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Mechanism of surfactant in trichloroethene degradation in aqueous solution by sodium persulfate activated with chelated-Fe(II)

Sun, Y ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jhazmat.2020.124814
  3. Publisher: Elsevier B.V , 2021
  4. Abstract:
  5. 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−1 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−1), 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 SO4−• in PS/Fe(II)/CA system in TW-80 containing aqueous solution, among which SO4−• 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 containing TW-80 of TCE contaminant. This research provided a novel alternative technology for groundwater remediation with TCE contaminant when containing surfactants. © 2020 Elsevier B.V
  6. Keywords:
  7. Groundwater ; Groundwater pollution ; Molar ratio ; Nonionic surfactants ; Sodium compounds ; Trichloroethylene ; Alternative technologies ; Coupled process ; Ground water remediation ; In-situ chemical oxidations ; Inhibition mechanisms ; Sodium persulfate ; Iron compounds ; Citric acid ; Ferrous ion ; Ground water ; Nonionic surfactant ; Polidocanol ; Radical ; Scavenger ; Sodium derivative ; Sulfate ; Tw 80 ; Tx 100 ; Unclassified drug ; Aqueous solution ; Coupling ; Degradation ; Pollutant removal ; Remediation ; Surfactant ; Comparative study ; Controlled study ; Iron chelation ; Oxidation ; PH ; Solubilization ; Waste component removal ; Water contamination ; Water treatment
  8. Source: Journal of Hazardous Materials ; Volume 407 , 2021 ; 03043894 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0304389420328053?via%3Dihub