| 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) |
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| 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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