Acid-Stable Magnetic Core鈥揝hell Nanoparticles for the Separation of Rare Earths

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• 作者：David Dupont ; Jakob Luyten ; Maarten Bloemen ; Thierry Verbiest ; Koen Binnemans
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：October 1, 2014
• 年：2014
• 卷：53
• 期：39
• 页码：15222-15229
• 全文大小：347K
• ISSN：1520-5045

文摘

Core鈥搒hell Fe₃O₄@SiO₂ nanoparticles were prepared with a modified St枚ber method and functionalized with N-[(3-trimethoxysilyl)propyl]ethylenediamine triacetic acid (TMS-EDTA). The synthesis was optimized to make core鈥搒hell nanoparticles with homogeneous and thin SiO₂ shells (4.8 卤 0.5 nm) around highly superparamagnetic Fe₃O₄ cores (14.5 卤 3.0 nm). The core鈥搒hell 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鈥搒hell 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.