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Microporous membrane with ionized sub-nanochannels enabling highly selective monovalent and divalent anion separation
Mei-Ling Liu1,2, Yu Chen1, Chuan Hu3
1State Key Laboratories of Materials-Oriented Chemical Engineering, National Engineering Research Center for Special Separation Membranes, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, China.
Nature Communications
|August 23, 2024
Summary
New sub-nanochannel membranes using Tröger
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Selective ion transport membranes are crucial for sustainability in water treatment, resource recovery, and energy applications.
- Polymers of intrinsic microporosity (PIM) offer uniform, durable nanochannels but suffer from weak ion interactions.
Purpose of the Study:
- To engineer functionalized sub-nanochannels in PIM membranes to enhance ion transport and selectivity.
- To overcome the limitations of weak ion interactions in existing PIM nanochannels.
Main Methods:
- Incorporation of randomly twisted V-shaped Tröger's Base units and quaternary ammonium groups into PIMs.
- Creation of ionized sub-nanochannels with precise window sizes (5.89–6.54 Å).
Main Results:
- Achieved enhanced dehydrated monovalent ion transport.
- Demonstrated exceptional ion selectivity: 106 for Cl-/CO32- and 82 for Cl-/SO42-.
- Surpassed the performance of state-of-the-art membranes.
Conclusions:
- Developed an efficient template for functionalized sub-nanometer channels in PIM membranes.
- Paved the way for precise ion separation applications through improved membrane design.
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