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    Ni0encapsulated in N-doped carbon nanotubes for catalytic reduction of highly toxic hexavalent chromium

    Access Status
    Fulltext not available
    Authors
    Yao, Y.
    Zhang, J.
    Chen, H.
    Yu, M.
    Gao, M.
    Hu, Y.
    Wang, Shaobin
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Yao, Y. and Zhang, J. and Chen, H. and Yu, M. and Gao, M. and Hu, Y. and Wang, S. 2018. Ni0encapsulated in N-doped carbon nanotubes for catalytic reduction of highly toxic hexavalent chromium. Applied Surface Science. 440: pp. 421-431.
    Source Title
    Applied Surface Science
    DOI
    10.1016/j.apsusc.2018.01.123
    ISSN
    0169-4332
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150103026
    URI
    http://hdl.handle.net/20.500.11937/65503
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier B.V. N-doped carbon nanotubes encapsulating Ni 0 nanoparticles (Ni@N-C) were fabricated via thermal reduction of dicyandiamide and NiCl 2 ·6H 2 O, and used to remove Cr VI in polluted water. The resultant products present an excellent catalytic activity for Cr VI reduction using formic acid under relatively mild conditions. The Cr VI reduction efficiency of Ni@N-C was significantly affected by the preparation conditions including the mass of nickel salt and synthesis temperatures. The impacts of several reaction parameters, such as initial concentrations of Cr VI and formic acid, solution pH and temperatures, as well as inorganic anions in solution on Cr VI reduction efficiency were also evaluated in view of scalable industrial applications. Owing to the synergistic effects amongst tubes-coated Ni 0 , doped nitrogen, oxygen containing groups, and the configuration of carbon nanotubes, Ni@N-C catalysts exhibit excellent catalytic activity and recyclable capability for Cr VI reduction. Carbon shell can efficiently protect inner Ni 0 core and N species from corrosion and subsequent leaching, while Ni 0 endows the Ni@N-C catalysts with ferromagnetism, so that the composites can be easily separated via a permanent magnet. This study opens up an avenue for design of N-doped carbon nanotubes encapsulating Ni 0 nanoparticles with high Cr VI removal efficiency and magnetic recyclability as low-cost catalysts for industrial applications.

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