Magnetically Separable Fe3O4 Nanoparticles-Decorated Reduced Graphene Oxide Nanocomposite for Catalytic Wet Hydrogen Peroxide Oxidation

Fe₃O₄ nanoparticles-decorated reduced graphene oxide magnetic nanocomposites (Fe₃O₄/rGO NCs) were prepared by a facile one-step strategy, and further used as heterogeneous Fenton-like catalysts for catalytic wet hydrogen peroxide oxidation (CWHPO) of methylene blue (MB) at 25 °C and atmospheric pressure. The effects of variables such as the Fe₃O₄/rGO with the mass ratio of rGO, initial pH, MB concentration and H₂O₂ dosage were investigated. The Fe₃O₄/rGO NCs with rGO mass ratio of 10.0 wt % showed the highest H₂O₂-activating ability, which was six-fold than that of pure Fe₃O₄ nanoparticles (NPs). The resulting catalysts demonstrated high catalytic activity in a broad operation pH range from 5 to 9, and still retained 90.5 % catalytic activity after reuse in five cycles. Taking advantage of the combined benefits of rGO and magnetic Fe₃O₄ NPs, these Fe₃O₄/rGO NCs were confirmed as an efficient heterogeneous Fenton-like catalyst for CWHPO to treat organic pollutants. And a reasonable catalytic mechanism of Fe₃O₄/rGO NCs was proposed to interpret the degradation process.