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    Efficient cesium encapsulation from contaminated water by cellulosic biomass based activated wood charcoal

    Access Status
    Fulltext not available
    Authors
    Khandaker, S.
    Chowdhury, M.F.
    Awual, Rabiul
    Islam, A.
    Kuba, T.
    Date
    2021
    Type
    Journal Article
    
    Metadata
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    Citation
    Khandaker, S. and Chowdhury, M.F. and Awual, M.R. and Islam, A. and Kuba, T. 2021. Efficient cesium encapsulation from contaminated water by cellulosic biomass based activated wood charcoal. Chemosphere. 262: Article No. 127801.
    Source Title
    Chemosphere
    DOI
    10.1016/j.chemosphere.2020.127801
    ISSN
    0045-6535
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/88602
    Collection
    • Curtin Research Publications
    Abstract

    In this study, cost-effective cellulosic biomass based activated wood charcoal was developed from Japanese Sugi tree (Cryptomeria japonica) by concentrated nitric acid modification for adsorption of Cs from contaminated water. The physicochemical properties of specimens were investigated using N2 adsorption-desorption isotherms (BET method), FESEM, FTIR, and XPS spectra analysis. The experimental results revealed that the surface area of the raw wood charcoal was significantly decreased after boiling nitric acid modification. However, several oxygen-containing acidic function groups (-COOH, –C[dbnd]O) were introduced on the surface. The adsorption study confirmed that the equilibrium contact time was 1 h, the optimum adsorption pH was neutral to alkaline and the suitable adsorbent dose was 1:100 (solid: liquid). The maximum Cs was removed when the concentration of Na and K were lower (5.0 mM) with Cs in solution. The Cs adsorption processes well approved by the Langmuir isotherm and pseudo-second-order kinetic models and the maximum adsorption capacity was 35.46 mgg−1. The Cs adsorption mechanism was clearly described and it was assumed that the adsorption was strongly followed by chemisorptions mechanism based on the adsorbent surface properties, kinetic model and Langmuir isotherm model. Most importantly, about 98% of volume reduction was obtained by burning (500 °C) the Cs adsorbed charcoal, which ensured safe storage and disposal of radioactive waste. Therefore, this study can offer a guideline to produce a functional adsorbent for effective Cs removal and safe radioactive waste disposal.

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