Fast and selective fluoride ion conduction in sub-1-nanometer metal-organic framework channels
書誌事項
- 公開日
- 2019-06-11
- 権利情報
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- https://creativecommons.org/licenses/by/4.0
- https://creativecommons.org/licenses/by/4.0
- DOI
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- 10.1038/s41467-019-10420-9
- 公開者
- Springer Science and Business Media LLC
説明
<jats:title>Abstract</jats:title><jats:p>Biological fluoride ion channels are sub-1-nanometer protein pores with ultrahigh F<jats:sup>−</jats:sup> conductivity and selectivity over other halogen ions. Developing synthetic F<jats:sup>−</jats:sup> channels with biological-level selectivity is highly desirable for ion separations such as water defluoridation, but it remains a great challenge. Here we report synthetic F<jats:sup>−</jats:sup> channels fabricated from zirconium-based metal-organic frameworks (MOFs), UiO-66-X (X = H, NH<jats:sub>2</jats:sub>, and N<jats:sup>+</jats:sup>(CH<jats:sub>3</jats:sub>)<jats:sub>3</jats:sub>). These MOFs are comprised of nanometer-sized cavities connected by sub-1-nanometer-sized windows and have specific F<jats:sup>−</jats:sup> binding sites along the channels, sharing some features of biological F<jats:sup>−</jats:sup> channels. UiO-66-X channels consistently show ultrahigh F<jats:sup>−</jats:sup> conductivity up to ~10 S m<jats:sup>−1</jats:sup>, and ultrahigh F<jats:sup>−</jats:sup>/Cl<jats:sup>−</jats:sup> selectivity, from ~13 to ~240. Molecular dynamics simulations reveal that the ultrahigh F<jats:sup>−</jats:sup> conductivity and selectivity can be ascribed mainly to the high F<jats:sup>−</jats:sup> concentration in the UiO-66 channels, arising from specific interactions between F<jats:sup>−</jats:sup> ions and F<jats:sup>−</jats:sup> binding sites in the MOF channels.</jats:p>
収録刊行物
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- Nature Communications
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Nature Communications 10 (1), 2490-, 2019-06-11
Springer Science and Business Media LLC