2026-10-14T04:17:50Z
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2026-09-14T06:14:41Z
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Aqueous Synthesis
of Ionic Covalent Organic Framework
Nanosheets towards Membrane-Based Li<sup>+</sup>/Mg<sup>2+</sup> Separation
Hao Deng (409186)
Yong Zhu (71382)
Kai Xu (122914)
Xiao Pang (4585543)
Yanqiu Lu (9012458)
Yu Zheng (2950)
Ying Wang (11406)
Bohui Lyu (15666123)
Runnan Zhang (3916859)
Zhongyi Jiang (583925)
Sui Zhang (359802)
Biophysics
Biochemistry
Space Science
Medicine
Microbiology
Cell Biology
Chemical Sciences not elsewhere classified
Sociology
Immunology
tubular membrane module
ideal building blocks
enabling precise control
amine monomers suppresses
adjusting brønsted acids
high volumetric yield
2 +</ sup
dominated cof growth
aqueous synthesis method
sup >+</ sup
cof nanosheets via
aqueous synthesis
unresolved challenge
two factors
recovery efficiency
reaction kinetics
performance membranes
mildly synthesized
ionic groups
homogeneous nucleation
gram scale
fabricating high
excellent processability
decapping strategy
decapping rate
cof nanosheets
bases concentrations
aldehyde groups
Covalent organic framework (COF) nanosheets are ideal
building
blocks for fabricating high-performance membranes. The production
of COF nanosheets in water is a significant step towards sustainable
synthesis but remains an unresolved challenge. Herein, we report an
aqueous synthesis method for COF nanosheets via a group capping-decapping
strategy. The in-plane-dominated COF growth is driven by two factors:
first, capping of aldehyde groups with secondary amines enhances monomer
solubility in water for homogeneous nucleation; second, the presence
of ionic groups on amine monomers suppresses out-of-plane stacking
via electrostatic repulsion. By adjusting Brønsted acids or bases
concentrations, the decapping rate and the subsequent COF polymerization
rate can be tuned, enabling precise control over the reaction kinetics.
Consequently, highly crystalline ionic COF nanosheets can be mildly
synthesized in water with high volumetric yield and at a gram scale.
The COF composite membranes assembled from nanosheets and polyethylenimine
exhibit high selectivity and outstanding Li<sup>+</sup> recovery efficiency
for Li<sup>+</sup>/Mg<sup>2+</sup> separation. Furthermore, the excellent
processability of COF nanosheets is demonstrated by fabricating the
tubular membrane module.
2026-09-14T00:00:00Z
Dataset
Dataset
10.1021/acsnano.6c10882.s001
https://figshare.com/articles/dataset/Aqueous_Synthesis_of_Ionic_Covalent_Organic_Framework_Nanosheets_towards_Membrane-Based_Li_sup_sup_Mg_sup_2_sup_Separation/33719503
CC BY-NC 4.0