Affiliation:
1. Key Laboratory of Material Chemistry for Energy Conversion and Storage School of Chemistry and Chemical Engineering Huazhong University of Science and Technology 430074 Wuhan P. R. China
Abstract
AbstractEfficient Mg2+/Li+ separation is crucial to combating the lithium shortage worldwide, yet current nanofiltration membranes suffer from low efficacy and/or poor scalability, because desirable properties of membranes are entangled and there is a trade‐off. This work reports a “tagged‐modification” approach to tackle the challenge. A mixture of 3‐bromo‐trimethylpropan‐1‐aminium bromide (E1) and 3‐aminopropyltrimethylazanium (E2) was designed to modify polyethylenimine – trimesoyl chloride (PEI‐TMC) membranes. E1 and E2 reacted with the PEI and TMC, respectively, and thus, the membrane properties (hydrophilicity, pore sizes, charge) were untangled and intensified simultaneously. The permeance (34.3 L m−2 h−1 bar−1) and Mg2+/Li+ selectivity (23.2) of the modified membranes are about 4 times and 2 times higher than the pristine membrane, and they remain stable in a 30‐days test. The permeance is the highest among all analogous nanofiltration membranes. The tagged‐modification method enables the preparation of large‐area membranes and modules that produce high‐purity lithium carbonate (Li2CO3) from simulated brine.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
Subject
General Chemistry,Catalysis
Cited by
2 articles.
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