DOM optical parameters as a tool to understand degradation of phenolic contaminants of emerging concern.

Autor: Sanei E; School of Engineering and Technology, Central Michigan University, 1200 S Franklin St, Mt Pleasant, MI, 48859, USA., Marquez I; School of Engineering and Technology, Central Michigan University, 1200 S Franklin St, Mt Pleasant, MI, 48859, USA. Electronic address: itzel1l@cmich.edu.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2023 Nov; Vol. 340, pp. 139750. Date of Electronic Publication: 2023 Aug 11.
DOI: 10.1016/j.chemosphere.2023.139750
Abstrakt: Composition and source of dissolved organic matter (DOM) in water influence the rate of production of reactive intermediates (RIs), affecting the photodegradation of phenolic contaminants of emerging concern (PhCECs). However, this relationship has not been fully quantified. Here, for the first time, we propose a mechanism for photodegradation of a surrogate of PhCECs, p-cresol, in different DOM standard solutions under simulated sunlight irradiation. More importantly, the correlation of DOM optical parameters and p-cresol photodegradation kinetic parameters was determined by Pearson correlation. Results showed that indirect photodegradation was the only degradation pathway for p-cresol, mainly through reaction with excited triplet state of dissolved organic matter ( 3 DOM*). Singlet oxygen ( 1 O 2 ) and hydroxyl radical ( • OH) hindered degradation of p-cresol by decreasing the steady state concentration of 3 DOM*. Moreover, less aromatic and smaller molecular size DOM showed higher steady-state concentration and quantum yield of 1 O 2 , and 3 DOM*, resulting in faster p-cresol photodegradation. Finally, 7 out of 8 optical parameters showed strong correlation with the p-cresol photodegradation rate constant. The mechanism and correlations found are a potential tool to predict PhCECs photodegradation in water using DOM optical parameters.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests. Itzel Marquez reports financial support was provided by Central Michigan University. Emad Sanei reports financial support was provided by Earth and Ecosystem Science PhD program at Central Michigan University.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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