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Efficient Fenton Oxidation of Congo Red Dye by Magnetic MgFe2O4 Nanorods.

We reported a highly active magnetic MgFe2O4 nanorods catalyst by annealing Mg(OH)2 deposited α-FeOOH nanorods. The catalyst was fully characterized by X-ray diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM), and Vibrating Sample Magnetometer (VSM), and the results showed that the magnetic MgFe2O4 nanorods were a diameter of 50 nm. The as-prepared MgFe2O4 nanorods were used to catalyze Fenton oxidation of Congo red (CR) solution, and the degradation rate of CR reached 95% after 2 h. The catalytic activity remained high after five cycles. The magnetic MgFe2O4 nanorods could be easily separated from organic solvent. The effects of parameters such as temperature, dosage of catalyst, and H2O2 were also analyzed. This opens new perspectives for the synthesis of one-dimensional magnetic catalyst based on a template method and effective treatment of aqueous hazardous dye.