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    Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping

    Access Status
    Fulltext not available
    Authors
    Wang, Y.
    Cao, H.
    Chen, C.
    Xie, Y.
    Sun, Hongqi
    Duan, Xiaoguang
    Wang, Shaobin
    Date
    2019
    Type
    Journal Article
    
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    Citation
    Wang, Y. and Cao, H. and Chen, C. and Xie, Y. and Sun, H. and Duan, X. and Wang, S. 2019. Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping. Chemical Engineering Journal. 355: pp. 118-129.
    Source Title
    Chemical Engineering Journal
    DOI
    10.1016/j.cej.2018.08.134
    ISSN
    1385-8947
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/71378
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier B.V. N-doped graphene has demonstrated exceptional activities in versatile metal-free catalytic processes. In this study, reduced graphene oxide (rGO) and N-doped rGO were synthesized by a facile approach via microwave reduction with a low energy input and short reaction time. The activities of the derived carbocatalysts were evaluated by catalytic ozonation of 4-nitrophenol (4-NP). Compared with thermally annealed rGOs in argon atmosphere, microwave treated rGO demonstrated a better performance in catalytic oxidation, and N-doping would further improve the catalytic activity. It is discovered that microwave irradiation not only gave rise to more edging sites and dangling bonds in rGO, making higher catalytic potentials for ozone decomposition than that from thermal annealing, but also resulted in a higher concentration of N dopants. XPS studies revealed that more graphitic N species were incorporated into the carbon basal plane during the microwave reduction processes. The reactive oxygen species (ROS) in 4-NP oxidation were evaluated and identified by liquid-phase electron spin resonance (ESR) and radical scavenging tests, which indicated the generation of O2[rad]-, [rad]OH and1O2for 4-NP degradation. This study provides a facile protocol for fabricating advanced nanocarbon materials for green oxidation and enables new insights in catalytic ozonation with state-of-the-art carbocatalysis.

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