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Frontiers in Chemistry

Chemical and Process Engineering

Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Chem. | doi: 10.3389/fchem.2019.00693

Synthesis and characterization of covalent triazine framework CTF-1@polysulfone mixed matrix membranes and their gas separation studies

 Christoph Janiak1*, Subarna Dey1,  Stefanie Bügel1, Sara Sorribas2, Alexander Nuhnen1,  Asamanjoy Bhunia1 and  Joaquin Coronas2
  • 1Heinrich Heine University of Düsseldorf, Germany
  • 2Instituto de Ciencia de Materiales de Aragón (ICMA), Spain

Covalent triazine framework CTF-1 and polysulfone (PSF) are used to form mixed-matrix membranes (MMMs) with 8 wt%, 16 wt% and 24 wt% of the porous filler material CTF-1. Studies on permeability and selectivity are carried out concerning the gases O2, N2, CO2 and CH4. CO2 permeability of the synthesized MMMs increases by 5.4 Barrer in comparison to the pure PSF membrane. The selectivity remains unchanged for O2/N2 and CO2/CH4 but was found to be increased for CO2/N2. Further, comparisons to theoretical models for permeability prediction yield a permeability for CTF-1 which is about six times higher than the permeability of PSF. The inverse of the sum of the free fractional volumes (FFV) of the polymer and the filler correlate linearly to the logarithm of the permeabilities of the gases which conversely indicates that the porosity of the filler contributes to the gas transport through the membrane.

Keywords: Mixed-matrix membrane (MMM), Gas selectivity, free fractional volume, Covalent triazine framework (CTF), Polysulfone (PSf)

Received: 09 Aug 2019; Accepted: 07 Oct 2019.

Copyright: © 2019 Janiak, Dey, Bügel, Sorribas, Nuhnen, Bhunia and Coronas. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mx. Christoph Janiak, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany, janiak@hhu.de