Ultra-permeable zeolitic imidazolate frameworks-intercalated graphene oxide membranes for unprecedented ultrafast molecular separation

Ting Chen (Lead Author), Fraz Saeed Butt, Mei Zhang, Xiuming Wei, Allana Lewis, Norbert Radacsi, Andrea J. Correia Semião, Yi Huang* (Lead Author), Jilong Han

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Membranes with ultrafast solvent transport for precise molecular separations are desired to reduce the energy consumption in the separation processes. Graphene oxide (GO)-based membranes have tremendous potential for precise molecular filtration. However, the construction of well-defined interlayer channels that overcome permeance-rejection trade-off is still fundamentally challenging. In this work, molecule selective GO/MOF membranes with ultrafast diffusion nanochannels were fabricated via in situ self-assembly of zeolitic imidazolate framework-8 (ZIF-8) in the GO interlayers using a facile vacuum-assisted filtration method. The obtained lamellar GO/MOF membranes with well-defined nanochannels showed unprecedented ultrafast solvent transport, with acetone and methanol permeance up to ~10,000 L m−2 h−1 bar−1 and ~6,800 L m−2 h−1 bar−1, respectively. More importantly, these membranes provided smart, selective separation performance for various binary dye mixtures with separation efficiencies higher than 95%, achieving precise separation of small organic molecules at a transport rate which is over two orders of magnitude higher than that of reported organic solvent nanofiltration membranes. Their high permeation flux as well as precise size-selective molecular recognition make them a promising candidate for energy-efficient molecular separations.
Original languageEnglish
Pages (from-to)129507
JournalChemical Engineering Journal
Volume419
Early online date29 Mar 2021
DOIs
Publication statusPublished - 1 Sep 2021

Keywords

  • Lamellar membrane
  • Graphene oxide
  • Ultra-permeable
  • Molecular separation

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