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• W3137032018 endingPage "129316" @default.
• W3137032018 startingPage "129316" @default.
• W3137032018 abstract "How to recycle surfactant and retrieve hydrophobic organic contaminants (HOCs) in the remediation of HOCs-polluted soil by means of surfactant-enhanced soil washing (SESW) is still a significant challenge. Here, a proof-of-concept strategy for solubilizing a model HOC of phenanthrene (Phe) in artificial Phe-polluted sand and co-pricipitating surfactant-Phe from the SESW effluent by reversible tuning Krafft temperature (KT) of surfactant via CO2/N2-bubbling was reported for the first time. In the presence of N,N,N’,N’-tetramethyl-1,2-ethylenediamine (TEMDA), the KT of sodium alkyl sulphonates (CnAS, n = 12, 14 and 16) was reduced after CO2-bubbling because of the formation of TEMDA carbonates; in contrast, the TEMDA carbonates could be deprotonated after the removal of CO2 by N2-bubbling, which enabled the KT to increase, allowing subsequent precipitation of CnAS. By alternating CO2- and N2-bubbling, the KT of CnAS-TEMDA could be reversibly switched over 10 cycles without causing obvious adverse distortions. The potential usage of this novel KT-tuning strategy was demonstrated in a conceptual C12AS-TEMDA-enhanced Phe-polluted sand washing. About 99.9% of Phe was solubilized by C12AS at room temperature, about 92% of C12AS and 99% of Phe could be co-precipitated, allowing both the total organic carbon and chemical oxygen demand of the residue wastewater were remarkably reduced to less than 25 mg L−1 after a simple and conventional treatment with active carbon and ion-exchange resin. The precipitated C12AS could be separated from Phe by a simple Soxhlet extraction." @default.
• W3137032018 created "2021-03-29" @default.
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• W3137032018 date "2021-08-01" @default.
• W3137032018 modified "2023-10-18" @default.
• W3137032018 title "Reversible CO2/N2-tuning Krafft temperature of sodium alkyl sulphonates and a proof-of-concept usage in surfactant-enhanced soil washing" @default.
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• W3137032018 doi "https://doi.org/10.1016/j.cej.2021.129316" @default.
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