Synthesis and Characterization of MnFe2O4 with Different Morphologies and Their Application in Water Treatment

doi:10.3724/SP.J.1077.2014.13519

Abstract

Abstract:

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 (M_s) and coercivity (H_c) 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), Cr^VI(54.4 mg/g), and Pb^II(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.

Key words: magnetic materials, crystal growth, microstructure, water treatment

CLC Number:

O614

DUAN Lian-Feng, ZHANG Yu, WANG Li-Min, JIN Song-Zhe, WU Hua. Synthesis and Characterization of MnFe₂O₄ with Different Morphologies and Their Application in Water Treatment[J]. Journal of Inorganic Materials, 2014, 29(7): 763-768.

Figures/Tables 6

Fig. 1 FESEM (a), TEM (b), HRTEM images and SEAD pattern (c) and XRD pattern (d) of sample S2

Fig. 2 Higher magnification FESEM images of samples S1, S3 and S4 (a) S1, 0 g; (b) S3,1 g; (c) S4, 2 g

Fig. 3 XRD patterns of samples S1, S3 and S4

Fig. 4 Hysteresis loops of the magnetite with special morphologies tested at room temperature

Table 1 Magnetism parameters of different samples

Samples	S2	S3	S4
M_s /(Am²·kg^-1)	58.7	76.7	61.3
M_{r /}(Am²·kg^-1)	6.5	1.3	7.4
H_c /(kA·m^-1)	6.23	0.95	6.87

Fig. 5 Adsorption capacity of samples S2, S3 and S4 adsorbed CR, Cr6+ and Pb2+ solution (a, c and e) and adsorption capacity of sample S2 adsorbed CR, Cr6+ and Pb2+solution (b, d and f) with different concentrations

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Synthesis and Characterization of MnFe₂O₄ with Different Morphologies and Their Application in Water Treatment

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