一锅共缩聚法制备氨基改性Fe3O4@SiO2及其Cr(Ⅵ)吸附性能增强
Preparation of Amino Modified Fe3O4@SiO2 Composite by One-Pot Co-condensation Method with Enhanced Adsorption Performance Towards Cr(Ⅵ)
作者单位E-mail
古蒙蒙 武汉理工大学化学化工与生命科学学院, 武汉 430070  
蔡卫权 武汉理工大学化学化工与生命科学学院, 武汉 430070
广州大学化学化工学院, 广州 510006 
cccaiwq@gzhu.edu.cn 
马甜 武汉理工大学化学化工与生命科学学院, 武汉 430070  
摘要: 采用一锅共缩聚法制备了不同N原子个数的硅烷偶联剂改性并且SiO2包覆的球形磁性Fe3O4@SiO2-xN(x=1,2,3)复合吸附剂,其中1N、2N、3N分别代表γ-氨丙基三甲氧基硅烷、γ-氨乙基氨丙基三甲氧基硅烷、二乙烯三胺基丙基三甲氧基硅烷。采用XRD、SEM、N2吸附-脱附、元素分析、FT-IR和ζ电位等手段对典型样品的物理化学性质进行了对比表征。结果表明,改性后的复合材料均具有良好的球形形貌和较高的等电点,其含N量呈现出Fe3O4@SiO2-1N < Fe3O4@SiO2-2N < Fe3O4@SiO2-3N的趋势。对Cr(Ⅵ)的静态吸附实验表明,其最大吸附量随着N含量的增加而降低,即Fe3O4@SiO2-1N(79.74 mg·g-1) > Fe3O4@SiO2-2N(63.05 mg·g-1) > Fe3O4@SiO2-3N(55.37 mg·g-1),并对其呈现这种趋势的机理进行了分析。对模拟废水的吸附实验表明,样品Fe3O4@SiO2-1N可以同时吸附废水中的多种重金属离子,并且可以在30 s内实现磁性分离。
关键词: 一锅共缩聚法  氨基改性  吸附性能  六价铬  磁分离
基金项目: 国家自然科学基金(No.21476179)、2016年武汉市黄鹤英才(科技)计划和广州大学百人计划(No.69-18ZX10016)资助项目。
Abstract: 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.
Keywords: one-pot co-condensation  amino modification  adsorption performance  hexavalent chromium  magnetic separation
投稿时间:2018-01-29 修订日期:2018-04-17
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古蒙蒙,蔡卫权,马甜.一锅共缩聚法制备氨基改性Fe3O4@SiO2及其Cr(Ⅵ)吸附性能增强[J].无机化学学报,2018,34(7):1293-1302.
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