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  • Hydrogenated hematite nanoplates for enhanced photocatalytic and photo-Fenton oxidation of organic compounds

    Author(s)
    Zheng, Mengting
    Xing, Chao
    Zhang, Weiping
    Cheng, Zhiliang
    Liu, Xianhu
    Zhang, Shanqing
    Griffith University Author(s)
    Zhang, Shanqing
    Xing, Chao
    Zheng, Mengting
    Zhang, Weiping
    Cheng, Zhiliang
    Year published
    2020
    Metadata
    Show full item record
    Abstract
    Hematite (α-Fe2O3) has been widely used as a photocatalyst for photo-Fenton oxidation due to its low cost, environmental friendliness, and high efficiency. The Photo-Fenton oxidation performance can be improved for practical applications via bandgap engineering of the photocatalyst. Herein, hematite nanoplate (HNP) is synthesized via a solvothermal method and a hydrogenation treatment, resulting in hydrogenated HNP (H-HNP). Materials characterizations demonstrate the even distribution of oxygen vacancies, formation of Fe (II) species on H-HNP, the enhanced light absorption, and separation of photogenerated e−/h+ pairs. Under ...
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    Hematite (α-Fe2O3) has been widely used as a photocatalyst for photo-Fenton oxidation due to its low cost, environmental friendliness, and high efficiency. The Photo-Fenton oxidation performance can be improved for practical applications via bandgap engineering of the photocatalyst. Herein, hematite nanoplate (HNP) is synthesized via a solvothermal method and a hydrogenation treatment, resulting in hydrogenated HNP (H-HNP). Materials characterizations demonstrate the even distribution of oxygen vacancies, formation of Fe (II) species on H-HNP, the enhanced light absorption, and separation of photogenerated e−/h+ pairs. Under simulated solar light, in comparison with pristine HNP, the H-HNP delivered significantly higher photo-Fenton oxidation activities under near-neutral pH conditions for the degradation of 50 mg L−1 Rhodamine B, Congo red, and Methylene blue after 20 min, i.e., 92.7%, 98.2%, and 77.2%, respectively. Mechanistic explorations, including XPS and radical trapping analysis, suggest that positively charged holes (h+) and catalytically formed hydroxyl radicals ([rad]OH) were the main factors contributing to the higher photo-Fenton oxidation performance of H-HNP. Overall, hydrogenation treatment is an easy and effective means for bandgap engineering to improve the photocatalytic performance of photocatalysts as demonstrated by the as-prepared H-HNP as a high-performance photocatalyst for the photo-Fenton oxidation reaction.
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    Journal Title
    Inorganic Chemistry Communications
    Volume
    119
    DOI
    https://doi.org/10.1016/j.inoche.2020.108040
    Subject
    Inorganic Chemistry
    Other Chemical Sciences
    Science & Technology
    Physical Sciences
    Chemistry, Inorganic & Nuclear
    Hydrogenation
    Publication URI
    http://hdl.handle.net/10072/400418
    Collection
    • Journal articles

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