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

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    Type
    Article
    Authors
    Akhtar, Faheem cc
    Kumar, Mahendra cc
    Villalobos, Luis Francisco cc
    Shevate, Rahul
    Vovusha, Hakkim
    Schwingenschlögl, Udo cc
    Peinemann, Klaus-Viktor cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Chemical 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
    2017-09-13
    Permanent link to this record
    http://hdl.handle.net/10754/625501
    
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    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.
    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. A
    DOI
    10.1039/c7ta05081j
    Additional Links
    http://pubs.rsc.org/en/Content/ArticleLanding/2017/TA/C7TA05081J#!divAbstract
    ae974a485f413a2113503eed53cd6c53
    10.1039/c7ta05081j
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Material Science and Engineering Program; Computational Physics and Materials Science (CPMS); Water Desalination and Reuse Research Center (WDRC)

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