Solubilization of polycyclic aromatic hydrocarbons by anionic–nonionic mixed surfactant
ABSTRACT Surfactant-enhanced remediation (SER) is an effective approach for the removal of sorbed hydrophobic organic compounds (HOCs) from contaminated soils. The solubilization of polycyclic aromatic hydrocarbons (PAHs) by an anionic–nonionic mixed surfactant, sodium dodecyl sulfate (SDS) with Triton X-405 (TX405), was studied from measurements of the maximum additive concentration (MAC), the micelle–water partition coefficient (Kmc) and the critical micelle concentration (CMC). The results are also compared with that predicted by the ideal mixing rule. The MAC and Kmc values for each PAHs in mixed surfactant are found to be larger than those calculated according to the ideal mixing rule. The mixing effect on MAC and Kmc values for PAHs follow the order of pyrene > phenanthrene > acenaphthene > naphthalene and increase with an increase in the octanol–water partition coefficient (Kow) of PAHs. The CMCs of mixed surfactant show a greater negative deviation from ideal mixture and the SDS–TX405 mixed system has a synergism in the mixed micelle formation. The conjunct role of mixing effect on Kmc and CMC results in the positive deviation of PAHs experimental MACs from the ideal mixture. The correlation of MAC with Kmc and CMC can be utilized as an effective tool to predict the solubilization capability of HOCs by anionic–nonionic mixed surfactants.
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ABSTRACT: The overall goal of this study was to improve the solubility of tar compounds in water using a surfactant, sodium dodecyl sulfate (SDS). The solubility experiments were performed using 100-ml media bottles. Benzene, toluene, ethylbenzene, styrene, and p-xylene were used as model tar compounds because these compounds are sparingly soluble in water. The solubility of tar compounds was measured using UV/VIS spectrophotometer. Statistical analysis showed that solubilities of tar compounds improved significantly (p b 0.0001) using SDS above the critical micelle concentration. Experimental results showed that the solubility of benzene, toluene, ethylbenzene, styrene and p-xylene increased 4 to 14, 9 to 33, 19 to 69, 18 to 83 and 29 to 135 fold, respectively, as SDS concen-tration increased from 0, i.e., water as control to 15, 30, 45 and 60 g/L at solvent temperature of 20 °C. Results also showed that solubilities of benzene, toluene and ethylbenzene decreased as the solvent temperature increased.01/2015; 133:75–79.
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ABSTRACT: Plots of PAH concentration versus gemini (G6) concentration in 1:1 mixtures showing solubilization of PHE and FLR found to be G6-CTAB > G6-Brij35 > G6-SDS.Chinese Journal of Chemical Engineering 06/2014; · 0.87 Impact Factor
- Colloids and Surfaces A Physicochemical and Engineering Aspects 10/2014; 459:82–89. · 2.35 Impact Factor