Solvent-Influenced Fragmentations in Free-Standing Three-Dimensional Covalent Organic Framework Membranes for Hydrophobicity Switching

Abdul Khayum Mohammed, Ayesha A. Al Khoori, Matthew A. Addicoat, Sabu Varghese, Israa Othman, Maguy Abi Jaoude, Kyriaki Polychronopoulou, Maria Baias, Mohammad Abu Haija, Dinesh Shetty

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The ordered open organic frameworks membranes are attractive candidates for flow-assisted molecular separations. The physicochemical properties of such membranes mostly depend on their selectively chosen functional building blocks. In this work, we have introduced a novel concept of functional switchability of three-dimensional covalent organic framework (3D-COF) membranes through a simple solvent-influenced fragmentation method. This room-temperature interfacial synthesis provides free-standing 3D-COF membranes with distinct physicochemical properties from the same building monomers. Notably, the change of solvent from chloroform to ethyl acetate switches the membrane property from hydrophilic (water contact angle 60°) to hydrophobic (water contact angle 142°) nature. The hydrophobic 3D-COF membrane selectively passes oil molecules from an oil–water emulsion with a gravitational flux of 1536 L m−2 h−1.

Original languageBritish English
Article numbere202200905
JournalAngewandte Chemie - International Edition
Volume61
Issue number13
DOIs
StatePublished - 21 Mar 2022

Keywords

  • Covalent Organic Framework
  • Halogen Bond
  • Hydrophobicity
  • Membranes
  • Oil–Water Separation

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