Abstract
Magnetic Fe 3O 4 crystals were synthesized by a simple hydrothermal method using K 4Fe(CN) 6 as single precursor. The chemical compositions and morphologies of the as-prepared samples were characterized in detail by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS) and scanning electron microscopy (SEM). The experimental results show that the magnetic Fe 3O 4 particles are facilely prepared by the hydrothermal reaction of K 4Fe(CN) 6 and NaOH at 200 °C. Regular octahedral Fe 3O 4 crystals are obtained when Na 2S 2O 3 is added to the reaction system. The possible mechanism was discussed to elucidate the formation of the magnetic Fe 3O 4 crystals. Besides, the magnetic investigations show that the values of saturation magnetization and coercivity of octahedral Fe 3O 4 are about 87 emu/g and 184 Oe, respectively. Octahedral Fe 3O 4 also exhibits relatively good catalytic performance in the oxidation of styrene.
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