A perfluorinated covalent triazine-based framework for highly selective and water-tolerant CO2 capture

Yunfeng Zhao, Kexin Yao, Baiyang Teng, Tong Zhang, Yu Han

Research output: Contribution to journalArticlepeer-review

278 Scopus citations

Abstract

We designed and synthesized a perfluorinated covalent triazine-based framework (FCTF-1) for selective CO2 capture. The incorporation of fluorine (F) groups played multiple roles in improving the framework's CO 2 adsorption and separation capabilities. Thermodynamically, the strongly polar C-F bonds promoted CO2 adsorption via electrostatic interactions, especially at low pressures. FCTF-1's CO2 uptake was 1.76 mmol g-1 at 273 K and 0.1 bar through equilibrium adsorption, exceeding the CO2 adsorption capacity of any reported porous organic polymers to date. In addition, incorporating F groups produced a significant amount of ultra-micropores (<0.5 nm), which offered not only high gas adsorption potential but also kinetic selectivity for CO2-N 2 separation. In mixed-gas breakthrough experiments, FCTF-1 exhibited an exceptional CO2-N2 selectivity of 77 under kinetic flow conditions, much higher than the selectivity (31) predicted from single-gas equilibrium adsorption data. Moreover, FCTF-1 proved to be tolerant to water and its CO2 capture performance remained excellent when there was moisture in the gas mixture, due to the hydrophobic nature of the C-F bonds. In addition, the moderate adsorbate-adsorbent interaction allowed it to be fully regenerated by pressure swing adsorption processes. These attributes make FCTF-1 a promising sorbent for CO2 capture from flue gas. © 2013 The Royal Society of Chemistry.
Original languageEnglish (US)
Pages (from-to)3684
JournalEnergy and Environmental Science
Volume6
Issue number12
DOIs
StatePublished - 2013

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment

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