Surface Functional Group Engineering of CeO2 Particles for Enhanced Phosphate Adsorption

  • Baile Wu
    Baile Wu
    Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
    More by Baile Wu
  •  and 
  • Irene M.C. Lo*
    Irene M.C. Lo
    Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
    Institute for Advanced Study, The Hong Kong University of Science and Technology, Hong Kong, China
    *Tel: (852) 23587157. Fax: (852) 23581534. Email: [email protected]
Cite this: Environ. Sci. Technol. 2020, 54, 7, 4601–4608
Publication Date (Web):March 17, 2020
https://doi.org/10.1021/acs.est.9b06812
Copyright © 2020 American Chemical Society
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Abstract

Surface functional groups play a dominating role in determining the adsorption performance of metal oxide particles. The ability to manipulate the surface functional groups is vital in designing an effective adsorbent for water decontamination. In this study, a facile method is proposed for tuning the amount of the surface hydroxyl groups of CeO2 particles. The volume of water added during the ethylene glycol-mediated solvothermal synthesis of CeO2 particles can be used to adjust the amount of surface hydroxyl groups. By simple reduction in the volume of water, the number of surface hydroxyl groups of CeO2 particles can be increased and the phosphate adsorption capacity can be greatly improved. Our results show that the obtained CeO2 particles have high phosphate adsorption capacity at low phosphate concentrations, fast adsorption kinetics, and the ability to achieve an ultralow phosphate concentration in the real sewage effluent. This study provides an effective strategy for designing highly effective metal oxide adsorbents through surface functional group engineering.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.est.9b06812.

  • XRD patterns and Raman spectra of CeO2 particles, FTIR spectra of CeO2 particles before and after phosphate adsorption, N2 adsorption–desorption isotherms of CeO2 particles, ζ potential of CeO2 particles as a function of pH, phosphate adsorption isotherms of CeO2 (20 mL H2O) particles, phosphate removal by CeO2 (No H2O) particles from treated sewage effluent, isotherm and kinetic parameters for phosphate adsorption by CeO2 particles using nonlinear optimization techniques, phosphate adsorption by cerium-based adsorbents, characteristics of treated sewage effluent samples used for phosphate removal by CeO2 particles (PDF)

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