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Title: Fast and selective fluoride ion conduction in sub-1-nanometer metal-organic framework channels

Journal Article · · Nature Communications

Biological fluoride ion channels are sub-1-nanometer protein pores with ultrahigh F- conductivity and selectivity over other halogen ions. Developing synthetic F- 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- channels fabricated from zirconium-based metal-organic frameworks (MOFs), UiO-66-X ( x = H, NH2, and N+(CH3)3). These MOFs are comprised of nanometer-sized cavities connected by sub-1-nanometer-sized windows and have specific F- binding sites along the channels, sharing some features of biological F- channels. UiO-66-X channels consistently show ultrahigh F- conductivity up to ~10 S m-1, and ultrahigh F-/Cl- selectivity, from ~13 to ~240. Molecular dynamics simulations reveal that the ultrahigh F- conductivity and selectivity can be ascribed mainly to the high F- concentration in the UiO-66 channels, arising from specific interactions between F- ions and F- binding sites in the MOF channels.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Materials for Water and Energy Systems (M-WET); Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Australian Research Council; Australia-China Science and Research Fund
Grant/Contract Number:
SC0019272; DP150100765; DP180100298; DE170100006; ACSRF48154
OSTI ID:
1613158
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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