Plasmon-enhanced Catalytic Ozonation for Efficient Removal of Recalcitrant Water Pollutants

  • Wenwen Yang
    Wenwen Yang
    Department of Civil and Environmental Engineering, The University of Alabama in Huntsville, Huntsville 35899, Alabama, United States
    More by Wenwen Yang
  • Muntaseer Bunian
    Muntaseer Bunian
    Department of Chemical and Materials Engineering, The University of Alabama in Huntsville, Huntsville 35899, Alabama, United States
  • Xiankun Chen
    Xiankun Chen
    Department of Civil and Environmental Engineering, The University of Alabama in Huntsville, Huntsville 35899, Alabama, United States
    More by Xiankun Chen
  • Steve Heald
    Steve Heald
    X-ray Science Division, Argonne National Laboratory, Lemont 60439, Illinois, United States
    More by Steve Heald
  • Lei Yu
    Lei Yu
    Center for Nanoscale Materials, Argonne National Laboratory, Lemont 60439, Illinois, United States
    More by Lei Yu
  • Jianguo Wen
    Jianguo Wen
    Center for Nanoscale Materials, Argonne National Laboratory, Lemont 60439, Illinois, United States
    More by Jianguo Wen
  • Yu Lei*
    Yu Lei
    Department of Chemical and Materials Engineering, The University of Alabama in Huntsville, Huntsville 35899, Alabama, United States
    *Email: [email protected] (Y.L.)
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  • , and 
  • Tingting Wu*
    Tingting Wu
    Department of Civil and Environmental Engineering, The University of Alabama in Huntsville, Huntsville 35899, Alabama, United States
    *Email: Ti[email protected] (T.W.)
    More by Tingting Wu
Cite this: ACS EST Engg. 2021, 1, 5, 874–883
Publication Date (Web):March 23, 2021
https://doi.org/10.1021/acsestengg.1c00020
Copyright © 2021 American Chemical Society
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Abstract

Ag-Doped MnFe2O4 catalyst (Ag/MnFe2O4) was synthesized by a simple sol–gel method followed by H2 reduction. Utilizing the localized surface plasmon resonance (LSPR) of Ag, ∼35-fold and ∼7-fold degradation rate increases for a representative ozone-resistant water pollutant (atrazine) were achieved with a low photon flux (∼10–10 Einstein L–1), as compared to ozonation and catalytic ozonation, respectively, which also outperformed the homogeneous peroxone (O3/H2O2) process. The plasmon-mediated enhancement was realized through energy transferred from plasmonic Ag nanostructures to ozone adsorptive sites during the LSPR decay, leading to an accelerated ozone decomposition and subsequent radical generation (e.g., ·OH, O2·, and 1O2) at both existing and newly activated catalytic active sites. Ag LSPR also helps maintain Ag0 in an oxidizing aqueous environment, which is crucial to sustain the high catalytic activity. Because of these plasmonic effects, more than 90% removal was achieved in tap water under realistic water treatment conditions.

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  • Catalyst synthesis and characterization, relevant analytical methods, and catalytic performance (PDF)

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