Theoretical studies on the aqueous phase and graphene heterogeneous degradation of acrylamide and acrylonitrile by HO, ClO, and BrO radicals.

Autor: Cheng S; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China., Wang X; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China. Electronic address: xywang@zjnu.edu.cn., Zou P; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China., Sun Z; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China., Wei X; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China., Ma G; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China., Yu H; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China. Electronic address: yhy@zjnu.cn.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2024 Jul; Vol. 364, pp. 121473. Date of Electronic Publication: 2024 Jun 14.
DOI: 10.1016/j.jenvman.2024.121473
Abstrakt: The newly discovered ClO• and BrO• contribute to pollutant degradation in advanced oxidation processes, while acrylamide (AM) and acrylonitrile (ACN) are always the focus of scientists concerned due to their continuous production and highly toxic effects. Moreover, various particles with a graphene-like structure are the companions of AM/ACN in dry/wet sedimentation or aqueous phase existence, which play an important role in heterogeneous oxidation. Thus, this work focuses on the reaction mechanism and environmental effect of AM/ACN with ClO•/BrO•/HO• in the water environment under the influence of graphene (GP). The results show that although the reactivity sequence of AM and ACN takes the order of with HO• > with BrO• > with ClO•, the easiest channel always occurs at the same C-position of the two reactants. The reaction rate constants (k) of AM with three radicals are 2 times larger than that with ACN, and amide groups have a better ability to activate CC bonds than cyanide groups. The existence of GP can accelerate the target reaction, and the k increased by 9-13 orders of magnitude. The toxicity assessment results show that the toxic effect of most products is lower than that of parent compounds, but the environmental risk of products from ClO•/BrO•-adducts is higher than those from HO•-adducts. The oxidative degradation process based on ClO• and BrO• deserves special attention, and the catalytic effect of GP and its derivatives on the oxidation process is non-negligible.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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