Solubilization of selected polycyclic aromatic compounds by nonionic surfactants |
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Authors: | Mar Mar Swe Liya E Yu Kun-Chih Hung Bing-Hung Chen |
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Affiliation: | (1) Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore;(2) Department of Chemical Engineering, National Cheng Kung University, 70101 Tainan, Taiwan |
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Abstract: | Solubilization of selected polycyclic aromatic compounds (PAC) by biodegradable nonionic surfactants, Tergitol 15-S-X (X=7 or 9) and Neodol 25–7, was investigated and correlated with micellar properties of these surfactants. These PAC include
dibenzofuran, phenanthrene, acenaphthene, fluoranthene, and 9-chloroanthracene. Tergitol surfactants are mixtures of secondary
ethoxylated alcohols, and Neodol 25–7 is a mixture of similar species but has the alcohol group in the primary position. These
surfactants have the same chain length of hydrophobic tails and similar numbers of ethylene oxides. The results show that
the Neodol surfactant yields micelles having larger hydrophobic core volume and renders a higher solubilization capacity for
the PAC solubilizates in comparison with Tergitol surfactants. In general, aggregation numbers and micellar sizes both increase
at elevated temperatures still below the cloud point. The micellewater partition coefficients of these PAC by the nonionic
surfactants were well correlated to their octanol-water partition coefficients. Moreover, an estimated log K
ow value of 9-chloanthracene is 4.78. |
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Keywords: | Light scattering micelle nonionic surfactant polycyclic aromatic compound (PAC) solubility solubilization |
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