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REDUCTIVE HEXACHLOROETHANE DEGRADATION BY S2O8 WITH THERMAL ACTIVATION OF PERSULFATE UNDER ANAEROBIC CONDITIONS
Zhu, C., F. Zhu, C. Liu, N. Chen, D. Zhou, G. Fang, and J. Gao.
Environmental Science & Technology 52(15):8548-8557(2018)

In this study, persulfate radical was found to degrade hexachloroethane (HCA) efficiently under anaerobic conditions, whereas HCA degradation was negligible in the presence of oxygen. PCA, PCE, and Cl as dechlorination products were observed during HCA degradation, which suggests that HCA degradation is mainly a reductive process under anaerobic conditions. Free radical quenching and electron paramagnetic resonance experiments confirmed that persulfate radical forms from the reaction between sulfate radical and persulfate ion, the dominant reactive species in HCA degradation. Density functional theory calculations were used to elucidate the pathways of HCA degradation and persulfate radical decomposition. Further investigation showed that persulfate radical can degrade HCA and DDTs in soil efficiently via reduction during the thermal activation of persulfate under anaerobic conditions.



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