Different reaction mechanisms of SO• and •OH with organic compound interpreted at molecular orbital level in Co(II)/peroxymonosulfate catalytic activation system.

Water Res

College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; The Key Laboratory of Water and Sediment Sciences (Ministry of Education), International Joint Laboratory for Regional Pollution Control (Ministry of Education), Peking University, Beijing 100871, China. Electronic address:

Published: February 2023

Hydroxyl radical (•OH) and sulfate radical (SO•) produced in advanced oxidation processes (AOPs) have been widely studied for organic contaminants degradation, however, the different radical characteristics and reaction mechanisms on organics degradation are still needed. In this study, a homogeneous Co(II)/peroxymonosulfate activation system was established for caffeine (CAF) degradation, and pH was controlled to regulate the radicals production. The different attack routes driven by SO• and •OH were deeply explored by transformation products (TPs) identification and theoretical calculations. Specifically, a method on dynamic electronic structure analysis of reactants (R), transition state (TS) and intermediates (IMs) during reaction was proposed, which was applied to elucidate the underlying mechanism of CAF oxidation by •OH and SO• at the molecular orbital level. In total, SO• is kinetically more likely to attack CAF than •OH due to its higher oxidation potential and electrophilicity index. Single electron transfer reaction (SET) is only favorable for SO•due to its higher electron affinity than •OH, while only •OH can react with CAF via hydrogen atom abstraction (HAA) route. Radical adduct formation (RAF) is the most favorable route for both •OH and SO• attack according to both kinetics and thermodynamics results. These findings can significantly promote the understanding on the degradation mechanism of organic pollutants driven by •OH and SO• in AOPs.

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Source
http://dx.doi.org/10.1016/j.watres.2022.119392DOI Listing

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