Abstract
In this study, an environmentally friendly complexing agent, S,S′-ethylenediamine-N,N′-disuccinic acid (EDDS), was applied in Fe(III)-mediated activation of persulfate (PS), and the degradation performance of trichloroethylene (TCE) was investigated. The effects of PS concentration, Fe(III)/EDDS molar ratio, and inorganic anions on TCE degradation were evaluated, and the generated reactive oxygen species responsible for TCE removal were identified. The results showed that nearly complete TCE degradation was achieved with PS of 15.0 mM and a molar ratio of Fe(III)/EDDS of 4:1. An increase in PS concentration or Fe(III)/EDDS molar ratio to a certain value resulted in enhanced TCE degradation. All of the anions (Cl−, HCO3 −, SO4 2−, and NO −3 ) at tested concentrations had negative effects on TCE removal. In addition, investigations using radical probe compounds and radical scavengers revealed that sulfate radicals (SO ·−4 ), hydroxyl radicals (·OH), and superoxide radical anions (O ·−2 ) were all generated in the Fe(III)–EDDS/PS system, and ·OH was the primary radical responsible for TCE degradation. In conclusion, the Fe(III)–EDDS-activated PS process is a promising technique for TCE-contaminated groundwater remediation.
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Acknowledgments
This study was financially supported by grants from the National Natural Science Foundation of China (nos. 41373094, 51208199, and 21577033), Natural Science Foundation of Shanghai (16ZR1407200), China Postdoctoral Science Foundation (2015M570341), and the Fundamental Research Funds for the Central Universities (222201514339 and 22A201514057).
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Gu, X., Wang, Y., Miao, Z. et al. Degradation of trichloroethylene in aqueous solution by persulfate activated with Fe(III)–EDDS complex. Res Chem Intermed 43, 1–13 (2017). https://doi.org/10.1007/s11164-016-2601-0
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DOI: https://doi.org/10.1007/s11164-016-2601-0