Zn-BTC金属-有机骨架/纳米多孔石墨烯<i>通过原位</i>绿色合成高选择性分离稀土元素,Analytical Chemistry

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Zn-BTC金属-有机骨架/纳米多孔石墨烯通过原位绿色合成高选择性分离稀土元素
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-12-23 , DOI: 10.1021/acs.analchem.0c04407
Jinsheng Wu _{1,

2} , Zhan Li _{3,

4} , Hongxin Tan ₃ , Shaobo Du ₃ , Tianqi Liu ₃ , Yanli Yuan ₂ , Xiuhui Liu ₁ , Hongdeng Qiu _{3,

5}

Affiliation

稀土元素（REE）广泛用于许多领域的设备中，但要实现其选择性分离和纯化仍然是一项艰巨的任务。金属有机骨架（MOF）作为一种新兴的多孔晶体材料，已被用于利用尺寸选择性结晶特性对REE进行选择性分离。但是，到目前为止，几乎所有MOF都不能直接用于通过固态吸附在强酸中选择性分离REE 。在此，通过固相合成原位生长三甲基锌酸锌（Zn-BTC）MOF覆盖纳米多孔石墨烯的ZnO纳米粒子的制备制备具有强耐酸性的Zn-BTC MOF /纳米多孔石墨烯复合材料。所得复合材料对REE的吸附能力对离子半径高度敏感，这可能归因于REE离子与O配位形成稳定的结构。Ce / Lu的选择性约为10,000，而相邻REE之间的选择性（例如Nd / Pr）高达9.8极为重要，因此该复合材料迄今为止表现出最佳的分离性能。这项工作为Zn-BTC MOF /纳米多孔石墨烯提供了一种绿色，简便，规模化且有效的合成策略，有望将其直接应用于REE的分离工业中。

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Highly Selective Separation of Rare Earth Elements by Zn-BTC Metal–Organic Framework/Nanoporous Graphene via In Situ Green Synthesis

Rare earth elements (REEs) are used widely in devices of many fields, but it is still a troublesome task to achieve their selective separation and purification. Metal–organic frameworks (MOFs) as an emerging porous crystalline material have been used for selective separation of REEs using the size-selective crystallization properties. However, so far, almost all MOFs cannot be used directly for selective separation of REEs in strong acid via solid-state adsorption. Herein, a zinc-trimesic acid (Zn-BTC) MOF is grown by solid synthesis in situ on ZnO nanoparticles covering nanoporous graphene for preparing Zn-BTC MOF/nanoporous graphene composites with strong acid resistance. The adsorption capacity of the resulting composites to REEs is highly sensitive to the ionic radius, which may be attributed to the fact that the REE ions coordinate with O to form a stable structure. The selectivity of Ce/Lu is ≈10,000, and it is extremely important that the selectivity between adjacent REEs (e.g., Nd/Pr) is as high as ≈9.8, so the composite exhibits the best separation performance so far. This work provides a green, facile, scale, and effective synthesis strategy of Zn-BTC MOF/nanoporous graphene, which is hopefully applied directly in the separation industries of REEs.

更新日期：2021-01-26

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