University of Oulu

Tero Luukkonen, Urs von Gunten, Oxidation of organic micropollutant surrogate functional groups with peracetic acid activated by aqueous Co(II), Cu(II), or Ag(I) and geopolymer-supported Co(II), Water Research, Volume 223, 2022, 118984, ISSN 0043-1354, https://doi.org/10.1016/j.watres.2022.118984

Oxidation of organic micropollutant surrogate functional groups with peracetic acid activated by aqueous Co(II), Cu(II), or Ag(I) and geopolymer-supported Co(II)

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Author: Luukkonen, Tero1,2; von Gunten, Urs2,3
Organizations: 1University of Oulu, Fibre and Particle Engineering Research Unit, P.O. Box 8000, FI-90014, Finland
2Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, Dübendorf CH-8600, Switzerland
3School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Lausanne (EPFL), Lausanne 1015, Switzerland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2022082456069
Language: English
Published: Elsevier, 2022
Publish Date: 2022-08-24
Description:

Abstract

Peracetic acid (PAA) in combination with transition metals has recently gained increasing attention for organic micropollutant abatement. In this study, aqueous Co(II), Cu(II), and Ag(I) were compared for their capacity to activate PAA. Co(II) outperformed Cu(II) or Ag(I) and the optimum conditions were 0.05 mM of Co(II), 0.4 mM of PAA, and pH 3. However, due to a wider applicability in water treatment, pH 7 (i.e., bicarbonate buffer) was selected for detailed investigations. The abatement of different micropollutant surrogates could be described with a second-order rate equation (observed second-order rate constants, kobs were in the range of 42–132 M⁻¹ s⁻¹). For the para-substituted phenols, there was a correlation between the observed second-order rate constants of the corresponding phenolates and the Hammett constants (R² = 0.949). In all oxidation experiments, the reaction rate decreased significantly after 1–2 min, which coincided with the depletion of PAA but also with the deactivation of the Co(II) catalyst by oxidation to Co(III) and subsequent precipitation. It was demonstrated that Co(II) immobilized on a geopolymer-foam performed approximately similarly as aqueous Co(II) but without deactivation due to Co(III) precipitation. This provides a potential option for the further development of heterogeneous catalytic Co(II)/PAA advanced oxidation processes utilizing geopolymers as a catalyst support material.

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Series: Water research
ISSN: 0043-1354
ISSN-E: 1879-2448
ISSN-L: 0043-1354
Volume: 223
Article number: 118984
DOI: 10.1016/j.watres.2022.118984
OADOI: https://oadoi.org/10.1016/j.watres.2022.118984
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
215 Chemical engineering
216 Materials engineering
218 Environmental engineering
Subjects:
Funding: This study was supported by the Academy of Finland (grants #315103 and #326291).
Academy of Finland Grant Number: 315103
Detailed Information: 315103 (Academy of Finland Funding decision)
Copyright information: © 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/