Heterogenous Iron Oxide Assemblages for Use in Catalytic Ozonation: Reactivity, Kinetics, and Reaction Mechanism

Heterogeneous catalytic ozonation (HCO) has gained increasing attention as an effective process to remove refractory organic pollutants from industrial effluents. However, widespread application of HCO is still limited due to the typically low efficacy of catalysts used and matrix passivation effect...

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Bibliographic Details
Published in:Environmental science & technology 2023-11, Vol.57 (47), p.18636-18646
Main Authors: Kong, Xiangtong, Garg, Shikha, Mortazavi, Mahshid, Ma, Jinxing, Waite, T David
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysts
Chemical synthesis
Ferric hydroxide
Ferric oxide
Industrial applications
Industrial effluents
Industrial pollution
Industrial wastewater
Iron oxides
Mathematical analysis
Ozonation
Reaction kinetics
Reaction mechanisms
Robustness (mathematics)
Urea
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Summary:Heterogeneous catalytic ozonation (HCO) has gained increasing attention as an effective process to remove refractory organic pollutants from industrial effluents. However, widespread application of HCO is still limited due to the typically low efficacy of catalysts used and matrix passivation effects. To this end, we prepared an Al O -supported Fe catalyst with high reactivity via a facile urea-based heterogeneous precipitation method. Due to the nonsintering nature of the preparation method, a heterogeneous catalytic layer comprised of γ-FeOOH and α-Fe O is formed on the Al O support (termed NS-Fe-Al O ). On treatment of a real industrial effluent by HCO, the presence of NS-Fe-Al O increased the removal of organics by ∼100% compared to that achieved with a control catalyst (i.e., α-Fe O /Al O or γ-FeOOH/Al O ) that was prepared by a conventional impregnation and calcination method. Furthermore, our results confirmed that the novel NS-Fe-Al O catalyst demonstrated resistance to the inhibitory effect of high concentration of chloride and sulfate ions usually present in industrial effluent. A mathematical kinetic model was developed that adequately describes the mechanism of HCO process in the presence of NS-Fe-Al O . Overall, the results presented here provide valuable guidance for the synthesis of effective and robust catalysts that will facilitate the wider industrial application of HCO.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.2c07319