Magnetic Co3O4/reduced graphene oxide nanocomposite as a superior heterogeneous catalyst for one-pot oxidative esterification of aldehydes to methyl esters

Abstract

A magnetically separable hybrid material consisting of Co₃O₄ nanoparticles supported on reduced graphene oxide (Co₃O₄/rGO) was synthesized through a simple co-reduction process of graphene oxide (GO) and cobalt chloride (CoCl₂) using sodium borohydride (NaBH₄). The Co₃O₄/rGO heterogeneous catalyst exhibited a high-performance for the oxidative esterification of aldehydes to the corresponding methyl esters using tert-butyl hydroperoxide (TBHP) as an oxidant. Owing to the synergistic effect of rGO support, the hybrid catalyst exhibited superior catalytic activity to the corresponding cobalt oxide catalyst. Importantly, the synthesized hybrid possesses good magnetic properties, which enable facile recovery of the catalyst by using an external magnet.