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Ultrafast ion sieving using nanoporous polymeric membranes

Wang, Pengfei and Wang, Mao and Liu, Feng and Ding, Siyuan and Wang, Xue and Du, Guanghua and Liu, Jie and Apel, Pavel and Kluth, Patrick and Trautmann, Christina and Wang, Yugang (2018):
Ultrafast ion sieving using nanoporous polymeric membranes.
In: Nature Communications, Nature, p. 569, 9, (1), ISSN 2041-1723, DOI: 10.1038/s41467-018-02941-6, [Online-Edition: https://doi.org/10.1038/s41467-018-02941-6],
[Article]

Abstract

The great potential of nanoporous membranes for water filtration and chemical separation has been challenged by the trade-off between selectivity and permeability. Here we report on nanoporous polymer membranes with an excellent balance between selectivity and permeability of ions. Our membranes are fabricated by irradiating 2-μm-thick polyethylene terephthalate Lumirror® films with GeV heavy ions followed by ultraviolet exposure. These membranes show a high transport rate of K+ ions of up to 14 mol h−1 m−2 and a selectivity of alkali metal ions over heavy metal ions of >500. Combining transport experiments and molecular dynamics simulations with a polymeric nanopore model, we demonstrate that the high permeability is attributable to the presence of nanopores with a radius of ~0.5 nm and a density of up to 5 × 1010 cm−2, and the selectivity is ascribed to the interaction between the partially dehydrated ions and the negatively charged nanopore wall.

Item Type: Article
Erschienen: 2018
Creators: Wang, Pengfei and Wang, Mao and Liu, Feng and Ding, Siyuan and Wang, Xue and Du, Guanghua and Liu, Jie and Apel, Pavel and Kluth, Patrick and Trautmann, Christina and Wang, Yugang
Title: Ultrafast ion sieving using nanoporous polymeric membranes
Language: English
Abstract:

The great potential of nanoporous membranes for water filtration and chemical separation has been challenged by the trade-off between selectivity and permeability. Here we report on nanoporous polymer membranes with an excellent balance between selectivity and permeability of ions. Our membranes are fabricated by irradiating 2-μm-thick polyethylene terephthalate Lumirror® films with GeV heavy ions followed by ultraviolet exposure. These membranes show a high transport rate of K+ ions of up to 14 mol h−1 m−2 and a selectivity of alkali metal ions over heavy metal ions of >500. Combining transport experiments and molecular dynamics simulations with a polymeric nanopore model, we demonstrate that the high permeability is attributable to the presence of nanopores with a radius of ~0.5 nm and a density of up to 5 × 1010 cm−2, and the selectivity is ascribed to the interaction between the partially dehydrated ions and the negatively charged nanopore wall.

Journal or Publication Title: Nature Communications
Volume: 9
Number: 1
Publisher: Nature
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
Date Deposited: 10 Dec 2018 09:01
DOI: 10.1038/s41467-018-02941-6
Official URL: https://doi.org/10.1038/s41467-018-02941-6
Funders: This work was supported by National Science Foundation of China (Grant Nos. 11335003 and 31670852) and the National Magnetic Confinement Fusion Energy Research Project of China (2015GB113000)., F.L. acknowledges the support from Peking University’s 100-talent plan., P.K. acknowledges the Australian Research Council for financial support., Christina Trautmann acknowledges support from the Deutsche Forschungsgemeinschaft (DFG-FOR1583)., The MD simulation was performed on the High Performance Computing Platform of the Center for Life Sciences, Peking University. Author information Author notes P. Wang and M. Wang contributed equally to this work. Affiliations State Key Laborato
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