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    Tailored synthesis of active reduced graphene oxides from waste graphite: Structural defects and pollutant-dependent reactive radicals in aqueous organics decontamination

    264517.pdf (1.248Mb)
    Access Status
    Open access
    Authors
    Wang, Y.
    Cao, H.
    Chen, L.
    Chen, C.
    Duan, Xiaoguang
    Xie, Y.
    Song, W.
    Sun, Hongqi
    Wang, Shaobin
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wang, Y. and Cao, H. and Chen, L. and Chen, C. and Duan, X. and Xie, Y. and Song, W. et al. 2018. Tailored synthesis of active reduced graphene oxides from waste graphite: Structural defects and pollutant-dependent reactive radicals in aqueous organics decontamination. Applied Catalysis B: Environmental. 229: pp. 71-80.
    Source Title
    Applied Catalysis B: Environmental
    DOI
    10.1016/j.apcatb.2018.02.010
    ISSN
    0926-3373
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/66459
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier B.V. Anode graphite was recovered from a spent lithium ion battery (LIB) and reutilized as a carbon precursor to obtain graphene-based materials. Characterization results revealed that impurities were removed from the obtained graphite powder by cleansing processes. The as-synthesized reduced graphene oxide (rGO) from the purified graphite (LIB-rGO) demonstrated excellent catalytic ozonation activity against organic pollutants removal. To probe potential catalytic active sites, LIB-rGOs with different defective levels but similar oxygen contents were synthesized. Catalytic ozonation tests revealed that a higher defective level resulted in a greater catalytic activity. Density functional theory (DFT) calculation further demonstrated that ozone molecules could spontaneously decompose into active oxygen species on graphene structural vacancies and edges, which consolidated the role of defective structure in catalytic ozonation activity. Meanwhile, we discovered the pollutant-structure-dependent behavior of dominant reactive oxygen species (ROS) with the aid of radical scavenging tests and electron paramagnetic resonance (EPR) spectra. For phenolic pollutants vulnerable to direct ozone attacking, superoxide radicals (O 2 [rad] - ) and singlet oxygen ( 1 O 2 ) were found to be responsible ROS, whereas hydroxyl radicals ([rad]OH) were identified as the principle ROS for aliphatic organic pollutants destruction. This study not only put forward a possible way for reutilization of waste LIB anode, but also stepped further for investigating the catalytic ozonation mechanism towards the graphene-based materials including the active sites and the generation of ROS.

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