Ultrafast ion sieving using nanoporous polymeric membranes
| Autor: | Pavel Yu Apel, Xue Wang, Guanghua Du, Yugang Wang, Feng Liu, Jie Liu, Mao Wang, Patrick Kluth, Pengfei Wang, Siyuan Ding, Christina Trautmann |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Science Metal ions in aqueous solution Synthetic membrane General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Ion chemistry.chemical_compound Polyethylene terephthalate lcsh:Science Multidisciplinary Nanoporous technology industry and agriculture General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Nanopore Membrane chemistry Chemical engineering lcsh:Q ddc:500 0210 nano-technology Selectivity |
| Zdroj: | Nature Communications 9(1), 569 (2018). doi:10.1038/s41467-018-02941-6 Nature Communications, Vol 9, Iss 1, Pp 1-9 (2018) Nature Communications |
| DOI: | 10.1038/s41467-018-02941-6 |
| Popis: | 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. Nanoporous membranes show great potential for ionic separations, but the typical trade-off between permeability and selectivity hinders their applicability. Here the authors fabricate nanoporous polymeric membranes with a high density of 0.5 nm pores and demonstrate their exceptional performance for ion sieving. |
| Databáze: | OpenAIRE |
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