Synthesis of Carboxyl-functionalized Silica Coated Fe3O4 Magnetic Nanoparticles and Their Adsorption Ability of Cu2+

doi:10.3969/j.issn.0251-0790.2012.01.018

Abstract

Abstract: Carboxyl-functionalized Fe₃O₄ magnetic nanoparticles(CMNP) with core-shell structure were prepared by modifying silica coated Fe₃O₄ magentic nanoparticles(MNP), which were successfully prepared by co-precipitation method, with 3-aminopropyltriethoxysilane(APTES) and Succinic anhydride. The morphology, structure, chemical composition and magnetic characteristics of the CMNP were characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), X-ray energy dispersive spectroscopy(EDS), vibrating sample magnetometer(VSM), thermal gravimetric analysis(TGA) and Fourier-transformed infrared spectroscopy(FTIR). Moreover, the adsorption properties of the CMNP for the removal of Cu²⁺ in aqueous solution were investigated and various factors affecting the absorption behavior of Cu²⁺ such as initial pH value, initial concentration of Cu²⁺ and contact time were studied. The TEM results show that the average partical size of CMNP is 15 nm. Magnetic measurement reveals it is nearly superparamagnetic with a saturation magnetization of 41.84 A·m²/kg. Adsorption equilibrium was achieved rapidly in 10 min and adsorption data of CMNP fitted well with the Langmuir isotherm model with the maximum adsorption capacity of 43.48 mg/g, the maximum uptake of Cu²⁺ was recorded at pH=7.

Key words: Co-precipitation method, Fe₃O₄magentic nanoparticles, Cu²⁺, Adsorption

CLC Number:

O646.8

TrendMD:

ZHENG Qun-Xiong, LIU Huang, XU Xiao-Qiang, DU Mei-Xia. Synthesis of Carboxyl-functionalized Silica Coated Fe₃O₄ Magnetic Nanoparticles and Their Adsorption Ability of Cu²⁺[J]. Chem. J. Chinese Universities, 2012, 33(01): 107.

References

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Synthesis of Carboxyl-functionalized Silica Coated Fe₃O₄ Magnetic Nanoparticles and Their Adsorption Ability of Cu²⁺

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