalated manganese dioxide nanoparticles in reduced graphene oxide (rGO/MnO2) under visible-light irradiation. The desired photocatalyst was synthesized in a single step by mixing MnO2 nanoparticles with rGO ultrasonically. The hybrid photocatalyst exhibited a significantly higher activity than neat MnO2 nanoparticles and rGO, which is believed to be because of the synergistic effect of its components. To our knowledge, this hybrid rGO/MnO2 nanocomposite is the first heterogeneous, green photocatalyst for the oxidative coupling of 2-naphthols under mild conditions.