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Influence of nitrite on the degradation of halogenated phenols in sulfate radical oxidation processes |
GUI Jing-jing, LIU Jia-ting, YANG Pei-zeng, CHEN Jing, JI Yue-fei, LU Jun-he |
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China |
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Abstract The influence of nitrite (NO2-) on the degradation of bromophenol and chlorophenol by sulfate radical (SO4•–) oxidation was systematically investigated in this work. Results showed that the presence of NO2- accelerated the degradation of bromophenol, while posed a weak effect on the degradation of chlorophenol. Meanwhile, NO2- led to a series of toxic nitrated byproducts. Upon SO4•– oxidation, halophenols underwent dehalogenation and the released halides can be further oxidized by SO4•– to form reactive halogen species, which rapidly react with some intermediates and the parent compounds to form halogenated byproducts, such as haloform and haloacetic acid. Once NO2- was co-present, these reactive halogen species can be scavenged by NO2- to form a strong oxidizing agent, nitryl halide. Then nitryl halide reacts with the parent halophenol, promoting their degradation and resulting in the formation of nitrated byproducts. Besides, NO2- can be oxidized to nitrogen dioxide radicals (NO2·) by SO4•–, which further couple with phenoxy radicals generated from the oxidation of halophenols by SO4•–, yielding nitrated byproducts as well. Note that, the formation of nitrated byproducts from bromophenol (9.2 μmol/L) was significantly higher than those generated from chlorophenol (5.7μmol/L) with 200 μmol/L NO2- present. In SO4•– oxidation process, bromophenol is more prone to dehalogenation than chlorophenol. Therefore, the influence of NO2- on the transformation of bromophenol was more drastic than that of chlorophenol by SO4•–. These findings reveal potential risks of the application of SO4•– oxidation technologies for the remediation of halogenated contaminants in the subsurface environment, and provide new insights into the interaction of nitrogen and halogen in SO4•– oxidation processes.
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Received: 19 November 2023
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