Abstract
The intrinsic peroxidase-like activity of magnetite (Fe3O4) has to be improved to activate H2O2 under mild conditions for practical applications. Herein fluorinated Fe3O4 microspheres (F-Fe3O4-r, r: 0.1–3), where r indicates the F/Fe molar ratio in the reaction mixture, were prepared by glycothermal synthesis and characterized by various complementary techniques. Fluoride ions were enriched on the surface of F-Fe3O4-1, and may substitute lattice oxygen or ion-exchange with surface hydroxyl groups. Kinetic study showed that the apparent activation energy for catalytic decomposition of H2O2 over F-Fe3O4-1 was significantly lower than those over unmodified Fe3O4 or other heterogeneous peroxidase-like catalysts (20.3 vs. 32.8–142 kJ mol−1), which improved the low-temperature activity of the former (decomposition rate of H2O2 at 25 °C: 0.0150 h−1). Potential applications of F-Fe3O4-1 in wastewater treatment were demonstrated by catalytic degradation of orange G with H2O2 at pH 6.8 and 25 °C.
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