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每周分享：acid-stable magnetic core–shell nanoparticles for the separation of rare earths

今天给大家分享的是2014年9月份 《ind. eng. chem. res》上发表的一篇名为：acid-stable magnetic core–shell nanoparticles for the separation of rare earths
文章摘要如下：
core–shell fe3o4@sio2 nanoparticles were prepared with a modified stöber 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.
该文章中材料表征采用的是美国麦克仪器3flex
详情可参考下面链接：
http://pubs.acs.org/doi/abs/10.1021/ie502546c