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  • Bifunctional Catalytic Cooperativity on Nanoedge: Oriented Ce-Fe Bimetallic Fenton Electrocatalysts for Organic Pollutant Control

    Author(s)
    Liu, Ying
    Yang, Yulin
    Miao, Wei
    Du, Ningjie
    Wang, Dandan
    Qin, Hehe
    Mao, Shun
    Ostrikov, Kostya Ken
    Griffith University Author(s)
    Ostrikov, Ken
    Year published
    2021
    Metadata
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    Abstract
    Electro-Fenton (EF) is one of the promising clean and renewable technologies for organic pollutant control. However, insufficient hydrogen peroxide (H2O2) generation and the subsequent hydroxyl radicals (•OH) conversion still prevent the wide applications of EF. Herein, we report a Ce-doped vertically aligned α-FeOOH nanoflakes anchored on a carbon felt (CF) cathode for EF operation. In this system, a high concentration H2O2 (113.6 mg/L on 4 cm2 cathode) is generated in 60 min, and being efficiently catalyzed to •OH by virtue of the active nanoedge (1.6 nm thickness) of Ce-doped α-FeOOH. The •OH production rate is calculated ...
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    Electro-Fenton (EF) is one of the promising clean and renewable technologies for organic pollutant control. However, insufficient hydrogen peroxide (H2O2) generation and the subsequent hydroxyl radicals (•OH) conversion still prevent the wide applications of EF. Herein, we report a Ce-doped vertically aligned α-FeOOH nanoflakes anchored on a carbon felt (CF) cathode for EF operation. In this system, a high concentration H2O2 (113.6 mg/L on 4 cm2 cathode) is generated in 60 min, and being efficiently catalyzed to •OH by virtue of the active nanoedge (1.6 nm thickness) of Ce-doped α-FeOOH. The •OH production rate is calculated as high as 4.2 mM/W/cm2/min, which is ∼6.6-fold higher compared with the unmodified CF electrode. Moreover, this novel cathode achieves a complete removal (100% removal rate) of ultrahigh concentration chloramphenicol (1.1 mM, 355 mg/L) in 8 h and a high mineralization rate (94%) in 29 h in a scaled-up EF system. Density functional theory calculations (DFT) reveal that the Ce doping in α-FeOOH greatly promotes the conversion of H2O2 into •OH. This study not only offers a novel cathode structure for EF process but also opens radically new prospects for applied environmental catalysis.
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    Journal Title
    ACS ES&T Engineering
    Volume
    1
    Issue
    12
    DOI
    https://doi.org/10.1021/acsestengg.1c00149
    Subject
    Environmental engineering
    Science & Technology
    Technology
    Engineering, Environmental
    Engineering
    electro-Fenton
    Publication URI
    http://hdl.handle.net/10072/411503
    Collection
    • Journal articles

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