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Chalcogenide Aerogels as Sorbents for Noble Gases (Xe, Kr)

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    Chalcogenide Aerogels as Sorbents for Noble Gases (Xe, Kr)
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    † Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
    ‡ Department of Chemistry, University of Crete, Voutes, 71003 Heraklion, Greece
    § Pacific Northwest National Laboratory, Richland, Washington 99352, United States
    *E-mail: [email protected]
    *E-mail: [email protected]
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2017, 9, 39, 33389–33394
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    https://doi.org/10.1021/acsami.6b15896
    Published February 3, 2017
    Copyright © 2017 American Chemical Society
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    Abstract

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    High-surface-area molybdenum sulfide (MoSx) and antimony sulfide (SbSx) chalcogels were studied for Xe/Kr gas separation. The intrinsic soft Lewis basic character of the chalcogel framework is a unique property among the large family of porous materials and lends itself to a potential new approach toward the selective separation of Xe over Kr. Among these chalcogels, MoSx shows the highest Xe and Kr uptake, reaching 0.69 mmol g–1 (1.05 mmol cm–3) and 0.28 mmol g–1 (0.42 mmol cm–3) respectively, at 273 K and 1 bar. The corresponding isosteric heat of adsorption at zero coverage (Qst0) is 22.8 and 18.6 kJ mol–1 and both are the highest among the selected chalcogels. The IAST (10:90) Xe/Kr selectivity at 273 K for MoSx is 6.0, whereas for SbSx chalcogels, it varies in the range 2.0–2.8. The higher formal charge of molybdenum, Mo4+, in MoSx versus that of antimony, Sb3+, in SbSx coupled with its larger atomic size could induce higher polarizability in the MoSx framework and therefore higher Xe/Kr selectivity.

    Copyright © 2017 American Chemical Society

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2017, 9, 39, 33389–33394
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.6b15896
    Published February 3, 2017
    Copyright © 2017 American Chemical Society
    Request reuse permissions

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