Journal
SCIENCE
Volume 378, Issue 6617, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abo5680
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Funding
- Natural Science Foundation of China [21736001]
- National Key Research and Development Program of China [2021YFC2101203]
- Beijing Institute of Technology Research Fund Program for Young Scholars
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This study presents a strategy to create highly flexible metal-organic framework nanosheet membranes for alcohol-water separation. The membranes exhibited ultrafast transport channels and achieved high flux and separation performance.
High-performance pervaporation membranes have potential in industrial separation applications, but overcoming the permeability-selectivity trade-off is a challenge. We report a strategy to create highly flexible metal-organic framework nanosheet (MOF-NS) membranes with a faveolate structure on polymer substrates for alcohol-water separation. The controlled growth followed by a surface-coating method effectively produced flexible and defect-free superhydrophobic MOF-NS membranes. The reversible deformation of the flexible MOF-NS and the vertical interlamellar pathways were captured with electron microscopy. Molecular simulations confirmed the structure and revealed transport mechanism. The ultrafast transport channels in MOF-NS exhibited an ultrahigh flux and a separation factor of 8.9 in the pervaporation of 5 weight % ethanol-water at 40 degrees C, which can be used for biofuel recovery. MOF-NS and polydimethylsiloxane synergistically contribute to the separation performance.
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