Abstract
First-row transition-metal hybrid oxide nanoparticles (CoFe2O4, NiFe2O4, ZnFe2O4, CuFe2O4 and Fe3O4) were fabricated by co-precipitation. The obtained nanomaterials were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The UV-Fenton-like catalytic reactivity of those metal oxide nanoparticles was assessed via the removal of Rhodamine B (RhB) at a concentration of 20 ppm from an aqueous solution. In general, in a strong acidic environment, iron-hybrid transition-metal oxides (MFe2O4) as UV-Fenton-like catalysts showed higher catalytic activity than magnetite (Fe3O4) as they could generate more OH• radicals by increasing Fe3+/Fe2+ catalytic cycles and photocatalysis as well. In addition, ferrites were easily separated by an external magnet and thus reused for further cycles preserving their catalyst activities. This result highlighted the efficient utilization of iron-hybrid oxides as UV-Fenton-like catalysts for the RhB removal from an aqueous solution.
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