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  • Underwater microplasma bubbles for efficient and simultaneous degradation of mixed dye pollutants

    Author(s)
    Zhou, R
    Zhang, T
    Zhou, R
    Mai-Prochnow, A
    Ponraj, SB
    Fang, Z
    Masood, H
    Kananagh, J
    McClure, D
    Alam, D
    Ostrikov, K
    Cullen, PJ
    Griffith University Author(s)
    Ostrikov, Kostya (Ken)
    Year published
    2021
    Metadata
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    Abstract
    Complete degradation of mixtures of organic pollutants is a major challenge due to their diverse degradation pathways. In this work, a novel microplasma bubble (MPB) reactor was developed to generate plasma discharges inside small forming bubbles as an effective mean of delivering reactive species for the degradation of the target organic contaminants. The results show that the integration of plasma and bubbles resulted in efficient degradation for all azo, heterocyclic, and cationic dyes, evidenced by the outstanding energy efficiency of 13.0, 18.1 and 22.1 g/kWh with 3 min of processing, in degrading alizarin yellow (AY), ...
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    Complete degradation of mixtures of organic pollutants is a major challenge due to their diverse degradation pathways. In this work, a novel microplasma bubble (MPB) reactor was developed to generate plasma discharges inside small forming bubbles as an effective mean of delivering reactive species for the degradation of the target organic contaminants. The results show that the integration of plasma and bubbles resulted in efficient degradation for all azo, heterocyclic, and cationic dyes, evidenced by the outstanding energy efficiency of 13.0, 18.1 and 22.1 g/kWh with 3 min of processing, in degrading alizarin yellow (AY), orange II (Orng-II) and methylene blue (MB), individually. The MPB treatment also effectively and simultaneously degraded the dyes in their mixtures such as AY + Orng-II, AY + MB and AY + Orng-II + MB. Scavenger assays revealed that the short-lived reactive species, including the hydroxyl (radical dotOH) and superoxide anion (radical dotO2−) radicals, played the dominant role in the degradation of the pollutants. Possible degradation pathways were proposed based on the intermediate products detected during the degradation process. The feasibility of this proposed strategy was further evaluated using other common water pollutants. Reduced toxicity was confirmed by the observed increases in human cell viability for the treated water. This work could support the future development of high performance- and energy-efficient wastewater abatement technologies.
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    Journal Title
    Science of the Total Environment
    Volume
    750
    DOI
    https://doi.org/10.1016/j.scitotenv.2020.142295
    Subject
    Environmental Sciences
    Organic dyes
    Plasma-liquid interaction
    Reactive oxygen species
    Underwater microplasma bubbles
    Publication URI
    http://hdl.handle.net/10072/400775
    Collection
    • Journal articles

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