Citation: GU Meng-Meng, CAI Wei-Quan, MA Tian. Preparation of Amino Modified Fe₃O₄@SiO₂ Composite by One-Pot Co-condensation Method with Enhanced Adsorption Performance Towards Cr(Ⅵ)[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(7): 1293-1302. doi: 10.11862/CJIC.2018.161 shu

Preparation of Amino Modified Fe₃O₄@SiO₂ Composite by One-Pot Co-condensation Method with Enhanced Adsorption Performance Towards Cr(Ⅵ)

GU Meng-Meng ¹ ,
CAI Wei-Quan ^1,2,, ,
MA Tian ¹

1.
School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China
2.
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China

Corresponding author: CAI Wei-Quan, cccaiwq@gzhu.edu.cn
Received Date: 29 January 2018
Revised Date: 17 April 2018

Figures(9)

A one-pot co-condensation method was used to prepare three kinds of silane coupling agents containing different amounts of N atom modified and SiO₂ coated magnetic adsorbents Fe₃O₄@SiO₂-xN (x=1, 2, 3). Here, 1N, 2N, and 3N represent 3-aminopropyltrimethoxysilane, N-β(aminoethyl)-γ-aminopropyltrimethoxysilane and 2-[2-(3-Trimethoxysilylpropylamino)ethylamino]ethylamine, respectively. Their physicochemical properties were comparatively characterized by XRD, SEM, N₂ adsorption-desorption, elemental analysis, FT-IR and ζ potential. The results showed that the modified composites present good spherical morphologies and higher isoelectric points, and their nitrogen contents show the trend of Fe₃O₄@SiO₂-1N < Fe₃O₄@SiO₂-2N < Fe₃O₄@SiO₂-3N. The static adsorption experiments towards Cr(Ⅵ) showed that the corresponding maximum adsorption capacity decreases with increasing nitrogen content, namely Fe₃O₄@SiO₂-1N (79.74 mg·g^-1) > Fe₃O₄@SiO₂-2N (63.05 mg·g^-1) > Fe₃O₄@SiO₂-3N (55.37 mg ·g^-1), and the mechanism on this trend was also analyzed. The adsorption experiments on simulated wastewater showed that the Fe₃O₄@SiO₂-1N can adsorb some kinds of heavy metal ions simultaneously, and can achieve magnetic separation within 30 s.
- one-pot co-condensation,
- amino modification,
- adsorption performance,
- hexavalent chromium,
- magnetic separation
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Preparation of Amino Modified Fe₃O₄@SiO₂ Composite by One-Pot Co-condensation Method with Enhanced Adsorption Performance Towards Cr(Ⅵ)