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Dual-functional regulation of nanofiltration membranes using covalent organic framework nanosheets for efficient Li+/Mg2+ separation
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Z
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M
S
J
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DOI：10.1002/aic.70522.png)
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Abstract
En 中文
With growing demand for lithium resources, developing high-performance Li+/Mg2+ separation methods for salt-lake brines has become crucial, especially the highly efficient energy-saving membrane technology. For the traditional nanofiltration (NF) membranes for mono−/multivalent ion separation, achieving simultaneously high permeance and selectivity for lithium extraction from brine remained a critical challenge. Herein, we proposed a kind of cationic covalent organic frameworks (COF), TpEBr nanosheets with positive charge and structural regulation capability as dual-functional regulator for polyamide (PA) NF membranes. The introduction of TpEBr as additive reduced the diffusion rate of polyethyleneimine (PEI), forming a thin and loose membrane. Additionally, quaternary ammonium groups on TpEBr increased the membrane's surface Zeta potential, significantly strengthening the Donnan exclusion effect. The optimized membrane exhibited a significant Li+/Mg2+ selectivity of 46.4 with a 25% increase in permeance. Such dual-functional regulation strategy for constructing high-performance NF membranes proposed in this work is promising for future highly efficient lithium extraction from brines.
Keywords:
COF nanosheets
Li+/Mg2+ separation
membrane separation
nanofiltration membrane
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2.9W
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