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    Oriented Zeolitic Imidazolate Framework (ZIF) Nanocrystal Films for Molecular Separation Membranes

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    O_Oriented.pdf
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    Type
    Article
    Authors
    Wang, Shaofei cc
    Liu, Jiangtao
    Pulido Ponce de Leon, Bruno Antonio cc
    Li, Yifan
    Mahalingam, Dinesh cc
    Nunes, Suzana Pereira cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Nanostructured Polymeric Membrane Lab
    Date
    2020-04-02
    Online Publication Date
    2020-04-02
    Print Publication Date
    2020-04-24
    Permanent link to this record
    http://hdl.handle.net/10754/662471
    
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    Abstract
    The direct synthesis of oriented, defect-free nanocrystal metal–organic framework (MOF) films is a challenging step toward their applications in advanced technologies, such as optics, sensing, and membrane-based separations. Here, we propose a one-step, in-situ growth approach to synthesize oriented zeolitic imidazolate framework-L (ZIF-L) membranes by using an isoporous film as the support. The high metal-binding efficiency, as well as the ordered pore structure, given by the polymeric isoporous support, promote the preferred nucleation and rapid growth of vertically aligned ZIF-L nanocrystals to construct dense membranes. Vertically aligned nanochannels between the inter-lattice of ZIF-L are therefore formed through the polycrystalline membrane. The membrane exhibited a high H2 permeance, 1635 GPU (1 GPU= 1 × 10−6 cm3 (STP)/cm2 s cmHg), and H2/C3H8 selectivity of 516, when targeting hydrogen separation from hydrocarbon in a steam reforming process. The membrane can be further used in organic solvents nanofiltrations, with a methanol permeance of 38.7 L m−2 h−1 bar−1, and >90% rejection of organic dye molecules. Furthermore, by taking advantage of the anisotropic pore structure, the ZIF-L membrane could be further hydrolyzed to produce ultrathin ZIF-L nanosheets with a thickness ~5 nm, which provides a facile platform to synthesize two-dimensional MOFs nanosheets
    Citation
    Wang, S., Liu, J., Pulido, B., Li, Y., Mahalingam, D., & Nunes, S. P. (2020). Oriented Zeolitic Imidazolate Framework (ZIF) Nanocrystal Films for Molecular Separation Membranes. ACS Applied Nano Materials. doi:10.1021/acsanm.0c00570
    Sponsors
    The authors thank King Abdullah University of Science and Technology for the financial support, in particular the CRG6 grant URF/1/3441-01-01. We also thank Professor Zachary P. Smith from Massachusetts Institute of Technology (MIT) for helpful discussion.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Nano Materials
    DOI
    10.1021/acsanm.0c00570
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsanm.0c00570
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsanm.0c00570
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program

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