【标题】Cosolubilizationof 4,4′-dibromodiphenyl ether, naphthalene and pyrene mixtures invarious surfactant micelles

【期刊】ChemicalEngineering Journal

【第一作者】杨行健

【摘要】Thepresent study aims to investigate the cosolubilization of a range ofmixtures of polybrominated diphenyl ether (PBDE) (specifically,4,4′-dibromodiphenyl ether) and two polycyclic aromatichydrocarbons (PAHs) (specifically, naphthalene and pyrene) innonionic, cationic, and anionic surfactant systems. Cosolubilizationeffects were quantified in terms of molar solubilization ratio,micelle-water partition coefficient, and synergistic/suppressiveratio. ¹Hnuclear magnetic resonance (NMR) spectroscopy was used to investigatethe solubilization sites of naphthalene, pyrene, and4,4′-dibromodiphenyl ether in surfactant micelles. Duringcosolubilization, synergism was observed for naphthalene/pyrene inTween80, Brij58, CTAB, and SDBS micellar solutions due to palisadelayer solubilization of naphthalene and pyrene that resulted inreduction of interfacial tension, enabling the core volume toincrease. In contrast, inhibition occurred in Brij78 surfactantsystem due to weak interactions between PAHs and the hydrophilicchain, and competitive solubilization of PAHs for the samesolubilization site. 4,4′-Dibromodiphenyl ether probably had greataffinity for hydrophilic chains of surfactants due to non-covalenthalogen bonding that occurred between bromines and electron donors onthe hydrophilic chains, resulting in synergism for4,4′-dibromodiphenyl ether/pyrene in all surfactant systems andresulting in inhibition for 4,4′-dibromodiphenyl ether/naphthalenein Brij58, Brij78, and CTAB surfactant systems. The results of thisstudy provide valuable information that may improve the effectiveutilization of surfactants in removal of PBDEs and PAHs fromcontaminated soils and non-aqueous phase liquids (NAPLs) treated withsurfactant enhanced remediation (SER) technology.

【文章链接】https://doi.org/10.1016/j.cej.2014.08.101