Citation: XUE Juan-Qin, XU Shang-Yuan, ZHU Qian-Wen, QIANG Liang-Sheng, MA Jing. Preparation and Adsorption Properties of Amino Modified Magnetic Mesoporous Microsphere Fe₃O₄@SiO₂@mSiO₂[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(9): 1503-1511. doi: 10.11862/CJIC.2016.215 shu

Preparation and Adsorption Properties of Amino Modified Magnetic Mesoporous Microsphere Fe₃O₄@SiO₂@mSiO₂

1.
Department of Chemical Engineering, Xian University of Architecture and Technology, Xi′an 710055, China
2.
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China

Corresponding author: XUE Juan-Qin, huagong1985@163.com MA Jing, majing@xauat.edu.cn
Received Date: 10 May 2016
Revised Date: 7 August 2016

Figures(9)

The SiO₂ encapsulated Fe₃O₄ composite magnetic microsphere was synthesized by a modified Stöber method with Fe₃O₄ nanoparticles as cores. The structures and properties of the composite were characterized by XRD, SEM, TEM, N₂ absorption-desorption, FTIR and VSM. The results showed that the as-prepared magnetic microspheres exhibited a spherical shape and uniform particle size distribution. This material possessed a BET surface area of 413 m²·g^-1 and saturation magnetization of 68.93 emu·g^-1, respectively. The particle morphology became more uniform with the increase of TEOS volumes when silica shell became thicker. The saturation magnetization of the nanocomposite particles decrease with the thickness of the silica shell increasing, the coercive force of particles was almost unchanged, and remained favorable to superparamagnetism. Based on the composite magnetic microsphere, the new magnetic nano-adsorbent Fe₃O₄@SiO₂@mSiO₂-NH₂ was fabricated by coating silica from a covalent binding of amino(-NH₂) onto the surface of Fe₃O₄@SiO₂@mSiO₂ microsphere. And the adsorption properties of the adsorbent for Cr(Ⅵ) ions were investigated. The study on kinetics of Cr(Ⅵ) showed that the adsorption reaction could be considered as the pseudo-second-order kinetic model. The adsorption capability was significantly affected by the distributions of Cr(Ⅵ) species and -NH₂. The adsorption mechanisms of Cr(Ⅵ) including both ion exchange and electrostatic gravitation were also discussed.
- core-shell structure,
- composite magnetic microsphere,
- mesoporous silica,
- absorption property
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沈阳化工大学材料科学与工程学院沈阳 110142

Preparation and Adsorption Properties of Amino Modified Magnetic Mesoporous Microsphere Fe3O4@SiO2@mSiO2

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Preparation and Adsorption Properties of Amino Modified Magnetic Mesoporous Microsphere Fe₃O₄@SiO₂@mSiO₂