High-Ionic-Strength wastewater treatment via catalytic wet oxidation over a MnCeOx catalyst

Xiaoxia Ou, Helen Daly, Xiaolei Fan, Simon Beaumont, Sarayute Chansai, Arthur Garforth, Shanshan Xu, Christopher Hardacre

Research output: Journal PublicationArticlepeer-review

Abstract

Catalytic wastewater treatment has rarely been applied to treat high-ionic-strength wastewater (HISWW) as it contains large amounts of catalyst poisons (e.g., Cl–). This work investigates the catalytic wet oxidation (CWO) of phenol over a MnCeOx catalyst in the presence of high NaCl concentrations where the combination of MnCeOx and NaCl promoted the CWO of phenol. Specifically, in the presence of NaCl at a concentration of 200 g L–1 and MnCeOx at a concentration of 1.0 g L–1, phenol (initially 1.0 g L–1) and total organic carbon (TOC) conversions were ∼98 and 85%, respectively, after a 24 h reaction. Conversely, under the same reaction conditions without NaCl, the catalytic system only achieved phenol and TOC conversions of ∼41 and 27%, respectively. In situ Attenuated Total Reflection infrared spectroscopy identified the nature of the strongly adsorbed carbon deposits with quinone/acid species found on Ce sites and phenolate species on Mn sites in the single oxides and on MnCeOx. The presence of high concentrations of NaCl reduced the carbon deposition over the catalyst, promoting surface oxidation of the hydrocarbon and reoxidation of the catalyst, resulting in enhanced mineralization. Moreover, the used MnCeOx catalyst in the salt water system was efficiently regenerated via a salt water wash under the reaction conditions, showing the great potential of MnCeOx in practical HISWW treatment.
Original languageEnglish
Pages (from-to)7598-7608
JournalACS Catalysis
Volume12
Early online date13 Jun 2022
DOIs
Publication statusPublished - 1 Jul 2022
Externally publishedYes

Keywords

  • high-ionic-strength wastewater treatment
  • phenol
  • catalytic wet oxidation (CWO)
  • MnCeOx
  • in situ ATR spectroscopy

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