Synthesis and Characterization of MnFe_2O_4 with Different Morphologies and Their Application in Water Treatment

Manganese ferrite(MnFe2O4) with rough surface was synthesized by a simple solvothermal method.The average diameter of particles was about 150 nm,and the tubes of rough surface about 10 nm.Here,magnetic MnFe2O4 particles with different morphologies(cube,polyhedron and octahedron) were successfully prepared by controlling CTAB concentration.Both of the samples with different morphologies exhibit ferromagnetic behavior at room temperature.The saturation magnetization(Ms) and coercivity(Hc) of MnFe2O4 with non-smooth surface are 58.7 Am2/kg and 6.23 kA/m,respectively.The particles with rough surface also show good performance in removal of pollutants like Congo red(92.4 mg/g),CrVI(54.4 mg/g),and PbII(84.4 mg/g) from waste water by adsorption experiments.Because the particles are recollected by magnetic separation,the waste water purification rate can be improved,which expands the applications of magnetic materials.