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Mechanism of surfactant in trichloroethene degradation in aqueous solution by sodium persulfate activated with chelated-Fe(II) by Yong Sun; Ming Li; Xiaogang Gu; Muhammad Danish; Ali Shan; Meesam Ali; Zhaofu Qiu; Qian Sui; Shuguang Lyu is a Environmental Science article available to read on EtoBox.

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The mechanism of surfactants in surfactant-in situ chemical oxidation (S-ISCO) coupled process for trichloroethene (TCE) degradation was firstly reported. The performance of TCE solubilization and inhibition of TCE degradation in three nonionic surfactants (TW-80, Brij-35, TX-100) in PS/Fe(II)/citric acid (CA) system was compared and TW-80 was evaluated to be the optimal surfactant in S-ISCO coupled process due to the best TCE solubilizing ability and minimal inhibition for TCE degradation (only 31.8% TCE inhibition in the presence of 1 g L TW-80 surfactant). The inhibition mechanism in TCE degradation was also demonstrated by comparing the strength of ROSs and PS utilization. In the presence of TW-80 (1 g L), over 97.5% TCE was removed at the PS/Fe(II)/CA/TCE molar ratio of 30/4/4/1, in which more than 86.7% TCE was dechlorinated. The result of scavenger experiments revealed that the dominant radicals were HO• and SO• in PS/Fe(II)/CA system in TW-80 containing aqueous solution, among which SO• performed a greater role in TCE removal. Moreover, over 85.3% TCE degradation in actual groundwater revealed the potential of PS/Fe(II)/CA process for actual groundwater remediation in conta

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Author

Yong Sun; Ming Li; Xiaogang Gu; Muhammad Danish; Ali Shan; Meesam Ali; Zhaofu Qiu; Qian Sui; Shuguang Lyu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)