Fluorinated covalent triazine frameworks for effective CH4 separation and iodine vapor uptake

Poyi Tu, Xunming He, Raed Abu-Reziq, Chunyue Pan, Juntao Tang*, Guipeng Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


In this article, analogous covalent triazine framework (CTFs) were simply prepared through the trimerization of different nitrile building blocks (tetrafluoroterephthalonitrile or terephthalonitrile) under typical ionothermal conditions. We demonstrated that the fluorine contents could be simply altered by changing the comonomer compositions. Introducing fluorine could adjust the pore size distribution and electron structure of the network effectively. By increasing fluorine contents, an enhanced CO2/CH4 selectivity up to 15.5 was presented. Additionally, electron-concentrated fluorine strengthened CH/π interactions between the polymeric matrixes and guest CH4, offering a CH4/N2 selectivity up to 8.0. The obtained CTFs also exhibited noticeable iodine adsorption capacity in vapor phase (302 wt%) due to their abundance of heteroatoms and porosity. These results clearly demonstrated the promising aspect of introducing fluorine groups into the porous networks for developing efficient sorbent towards potential applications in separating methane gas or iodine vapors and also affording further insight into the development of high performance functional polymers.

Original languageAmerican English
Article number120857
JournalSeparation and Purification Technology
StatePublished - 1 Jun 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.


  • Covalent Triazine Frameworks
  • Fluorine
  • Iodine Vapor Adsorption
  • Methane Separation


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