Synergistically Boosted Degradation of Organic Dyes by CeO2 Nanoparticles with Fluoride at Low pH

  • Yawen Wang*
    Yawen Wang
    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Department of Chemistry, Waterloo Institute for Nanotechnology, Water Institute, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
    *(Y.W.) E-mail: [email protected]
    More by Yawen Wang
  • Tongtong Liu
    Tongtong Liu
    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    More by Tongtong Liu
  • , and 
  • Juewen Liu*
    Juewen Liu
    Department of Chemistry, Waterloo Institute for Nanotechnology, Water Institute, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
    *(J.L.) E-mail: [email protected]
    More by Juewen Liu
Cite this: ACS Appl. Nano Mater. 2020, 3, 1, 842–849
Publication Date (Web):December 31, 2019
Copyright © 2019 American Chemical Society
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Catalysts that can work without the need of light and additional oxidants such as H2O2 to degrade organic pollutants have been long sought. In this work, we report that at acidic condition, CeO2 nanoparticles can effectively degrade various organic dyes such as rhodamine B, fluorescein, xylene cyanol FF, brilliant blue G-250, and coomassie brilliant blue R-250 in the presence of fluoride in dark. The degradation kinetics are fast, and F accelerates the reaction by at least 89-fold. Each gram of CeO2 can degrade 0.47 g of rhodamine B before the need of regeneration. Therefore, the synergistic effect of fluoride and acid drastically boosted degradation of organic dyes by CeO2 under ambient temperature. No other chemicals like H2O2, UV light, or ultrasonic treatment are required. By using UV–vis spectrometry and chemical oxygen demand analysis, the removal of rhodamine B proceeded by an initial fast partial degradation followed by a slower full degradation. In addition, the removal capacity, reusability, the effect of CeO2, acid and F were studied in detail. The mechanism of fluoride was attributed to the increased oxygen vacancy on CeO2, and a strong acidic environment further boosted this effect.

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  • TEM and EDX element mapping of CeO2, degradation kinetic of other dyes, additional control experiments for RhB degradation, CeO2 nanorods for RhB degradation, a standard curve for Ce4+ detection, ESR and EPR specra of CeO2 nanoparticles, RhB degradation of different nanoscale CeO2, comparation degradation effect on HF and phosphate treated CeO2, additional experimental methods (PDF)

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