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Superparamagnetic Composites Based on Ionic Resin Beads/CaCO 3 /Magnetite
Author(s) -
Bunia Ion,
Socoliuc Vlad,
Vekas Ladislau,
Doroftei Florica,
Varganici Cristian,
Coroaba Adina,
Simionescu Bogdan C.,
Mihai Marcela
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201603779
Subject(s) - superparamagnetism , magnetite , materials science , composite material , ionic bonding , magnetite nanoparticles , chemical engineering , magnetic nanoparticles , nanoparticle , nanotechnology , chemistry , ion , magnetic field , magnetization , metallurgy , organic chemistry , quantum mechanics , engineering , physics
The preparation of superparamagnetic composites obtained by CaCO 3 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 CaCO 3 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, CaCO 3 , 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.