Reduced graphene oxide–zinc sulfide (RGO–ZnS) nanocomposite: a new photocatalyst for oxidative cyclization of benzylamines to benzazoles under visible-light irradiation

Abstract

A simple route for the preparation of a reduced graphene oxide–zinc sulfide (RGO–ZnS) nanocomposite via one-pot hydrothermal synthesis has been reported. The chemical composition, morphology, and structure of the RGO–ZnS photocatalyst were fully characterized via standard analysis methods, and then, its photocatalytic applications were surveyed through the synthesis of benzazoles. It was found that the photocatalytic properties of pure ZnS were enhanced with the incorporation of RGO. Herein, we present the RGO–ZnS composite as a new photocatalyst for the synthesis of benzazoles through oxidative cyclization of benzylamines with 1,2-ortho-phenylene disubstituted compounds as a precursor under room temperature, visible light irradiation, and acid/oxidant-free conditions.