Polybenzimidazole-based mixed membranes with exceptional high water vapor permeability and selectivity

Faheem Akhtar, Mahendra Kumar, Luis Francisco Villalobos, Rahul Shevate, Hakkim Vovusha, Udo Schwingenschlögl, Klaus-Viktor Peinemann

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Polybenzimidazole (PBI), a thermal and chemically stable polymer, is commonly used to fabricate membranes for applications like hydrogen recovery at temperatures of more than 300 °C, fuel cells working in a highly acidic environment, and nanofiltration in aggressive solvents. This report shows for the first time use of PBI dense membranes for water vapor/gas separation applications. They showed an excellent selectivity and high water vapor permeability. Incorporation of inorganic hydrophilic titanium-based nano-fillers into the PBI matrix further increased the water vapor permeability and water vapor/N2 selectivity. The most selective mixed matrix membrane with 0.5 wt% loading of TiO2 nanotubes yielded a water vapor permeability of 6.8×104 Barrer and a H2O/N2 selectivity of 3.9×106. The most permeable membrane with 1 wt% loading of carboxylated TiO2 nanoparticles had a 7.1×104 Barrer water vapor permeability and a H2O/N2 selectivity of 3.1×106. The performance of these membranes in terms of water vapor transport and selectivity is among the highest reported ones. The remarkable ability of PBI to efficiently permeate water versus other gases opens the possibility to fabricate membranes for dehumidification of streams in harsh environments. This includes the removal of water from high temperature reaction mixtures to shift the equilibrium towards products.
Original languageEnglish (US)
Pages (from-to)21807-21819
Number of pages13
JournalJ. Mater. Chem. A
Volume5
Issue number41
DOIs
StatePublished - Sep 13 2017

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