Tuning of Microenvironment in Covalent Organic Framework via Fluorination Strategy promotes Selective CO2 Capture

Nitumani Das, Ratul Paul, Rupak Chatterjee, Digambar Balaji Shinde, Zhiping Lai, Asim Bhaumik, John Mondal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Herein, we have designed and synthesized two heteroatom (N, O) rich covalent organic frameworks (COF), PD-COF and TF-COF, respectively, to demonstrate their relative effect on CO2 adsorption capacity and also CO2/N2 selectivity. Compared to the non-fluorinated PD-COF (BET surface area 805 m2 g−1, total pore volume 0.3647 ccg−1), a decrease in BET surface area and also pore volume have been observed for fluorinated TF-COF due to the incorporation of fluorine to the porous framework (BET surface area 451 m2 g−1, total pore volume 0.2978 ccg−1). This fact leads to an enormous decrease in the CO2 adsorption capacity and CO2/N2 selectivity of TF-COF, though it shows stronger affinity towards CO2 with a Qst of 37.76 KJ/mol. The more CO2 adsorption capacity by PD-COF can be attributed to the large specific surface area with considerable amount of micropore volume compared to the TF-COF. Further, PD-COF exhibited CO2/N2 selectivity of 16.8, higher than that of TF-COF (CO2/N2 selectivity 13.4).

Original languageEnglish (US)
Article numbere202200970
JournalChemistry - An Asian Journal
Volume18
Issue number1
DOIs
StatePublished - Jan 3 2023

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • CO adsorption
  • CO/N selectivity
  • Covalent organic framework
  • Fluorination

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry

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