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首页> 外文期刊>Chemistry: A European journal >Superparamagnetic Composites Based on Ionic Resin Beads/CaCO3/Magnetite
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Superparamagnetic Composites Based on Ionic Resin Beads/CaCO3/Magnetite

机译：基于离子树脂珠/ CaCO3 /磁铁矿的超顺磁性复合材料

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摘要

The preparation of superparamagnetic composites obtained by CaCO3 mineralization from supersaturate aqueous solutions is presented. The preparation was conducted in the presence of oleic acid stabilized magnetite nanoparticles as a water-based magnetic fluid and insoluble templates as gel-like cross-linked polymeric beads. The presence of the magnetic particles in the composites provides a facile way for external manipulation using a permanent magnet, thus allowing the separation and extraction of magnetically modified materials. Two ion exchangers based on divinylbenzene/ethyl acrylate/acrylonitrile cross-linked copolymer-a cation ion exchanger (CIE) and an amphoteric ion exchanger (AIE)-were used, as well as different addition orders of magnetite and CaCO3 crystals growth precursors. The morphology of the composites was investigated by SEM, the polymorphs content by X-ray diffraction, and the thermal stability by thermogravimetric analysis. Polymer, CaCO3, and magnetite in the composite particles were shown to be present by energy dispersive X-ray (EDX), XPS, and TEM. The sorption capacity for Cu-II ions was tested, as compared to samples prepared without magnetite.
机译：介绍了由CaCO3矿化过饱和水溶液制备超顺磁性复合材料的方法。该制备在油酸稳定的磁铁矿纳米颗粒作为水基磁性流体和不溶性模板作为凝胶状交联的聚合物珠粒的情况下进行。复合材料中磁性颗粒的存在为使用永久磁铁进行外部操作提供了一种简便的方法，从而可以分离和提取磁性改性材料。使用了两个基于二乙烯基苯/丙烯酸乙酯/丙烯腈交联共聚物的离子交换剂-阳离子交换剂（CIE）和两性离子交换剂（AIE）-以及磁铁矿和CaCO3晶体生长前体的不同添加顺序。通过SEM研究复合材料的形态，通过X射线衍射研究多晶型物含量，并且通过热重分析分析其热稳定性。通过能量色散X射线（EDX），XPS和TEM显示了复合颗粒中的聚合物，CaCO3和磁铁矿。与没有磁铁矿制备的样品相比，测试了Cu-II离子的吸附能力。

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