Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Role of oxygen vacancies and Mn sites in hierarchical Mn2O3/LaMnO3-δ perovskite composites for aqueous organic pollutants decontamination

    Access Status
    Fulltext not available
    Authors
    Wang, Y.
    Chen, L.
    Cao, H.
    Chi, Z.
    Chen, C.
    Duan, Xiaoguang
    Xie, Y.
    Qi, F.
    Song, W.
    Liu, J.
    Wang, Shaobin
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wang, Y. and Chen, L. and Cao, H. and Chi, Z. and Chen, C. and Duan, X. and Xie, Y. et al. 2019. Role of oxygen vacancies and Mn sites in hierarchical Mn2O3/LaMnO3-δ perovskite composites for aqueous organic pollutants decontamination. Applied Catalysis B: Environmental. 245: pp. 546-554.
    Source Title
    Applied Catalysis B: Environmental
    DOI
    10.1016/j.apcatb.2019.01.025
    ISSN
    0926-3373
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/73789
    Collection
    • Curtin Research Publications
    Abstract

    La-based perovskites are catalytically active owing to the oxygen vacancies, redox metal centers of B sites and surface hydroxyl groups. Nevertheless, the insights into these active centers on environmental catalysis are still insufficient. In this study, hierarchical mixed oxides perovskite microspheres were synthesized for catalytic ozonation over oxalic acid and benzotriazole. LaMn4Ox, with LaMnO3-d as the dominant crystal phase, demonstrated superior catalytic activity to Mn2O3 and LaMnO3 synthesized from citric acid sol-gel method. Temperature-programmed desorption of NH3 (NH3-TPD) and pyridine-Fourier transform infrared spectroscopy (pyridine-FTIR) tests proved Lewis acid as the main acid type. Temperature-programmed reduction of H2 (H2-TPR), O2-TPD and X-ray photoelectron spectroscopy (XPS) analysis indicated the presence of oxygen vacancies and mixed valences of Mn in the crystal structure facilitated the catalytic process. Moreover, the content of oxygen vacancy was calculated by iodometric titration method. With the aid of theoretical calculations, oxygen vacancies were found to exhibit a strong affinity toward ozone adsorption, where ozone molecules spontaneously dissociated into reactive oxygen species (ROS) such as O2[rad]- and 1O2. The B site of Mn facilitated ozone decomposition by extending the O–O bond of ozone due to the electron transfer from Mn3+/Mn4+ redox cycle. In-situ EPR and quenching tests confirmed the contribution of O2[rad]- and 1O2 in benzotriazole degradation along with [rad]OH. This study stepped further to unveil the ozone adsorption/decomposition and ROS generation on nanoscale perovskite-based composites.

    Related items

    Showing items related by title, author, creator and subject.

    • Tailored synthesis of active reduced graphene oxides from waste graphite: Structural defects and pollutant-dependent reactive radicals in aqueous organics decontamination
      Wang, Y.; Cao, H.; Chen, L.; Chen, C.; Duan, Xiaoguang; Xie, Y.; Song, W.; Sun, Hongqi; Wang, Shaobin (2018)
      © 2018 Elsevier B.V. Anode graphite was recovered from a spent lithium ion battery (LIB) and reutilized as a carbon precursor to obtain graphene-based materials. Characterization results revealed that impurities were ...
    • Passivation of interstitial and vacancy mediated trap-states for efficient and stable triple-cation perovskite solar cells
      Mahmud, M.; Elumalai, Naveen Kumar; Upama, M.; Wang, D.; Gonçales, V.; Wright, M.; Xu, C.; Haque, F.; Uddin, A. (2018)
      The current work reports the concurrent passivation of interstitial and oxygen vacancy mediated defect states in low temperature processed ZnO electron transport layer (ETL) via Ultraviolet-Ozone (UVO) treatment for ...
    • Syngas production by catalytic partial oxidation of methane over (La0.7A0.3)BO3 (A = Ba, Ca, Mg, Sr, and B = Cr or Fe) perovskite oxides for portable fuel cell applications
      Khine, M.; Chen, L.; Zhang, S.; Lin, J.; Jiang, San Ping (2013)
      Hydrogen is a clean energy carrier for the future. More efficient, economic and small-scale syngas production has therefore important implications not only on the future sustainable hydrogen-based economy but also on the ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.