A nature-inspired hydrogen-bonded supramolecular complex for selective copper ion removal from water

Ngoc T. Bui, Hyungmook Kang, Simon J. Teat, Gregory M. Su, Chih-Wen Pao, Yi-Sheng Liu, Edmond W. Zaia, Jinghua Guo, Jeng-Lung Chen, Katie R. Meihaus, Chaochao Dun, Tracy M. Mattox, Jeffrey R. Long, Peter Fiske, Robert Kostecki and Jeffrey J. Urban ()
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Ngoc T. Bui: The Molecular Foundry, Lawrence Berkeley National Laboratory
Hyungmook Kang: The Molecular Foundry, Lawrence Berkeley National Laboratory
Simon J. Teat: Advanced Light Sources, Lawrence Berkeley National Laboratory
Gregory M. Su: Advanced Light Sources, Lawrence Berkeley National Laboratory
Chih-Wen Pao: National Synchrotron Radiation Research Center, Hsinchu Science Park
Yi-Sheng Liu: Advanced Light Sources, Lawrence Berkeley National Laboratory
Edmond W. Zaia: The Molecular Foundry, Lawrence Berkeley National Laboratory
Jinghua Guo: Advanced Light Sources, Lawrence Berkeley National Laboratory
Jeng-Lung Chen: National Synchrotron Radiation Research Center, Hsinchu Science Park
Katie R. Meihaus: Departments of Chemistry, University of California
Chaochao Dun: The Molecular Foundry, Lawrence Berkeley National Laboratory
Tracy M. Mattox: The Molecular Foundry, Lawrence Berkeley National Laboratory
Jeffrey R. Long: Departments of Chemistry, University of California
Peter Fiske: Water-Energy Resilience Research Institute, Lawrence Berkeley National Laboratory
Robert Kostecki: Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory
Jeffrey J. Urban: The Molecular Foundry, Lawrence Berkeley National Laboratory

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Herein, we present a scalable approach for the synthesis of a hydrogen-bonded organic–inorganic framework via coordination-driven supramolecular chemistry, for efficient remediation of trace heavy metal ions from water. In particular, using copper as our model ion of interest and inspired by nature’s use of histidine residues within the active sites of various copper binding proteins, we design a framework featuring pendant imidazole rings and copper-chelating salicylaldoxime, known as zinc imidazole salicylaldoxime supramolecule. This material is water-stable and exhibits unprecedented adsorption kinetics, up to 50 times faster than state-of-the-art materials for selective copper ion capture from water. Furthermore, selective copper removal is achieved using this material in a pH range that was proven ineffective with previously reported metal–organic frameworks. Molecular dynamics simulations show that this supramolecule can reversibly breathe water through lattice expansion and contraction, and that water is initially transported into the lattice through hopping between hydrogen-bond sites.

Date: 2020
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DOI: 10.1038/s41467-020-17757-6

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