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Efficient Wastewater Remediation Enabled by Self-Assembled Perovskite Oxide Heterostructures with Multiple Reaction Pathways

  • Ming Zhu
    Ming Zhu
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, P.R. China
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  • Jie Miao
    Jie Miao
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, P.R. China
    More by Jie Miao
  • Daqin Guan
    Daqin Guan
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, P.R. China
    More by Daqin Guan
  • Yijun Zhong
    Yijun Zhong
    WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
    More by Yijun Zhong
  • Ran Ran
    Ran Ran
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, P.R. China
    More by Ran Ran
  • Shaobin Wang
    Shaobin Wang
    School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
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  • Wei Zhou*
    Wei Zhou
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, P.R. China
    *Email: [email protected]
    More by Wei Zhou
  • , and 
  • Zongping Shao*
    Zongping Shao
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing 211816, P.R. China
    WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
    *Email: [email protected]
Cite this: ACS Sustainable Chem. Eng. 2020, 8, 15, 6033–6042
Publication Date (Web):March 27, 2020
https://doi.org/10.1021/acssuschemeng.0c00882
Copyright © 2020 American Chemical Society
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Abstract

Advanced oxidation processes (AOPs) are promising for the removal of retardant organic pollutants in water. However, traditional free-radicals-dominated AOPs are often limited by poor tolerance to water characteristics. Recently, creating nonradical processes has been considered as an effective strategy to overcome this limitation, while the function and mechanism of nonradical processes are still unclear in the important oxides catalytic systems. Herein, the nonradical-dominated peroxymonosulfate (PMS)-based AOPs are triggered on a heterostructural perovskite nanocomposite catalyst (La0.4Sr1.05MnO4−δ), which is constructed from single and Ruddlesden–Popper perovskite phases by a facile self-assembled synthesis method. Noticeably, the phenol degradation rate of the heterostructural nanocomposite oxide is ∼2 times that of its individual components. This activity enhancement can be attributed to the abundant active oxygen vacancies, strong affinity to the reactants, and high-electron-transfer efficiency in the unique heterointerface of the nanocomposite. Furthermore, a ternary mechanism is unveiled: contaminants are oxidized not only by the function of radicals and singlet oxygen evoked from the active sites of perovskites but also by the transfer of their electrons to PMS via the beneficial surface of a heterostructral catalyst. This study provides new insights into nonradical-based AOPs derived from hybrid metal oxides in a PMS system.

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  • Figures of Raman patterns, SEM images, XRD patterns, H2-TPR profiles, quenching tests, IT curves, different organics utilized as chemical probes, effects of initial pH, and effects of coexisting anions and tables of refined cell parameters and reliability factors, specific surface areas, leached ions concentrations, and valences of Mn (PDF)

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