Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-019-10420-9
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Funding
- Australian Government Department of Industry, Innovation, and Science through the Australia-China Science and Research Fund [ACSRF48154]
- Australian Research Council [DP150100765, DP180100298, DE170100006]
- Center for Materials for Water and Energy Systems (M-WET), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0019272]
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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 similar to 10 S m(-1), and ultrahigh F-/Cl- selectivity, from similar to 13 to similar 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.
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