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    Static and dynamic adsorptive removal of selenite and selenate by alkoxide-free sol-gel-generated Mg-Al-CO3 layered double hydroxide: Effect of competing ions

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    Type
    Article
    Authors
    Chubar, Natalia
    Szlachta, Malgorzata
    KAUST Grant Number
    KUK-C1-017-12
    Date
    2015
    Permanent link to this record
    http://hdl.handle.net/10754/673042
    
    Metadata
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    Abstract
    Adsorption/ion exchange is a major separation approach capable of recovering the valuable Se component from various multicomponent solutions or to reduce its concentration. In this study, we report a method for selenite and selenate adsorptive removal based on the application of Mg-Al-CO<inf>3</inf> layered double hydroxide (LDH) generated via an alkoxide-free sol-gel synthesis method developed by the authors. The selenite and selenate removal capability of Mg-Al LDH was examined under static and dynamic adsorption conditions, focusing on the influence of the competing anions (phosphate, sulphate, carbonate, silicate, chloride). The adsorption capacities of Mg-Al LDH for selenite and selenate obtained from the equilibrium isotherms were not influenced by the presence of the competing sulphate, retaining the highest values of 168 and 103mg [Se]/g<inf>dw</inf> for Se(IV) and Se(VI) at pH 5, respectively. This inorganic ion exchanger is capable of functioning across the broad range of pH values from 5 to 9. Mg-Al LDH could purify 16,200 and 4200 bed volumes (BVs) of the selenite/selenate-containing solutions (~50μg [Se]/L initial concentration), respectively, until reaching a selenium concentration of zero in the effluents. The presence of phosphate and a 74-times higher concentration of sulphate compared with selenate or selenite in the adsorbate showed nearly no influence on the dynamic adsorptive performance of Mg-Al LDH for selenite. An equivalent concentration of phosphate did not influence the dynamic adsorptive removal of selenate. Markedly higher concentrations of sulphate, however, decreased the time to breakthrough for selenate but did not affect the quality of its removal. Mg-Al LDH is a promising inorganic ion exchanger for the removal of both of the aqueous selenium species and will be tested on industrial scales.
    Citation
    Chubar, N., & Szlachta, M. (2015). Static and dynamic adsorptive removal of selenite and selenate by alkoxide-free sol–gel-generated Mg–Al–CO 3 layered double hydroxide: Effect of competing ions. Chemical Engineering Journal, 279, 885–896. doi:10.1016/j.cej.2015.05.070
    Sponsors
    This work was funded by King Abdullah University of Science and Technology (KAUST) through a Centre-in-Development award No KUK-C1-017-12. The authors are grateful to the anonymous Reviewers and Editor who helped to improve this work.
    Publisher
    ELSEVIER SCIENCE SA
    Journal
    CHEMICAL ENGINEERING JOURNAL
    DOI
    10.1016/j.cej.2015.05.070
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1385894715007585
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.cej.2015.05.070
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