Details

Autor(en) / Beteiligte

• Cheng, Sisi
• Wang, Xueyu
• Zou, Pengcheng
• Sun, Zhenkun
• Wei, Xiaoxuan
• Ma, Guangcai
• Yu, Haiying

Titel

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

Ist Teil von

• Journal of environmental management, 2024-07, Vol.364, p.121473, Article 121473

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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. [Display omitted] •The reactions of AM/ACN with HO•/ClO•/BrO• are compared by the theoretical method.•Amide is easier to activate CC bond than cyanide with a larger k of AM than ACN.•The order of k is HO•>BrO•>ClO•, but the lifetime by HO• is closed to by BrO•.•Graphene shows a better adsorption performance for AM/ACN.•Products toxic of ClO•/BrO• are higher than HO•-reaction, but lower than AM/ACN.