Optimizing selectivity via membrane molecular packing manipulation for simultaneous cation and anion screening

IF 3.5 2区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY
Qing-Wei Meng, Jianguo Li, Zhuozhi Lai, Weipeng Xian, Sai Wang, Fang Chen, Zhifeng Dai, Li Zhang, Hong Yin, Shengqian Ma, Qi Sun
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Abstract

Advancing membranes with enhanced solute-solute selectivity is essential for expanding membrane technology applications, yet it presents a notable challenge. Drawing inspiration from the unparalleled selectivity of biological systems, which benefit from the sophisticated spatial organization of functionalities, we posit that manipulating the arrangement of the membrane’s building blocks, an aspect previously given limited attention, can address this challenge. We demonstrate that optimizing the face-to-face orientation of building blocks during the assembly of covalent-organic-framework (COF) membranes improves ion-π interactions with multivalent ions. This optimization leads to extraordinary selectivity in differentiating between monovalent cations and anions from their multivalent counterparts, achieving selectivity factors of 214 for K+/Al3+ and 451 for NO3/PO43−. Leveraging this attribute, the COF membrane facilitates the direct extraction of NaCl from seawater with a purity of 99.57%. These findings offer an alternative approach for designing highly selective membrane materials, offering promising prospects for advancing membrane-based technologies.

Abstract Image

通过膜分子填料操作优化选择性,同时筛选阳离子和阴离子
提高膜对溶质-溶液的选择性对于扩大膜技术的应用至关重要,但这也是一个显著的挑战。生物系统无与伦比的选择性得益于复杂的功能空间组织,我们从生物系统的选择性中汲取灵感,认为操纵膜构件的排列(以前关注有限的一个方面)可以应对这一挑战。我们证明,在共价-有机框架(COF)膜的组装过程中,优化构件的面对面取向可以改善离子-π与多价离子的相互作用。这种优化使其在区分一价阳离子和阴离子与多价离子时具有非凡的选择性,对 K+/Al3+ 的选择性系数达到 214,对 NO3-/PO43- 的选择性系数达到 451。利用这一特性,COF 膜可直接从海水中提取氯化钠,纯度高达 99.57%。这些发现为设计高选择性膜材料提供了另一种方法,为推动膜技术的发展提供了广阔的前景。
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来源期刊
ACS Chemical Biology
ACS Chemical Biology 生物-生化与分子生物学
CiteScore
7.50
自引率
5.00%
发文量
353
审稿时长
3.3 months
期刊介绍: ACS Chemical Biology provides an international forum for the rapid communication of research that broadly embraces the interface between chemistry and biology. The journal also serves as a forum to facilitate the communication between biologists and chemists that will translate into new research opportunities and discoveries. Results will be published in which molecular reasoning has been used to probe questions through in vitro investigations, cell biological methods, or organismic studies. We welcome mechanistic studies on proteins, nucleic acids, sugars, lipids, and nonbiological polymers. The journal serves a large scientific community, exploring cellular function from both chemical and biological perspectives. It is understood that submitted work is based upon original results and has not been published previously.
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