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Developing advanced materials for gas separation is crucial. New fluorinated covalent organic frameworks (COFs) show improved acetylene from carbon dioxide separation, highlighting fluorination

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Efficient separation of acetylene (C2H2) from carbon dioxide (CO2) is challenging due to similar molecular properties.
  • Developing selective adsorbents is critical for acetylene purification in industrial processes.

Purpose of the Study:

  • To design and synthesize novel covalent organic frameworks (COFs) for enhanced C2H2/CO2 separation.
  • To investigate the effect of fluorination on the separation performance of COFs.

Main Methods:

  • Synthesis of two-dimensional isoreticular COFs (TP-TFPB-COF and TP-NFPB-COF) via [3+3] imine condensation.
  • Gas adsorption and selectivity measurements (IAST) at 298 K and 1 bar.
  • Grand canonical Monte Carlo (GCMC) simulations to understand adsorption mechanisms.

Main Results:

  • TP-NFPB-COF, with higher fluorine content, demonstrated superior C2H2/CO2 selectivity (2.86) compared to TP-TFPB-COF (2.04).
  • GCMC simulations indicated that increased pore polarity and C-H⋯F interactions enhance C2H2 affinity.
  • The study successfully correlated framework fluorination with improved gas separation performance.

Conclusions:

  • Fluorination is an effective strategy for tuning COF pore environments and enhancing acetylene separation.
  • The reported COFs show promise as selective adsorbents for acetylene purification.
  • This research advances the application of COFs in challenging gas separation processes.