Biomimetic construction of smart nanochannels in covalent organic framework membranes for efficient ion separation

被引：30

作者：

Ren, Liang ^{[1
]}

Chen, Jianxin ^{[2
]}

Han, Jian ^{[2
]}

Liang, Jinsheng ^{[1
]}

Wu, Hong ^{[3
]}

机构：

[1] Hebei Univ Technol, Key Lab Special Funct Mat Ecol Environm & Informat, Minist Educ, Tianjin 300130, Peoples R China

[2] Hebei Univ Technol, Sch Chem Engn & Technol, Tianjin 300130, Peoples R China

[3] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2024年 / 482卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Biomimetic construction; Azobenzene; Smart nanochannels; COF membranes; Ion separation; PLATFORM;

D O I：

10.1016/j.cej.2024.148907

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Smart nanochannels can regulate ion transport behavior by external stimulus and display precise ion selectivity in biological membrane systems, but constructing artificial membranes with responsive and tunable channel remains a severe challenge. Herein, smart covalent organic framework (COF) membranes decorated with photoresponsive azobenzene derivatives (COF-Azo) were fabricated by a biomimetic nanochannel modulation (BNM) strategy, endowing membranes with charged and switchable sub-nanochannels. Under different wavelength of light, the smart COF-Azo membranes simultaneously exhibited outstanding mono/monovalent and mono/ divalent ion selectivity (K+/Li+ ideal selectivity of 17.9 and Li+/Mg2+ ideal selectivity of 24.9) via closing and opening channels. The conversion of effective pore size at angstrom level is realized by photoisomerization of azobenzene. After several photoswitch cycles, the smart membranes still maintained K+/Li+ selectivity of 6.1 and Li+/Mg2+ selectivity of 20.7 in mixed salt solution, exhibiting great potentials in lithium extraction. This work may blaze a trail in constructing photo-responsive nanochannel membranes for energy-efficient ion separation.

引用

页数：10

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