Activation of Persulfate by Quinones: Free Radical Reactions and Implication for the Degradation of PCBs

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Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R. China
§ Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221-0012, United States
University of Chinese Academy of Sciences, Beijing 100049, P.R. China
*Phone: +86 25 86881180. Fax: +86 25 86881180. E-mail: [email protected]
Cite this: Environ. Sci. Technol. 2013, 47, 9, 4605–4611
Publication Date (Web):April 15, 2013
https://doi.org/10.1021/es400262n
Copyright © 2013 American Chemical Society
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Abstract

There has been considerable interest in the use of persulfate for in situ chemical oxidation of organic contaminants in soils, sediments, and groundwater. Since humic acid (HA) exists ubiquitously in these environmental compartments, its redox active functional moieties, such as quinones, may play an important role in the oxidation processes of persulfate treatments. Understanding the effects of HA, especially the quinone functional groups on the degradation of pollutants by persulfate and the production of sulfate radicals (SO4•-) from persulfate, is beneficial for devising effective and economically feasible remediation strategies. In this study, the effects of model quinone compounds and HA on the degradation of 2,4,4′-trichlorobiphenyl (PCB28) by persulfate and the production of SO4•- from persulfate were investigated. It was found that quinones and HA can efficiently activate persulfate for the degradation of PCB28. The mechanism of persulfate activation was elucidated by quenching and electron paramagnetic resonance (EPR) studies. The results indicated that production of SO4•- from persulfate and quinones was semiquinone radical-dependent. The effects of quinone concentrations were also studied. The findings of this study elucidated a new pathway of persulfate activation, which could degrade environmental contaminants efficiently and provide useful information for the remediation of contaminated soil and water by persulfate.

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Additional data including EPR spectra and changes in the intensities of DMPO–SO4, DMPO–OH, and semiquinone radical in different reaction systems can be found in this section. This material is available free of charge via the Internet at http://pubs.acs.org.

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