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  • Plasmacatalytic bubbles using CeO2 for organic pollutant degradation

    Author(s)
    Zhou, Renwu
    Zhou, Rusen
    Alam, David
    Zhang, Tianqi
    Li, Wenshao
    Xia, Yang
    Mai-Prochnow, Anne
    An, Hongjie
    Lovell, Emma C
    Masood, Hassan
    Amal, Rose
    Ostrikov, Kostya Ken
    Cullen, Patrick J
    Griffith University Author(s)
    An, Hongjie
    Year published
    2021
    Metadata
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    Abstract
    Interactions between effects generated by non-thermal plasma (NTP) and catalysts are increasingly investigated, ranging from energy conversion and material synthesis to pollutant degradation (e.g. volatile organic compounds, VOCs) and water purification. To make the water ecosystem more environmentally and economically sustainable, green and efficient wastewater treatment technologies are urgently required. In this study, a plasmacatalytic bubble column reactor was designed to generate underwater plasma bubbles (PBs) for efficient delivery of plasma-produced gaseous reactive oxidative species to the liquid phase for subsequent ...
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    Interactions between effects generated by non-thermal plasma (NTP) and catalysts are increasingly investigated, ranging from energy conversion and material synthesis to pollutant degradation (e.g. volatile organic compounds, VOCs) and water purification. To make the water ecosystem more environmentally and economically sustainable, green and efficient wastewater treatment technologies are urgently required. In this study, a plasmacatalytic bubble column reactor was designed to generate underwater plasma bubbles (PBs) for efficient delivery of plasma-produced gaseous reactive oxidative species to the liquid phase for subsequent applications. This system shows great potential for degrading a stubborn water contaminant azophloxine (AP), which was further enhanced with an addition of CeO2 catalysts, resulting in the catalytic oxidation of the azo dyes. Moreover, the performances and durability of CeO2 were further improved via plasma pre-activation. The plasma-treated CeO2 (CeO2-P) displayed a combination of favourable properties, such as a higher concentration of oxygen vacancies and Ce3+ (observed by XPS), a narrowed energy bandgap, and an increased specific surface area (by 41.39%). Compared with the sole PBs and PBs/CeO2 systems, the highest removal efficiency and kinetic constant up to 99.5% and 0.907 min−1, respectively, were achieved in the PBs/CeO2-P system. Reactive species trapping corroborated that ·OH and ·O2– played an integral part in AP degradation. Finally, intermediates in the process of AP degradation were identified and a degradation pathway was proposed. This research would offer a promising remediation methodology for water purification via the integration of underwater plasma bubbles and CeO2 catalysts.
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    Journal Title
    Chemical Engineering Journal
    Volume
    403
    DOI
    https://doi.org/10.1016/j.cej.2020.126413
    Subject
    Chemical engineering
    Civil engineering
    Environmental engineering
    Science & Technology
    Engineering
    Publication URI
    http://hdl.handle.net/10072/400789
    Collection
    • Journal articles

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