2025-04-30 中国科学院（CAS）
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＜関連情報＞
- https://english.cas.cn/newsroom/research_news/chem/202504/t20250427_1042154.shtml
- https://www.nature.com/articles/s41467-025-59188-1
他のイオンからLi+を選択的にふるい分けるためのランダム配向共有結合有機フレームワーク膜 Randomly oriented covalent organic framework membrane for selective Li+ sieving from other ions
Shiwen Bao,Zhaoyu Ma,Lei Yu,Qi Li,Jiaxiang Xia,Song Song,Kunyan Sui,Yongye Zhao,Xueli Liu & Jun Gao
Nature Communications Published:24 April 2025
DOI:https://doi.org/10.1038/s41467-025-59188-1
Abstract
Certain biological channels exhibit remarkable selectivity, effectively distinguishing between competing cations. If artificial membranes could achieve similar precision in differentiating competing ions from Li+, it could advance sustainable technologies in lithium extraction. In this study, we present a covalent organic framework (COF) membrane featuring a randomly oriented structure that enables selective separation of major competing ions from Li+. The random orientation results in narrow pores, which impart size-based selectivity among alkaline ions. Additionally, the COF incorporates sulfonic groups that preferentially bind to Na+ and K+, facilitating their transport while retaining Li+. These synergistic mechanisms endow the membrane with a selectivity beyond detection limit for K+ and Na+ over Li+. When driven by an electrical potential, the ion flux through the membrane is enhanced by over an order of magnitude. Notably, the membrane also permits the transport of Mg2+ and Ca2+ while still rejecting Li+, leveraging differences in their ion mobility. This work should advance the design and construction of biomimetic materials for the extraction of valuable species from seawater and other aqueous sources.
