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High-Ionic-Strength Wastewater Treatment via Catalytic Wet Oxidation over a MnCeOx Catalyst

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

High-Ionic-Strength Wastewater Treatment via Catalytic Wet Oxidation over a MnCeOx Catalyst Thumbnail


Authors

Xiaoxia Ou

Helen Daly

Xiaolei Fan

Sarayute Chansai

Arthur Garforth

Shanshan Xu

Christopher Hardacre



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.

Citation

Ou, X., Daly, H., Fan, X., Beaumont, S. K., Chansai, S., Garforth, A., …Hardacre, C. (2022). High-Ionic-Strength Wastewater Treatment via Catalytic Wet Oxidation over a MnCeOx Catalyst. ACS Catalysis, 12(13), 7598-7608. https://doi.org/10.1021/acscatal.2c01952

Journal Article Type Article
Acceptance Date Jun 1, 2022
Online Publication Date Jun 13, 2022
Publication Date 2022
Deposit Date Jul 1, 2022
Publicly Available Date Jul 1, 2022
Journal ACS Catalysis
Electronic ISSN 2155-5435
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 12
Issue 13
Pages 7598-7608
DOI https://doi.org/10.1021/acscatal.2c01952

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