Recent Advances in the Separation of Rare Earth Elements Using Mesoporous Hybrid Materials.
Recent Advances in the Separation of Rare Earth Elements Using Mesoporous Hybrid Materials.
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DOI：
10.1002/tcr.201800012
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发表时间：
2018-07
期刊：
影响因子：
--
通讯作者：
Kleitz F
中科院分区：
文献类型：
--
作者：
Hu Y;Florek J;Larivière D;Fontaine FG;Kleitz F
在过去的几十年里，对稀土元素（RE）的需求大幅增加，主要是因为这些元素在先进技术中被用作有价值的添加剂。然而，相邻稀土元素之间的离子半径差异很小，这使得有效的基于尺寸的分离极具挑战性。在不同类型的萃取方法中，固相萃取（SPE）是一种很有前途的候选方法，具有高富集因子，快速吸附动力学，减少溶剂消耗和最大限度地减少废物产生。开发用于该过程的高效和选择性吸附剂仍然是巨大的挑战。在这方面，有序的介孔材料（OSiO2）具有高的比表面积、可调的孔径、大的孔体积以及具有用于功能化的活性孔表面的稳定且互连的框架。这些特征满足了对增强型吸附剂的要求，不仅提供了能够容纳客体物种的巨大反应界面和大表面，而且还实现了用于富集和分离目的的离子特异性结合的可能性。这个简短的个人帐户总结了使用多孔杂化材料作为REE分离和纯化的选择性吸附剂的一些最新进展，特别关注有序介孔二氧化硅和碳基吸附剂。
Over the past decades, the need for rare earth elements (REEs) has increased substantially, mostly because these elements are used as valuable additives in advanced technologies. However, the difference in ionic radius between neighboring REEs is small, which renders an efficient sized‐based separation extremely challenging. Among different types of extraction methods, solid‐phase extraction (SPE) is a promising candidate, featuring high enrichment factor, rapid adsorption kinetics, reduced solvent consumption and minimized waste generation. The great challenge remains yet to develop highly efficient and selective adsorbents for this process. In this regard, ordered mesoporous materials (OMMs) possess high specific surface area, tunable pore size, large pore volume, as well as stable and interconnected frameworks with active pore surfaces for functionalization. Such features meet the requirements for enhanced adsorbents, not only providing huge reactional interface and large surface capable of accommodating guest species, but also enabling the possibility of ion‐specific binding for enrichment and separation purposes. This short personal account summarizes some of the recent advances in the use of porous hybrid materials as selective sorbents for REE separation and purification, with particular attention devoted to ordered mesoporous silica and carbon‐based sorbents.
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