Superparamagnetic Composites Based on Ionic Resin Beads/CaCO3/Magnetite |
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| Authors: | Dr Ion Bunia Dr Vlad Socoliuc Dr Ladislau Vekas Dr Florica Doroftei Dr Cristian Varganici Dr Adina Coroaba Prof Bogdan C Simionescu Dr Marcela Mihai |
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| Affiliation: | 1. “Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Iasi, Romania;2. Romanian Academy—Timisoara Branch, Center for Fundamental and Advanced Technical Research, Laboratory of Magnetic Fluids, Timisoara, Romania;3. Department of Natural and Synthetic Polymers, “Gh. Asachi” Technical University of Iasi, Iasi, Romania |
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| Abstract: | 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 CuII ions was tested, as compared to samples prepared without magnetite. |
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| Keywords: | CaCO3 cation ion exchange magnetic fluids materials science superparamagnetic composites |
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