Polybenzimidazole-based mixed membranes with exceptional high water vapor permeability and selectivity
Type
ArticleAuthors
Akhtar, Faheem
Kumar, Mahendra

Villalobos, Luis Francisco

Shevate, Rahul
Vovusha, Hakkim
Schwingenschlögl, Udo

Peinemann, Klaus-Viktor

KAUST Department
Advanced Membranes and Porous Materials Research CenterChemical Engineering Program
Computational Physics and Materials Science (CPMS)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Water Desalination and Reuse Research Center (WDRC)
Date
2017-09-13Permanent link to this record
http://hdl.handle.net/10754/625501
Metadata
Show full item recordAbstract
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.Citation
Akhtar FH, Kumar M, Villalobos LF, Shevate R, Vovusha H, et al. (2017) Polybenzimidazole-based mixed membranes with exceptional high water vapor permeability and selectivity. J Mater Chem A. Available: http://dx.doi.org/10.1039/c7ta05081j.Sponsors
The research reported in this publication was supported by the funding from King Abdullah University of Science and Technology (KAUST), Kingdom of Saudi Arabia.Publisher
Royal Society of Chemistry (RSC)Journal
J. Mater. Chem. Aae974a485f413a2113503eed53cd6c53
10.1039/c7ta05081j