Turing covalent organic framework membranes via heterogeneous nucleation synthesis for organic solvent nanofiltration

Fan Yang, Jing Guo, Chengzhe Han, Junhui Huang, Zhiwei Zhou, Shi Peng Sun, Yanqiu Zhang, Lu Shao

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12 引用 (Scopus)

摘要

Although covalent organic frameworks (COFs) demonstrate notable potential for developing advanced separation membranes, contemporary COF membranes still lack controlled stacking and highly efficient sieving. Here, Turing-architecture COF membranes were constructed by engineering a reaction-diffusion assembly process via heterogeneous nucleation synthesis with tannic acid (TA). TA covalently binds with amine monomers to form a composite precursor with increased reactivity and decreased diffusivity. This altered the pathway of Schiff base reactions with aldehyde monomers, fulfilling suitable reaction-diffusion conditions, and ultimately formed the labyrinthine stripe or spot-patterned Turing COF film with controlled stacking and uniform pore structure. This endows our COF membrane with highly efficient molecule sieving ability for organic solvent nanofiltration while exhibiting a flux that is 621% greater than that of commercial membranes. Thus, this study provides a paradigm for the in situ synthesis of highly efficient COF membranes for diversely sustainable separations.

源语言英语
文章编号eadr9260
期刊Science advances
10
50
DOI
出版状态已出版 - 13 12月 2024

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