Acid-Stable Magnetic Core–Shell Nanoparticles for the Separation of Rare Earths
摘要：
Core–shell Fe3O4@SiO2 nanoparticles were prepared with a modified Stber method and functionalized with N-[(3-trimethoxysilyl)propyl]ethylenediamine triacetic acid (TMS-EDTA). The synthesis was optimized to make core–shell nanoparticles with homogeneous and thin SiO2 shells (4.8 ± 0.5 nm) around highly superparamagnetic Fe3O4 cores (14.5 ± 3.0 nm). The core–shell Fe3O4@SiO2(TMS-EDTA) nanoparticles were then used for the extraction and separation of rare-earth ions. By comparing them with previously published results for Fe3O4(TMS-EDTA) and SiO2(TMS-EDTA) nanoparticles, it was clear that the core–shell nanoparticles combine the advantage of magnetic retrieval observed for Fe3O4(TMS-EDTA) nanoparticles with the higher selectivity observed for SiO2(TMS-EDTA). The advantages of the SiO2 shell include a lower specific weight and a larger grafting density compared to Fe3O4 surfaces, but also the improved resistance to acidic environments required for the stripping of rare-earth ions.
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DOI：
10.1021/ie502546c
被引量：
年份：
2014
ACS
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lirias.kuleuven.be
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core.ac.uk
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solvomet.eu
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kuleuven.rare3.eu
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kuleuven.rare3.eu
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