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- W4378188521 abstract "Recovery of surfactants and retrieval of hydrocarbons from eluted emulsions in surfactant-enhanced washing are essential to save useful resources and avoid secondary contamination. A novel nonionic surfactant of C6-DIB-PEG has been constructed by using a dynamic imine bond (DIB) as the linker between hexyl amine (C6-NH2) and an aromatic aldehyde modified polyethylene glycol (PEG-CHO). The results presented in this study reveal that an oil-in-water emulsion of tetradecane-H2O stabilized by C6-DIB-PEG is pH-switched. Upon reaction with HCl, C6-DIB-PEG readily converts to its inactive forms C6-NH3+Cl− and PEG-CHO when the pH is changed from 12.0 to 4.0, resulting in a complete tetradecane-water two-phase separation. Both C6-NH3+Cl− and PEG-CHO are insoluble in tetradecane but soluble in water, allowing subsequent retrieval of nearly surfactant-free tetradecane. Recovery of C6-DIB-PEG was enabled by treating aqueous solutions of C6-NH3+Cl− and PEG-CHO with NaOH after pH was increased from 4.0 to 12.0. The pH-switched C6-DIB-PEG renders a potential use for oil retrieval and surfactant recovery in the postprocessing of eluted emulsions, as demonstrated by the C6-DIB-PEG-enhanced washing of tetradecane-contaminated sand. Around 95.2% of the tetradecane and about 99.7% of the C6-DIB-PEG were retrieved and recycled over 10 cycles of washing. In addition, the total organic carbon (TOC) of the residual wastewater was remarkably reduced from around 7065.3 to ~54.1 mg L−1 after NaHSO3 treatment followed by ion-exchange resin and active carbon adsorption." @default.
- W4378188521 created "2023-05-26" @default.
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- W4378188521 date "2023-05-25" @default.
- W4378188521 modified "2023-09-30" @default.
- W4378188521 title "Recyclable dynamic imine‐based nonionic surfactants and potential use in postprocessing of eluted emulsions" @default.
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- W4378188521 doi "https://doi.org/10.1002/jsde.12690" @default.
- W4378188521 hasPublicationYear "2023" @default.
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