Magnetically separable graphene-based Ni–Fe mixed metal oxide nanocubes derived from a Prussian- blue analogue: synthesis, structure and application in oxidative degradation of bisphenol A

Abstract

Mixed metal oxide (MMO) nanocubes were prepared by calcining a Ni–Fe Prussian-blue analogue (Ni–Fe PBA) and then uniformly supported on reduced graphene oxide (RGO) through a simple hydrothermal reaction instead of the commonly used etching. The structural characterization showed that the obtained Ni–Fe MMO/RGO has a larger specific surface area than those prepared by etching. Moreover, Ni–Fe MMO/RGO exhibited better catalytic performance in advanced oxidation. 95% of bisphenol A can be removed within 20 min, which is faster and needs less persulfate than the degradation catalyzed by the recently reported MMO catalysts derived from PBA. In addition, Ni–Fe MMO/RGO is magnetically separable, which shows great potential for practical applications.