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    Amine impregnated porous silica gel sorbents synthesized from water-glass precursors for CO2 capturing

    238690_238690.pdf (5.549Mb)
    Access Status
    Open access
    Authors
    Minju, N.
    Abhilash, P.
    Nair, Balagopal
    Mohamed, A.
    Ananthakumar, S.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Minju, N. and Abhilash, P. and Nair, B. and Mohamed, A. and Ananthakumar, S. 2015. Amine impregnated porous silica gel sorbents synthesized from water-glass precursors for CO2 capturing. Chemical Engineering Journal. 269: pp. 335-342.
    Source Title
    Chemical Engineering Journal
    DOI
    10.1016/j.cej.2015.01.069
    ISSN
    1385-8947
    School
    Nanochemistry Research Institute
    URI
    http://hdl.handle.net/20.500.11937/4322
    Collection
    • Curtin Research Publications
    Abstract

    In this work, porous silica gel-solid beads have been made from economically affordable water-glass precursors via sol-gel nano casting technique. A stable nanometric silica sol was prepared first from water glass and studied for surface potential and sol to gel transition. A free-flow, injectable gel was obtained upon aging the sol which was then assembled into spherical silica beads in a chemical bath. A surface area of 304.7m2g-1 was obtained for water glass derived silica gel beads. These gel beads were impregnated with 3-aminopropyltrimethoxysilane (APTMS) and polyethylenimine (PEI) active functional groups at different percentages for turning the gel beads as sorbents for CO2 gas adsorption. The effect of amine loading on the thermal stability, morphology as well as porosity was studied and was correlated with CO2 adsorption values. Depending upon the amount of amine loaded in the gel support CO2 uptake was found varied. These amine modified silica gel porous adsorbents showed CO2 adsorption capacity at temperatures as low as 100°C; samples modified with 15wt% PEI had CO2 adsorption capacity of 1.16mmolg-1 at 50°C. © 2015 Elsevier B.V.

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