Efficient metal ion sieving in rectifying subnanochannels enabled by metal-organic frameworks.,Nature Materials

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Efficient metal ion sieving in rectifying subnanochannels enabled by metal-organic frameworks.
Nature Materials ( IF 37.2 ) Pub Date : 2020-03-09 , DOI: 10.1038/s41563-020-0634-7
Jun Lu ₁ , Huacheng Zhang ₁ , Jue Hou ₁ , Xingya Li ₁ , Xiaoyi Hu ₁ , Yaoxin Hu ₁ , Christopher D Easton ₂ , Qinye Li ₁ , Chenghua Sun ₃ , Aaron W Thornton ₄ , Matthew R Hill _{1,

2} , Xiwang Zhang ₁ , Gengping Jiang ₅ , Jefferson Zhe Liu ₆ , Anita J Hill _{2,

4} , Benny D Freeman ₇ , Lei Jiang _{1,

8} , Huanting Wang ₁

Affiliation

Biological ion channels have remarkable ion selectivity, permeability and rectification properties, but it is challenging to develop artificial analogues. Here, we report a metal-organic framework-based subnanochannel (MOFSNC) with heterogeneous structure and surface chemistry to achieve these properties. The asymmetrically structured MOFSNC can rapidly conduct K+, Na+ and Li+ in the subnanometre-to-nanometre channel direction, with conductivities up to three orders of magnitude higher than those of Ca2+ and Mg2+, equivalent to a mono/divalent ion selectivity of 103. Moreover, by varying the pH from 3 to 8 the ion selectivity can be tuned further by a factor of 102 to 104. Theoretical simulations indicate that ion-carboxyl interactions substantially reduce the energy barrier for monovalent cations to pass through the MOFSNC, and thus lead to ultrahigh ion selectivity. These findings suggest ways to develop ion selective devices for efficient ion separation, energy reservation and power generation.

中文翻译：

高效的金属离子筛分，可对金属有机骨架实现的亚纳米通道进行整流。

生物离子通道具有显着的离子选择性，渗透性和整流特性，但开发人工类似物具有挑战性。在这里，我们报告基于金属有机框架的亚纳米通道（MOFSNC）具有异质结构和表面化学，以实现这些特性。非对称结构的MOFSNC可以在亚纳米到纳米的通道方向上快速传导K +，Na +和Li +，其电导率比Ca2 +和Mg2 +的电导率高三个数量级，相当于103的单/二价离子选择性。，通过将pH从3更改为8，可以将离子选择性进一步调整102到104。理论模拟表明，离子与羧基的相互作用大大降低了单价阳离子通过MOFSNC的能垒，从而导致超高的离子选择性。这些发现提出了开发用于有效离子分离，能量保留和发电的离子选择装置的方法。

更新日期：2020-04-24

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