Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0021-9797(03)00403-X
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dc.titleEquilibrium partition of polycyclic aromatic hydrocarbons in a cloud-point extraction process
dc.contributor.authorLi, J.-L.
dc.contributor.authorChen, B.-H.
dc.date.accessioned2014-10-09T09:53:28Z
dc.date.available2014-10-09T09:53:28Z
dc.date.issued2003-07-15
dc.identifier.citationLi, J.-L., Chen, B.-H. (2003-07-15). Equilibrium partition of polycyclic aromatic hydrocarbons in a cloud-point extraction process. Journal of Colloid and Interface Science 263 (2) : 625-632. ScholarBank@NUS Repository. https://doi.org/10.1016/S0021-9797(03)00403-X
dc.identifier.issn00219797
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/91975
dc.description.abstractA cloud-point extraction (CPE) process using the nonionic surfactant Tergitol 15-S-7, a secondary ethoxylated alcohol, to extract selected polycyclic aromatic hydrocarbons (PAHs) from aqueous solutions is investigated. The CPE process is facilitated at the ambient temperature, ca. 22°C, by the reduction of the cloud-point temperature of the surfactant solution by addition of sodium sulfate. It is observed that the preconcentration factor could be enhanced either by increasing the salt concentration or by decreasing the initial surfactant concentration in the micellar solution. A high preconcentration factor of about 40 was achieved at 1 wt% surfactant concentration with the addition of 0.6 M Na2SO4. It is also noted that the equilibrium partition coefficients of the model PAHs are nearly independent of surfactant concentrations, up to 3 wt%, in this study. Correlations between the equilibrium partition coefficients Kp of the PAHs and their octanol-water partition coefficients Kow, as well as Kp and the molar volume Vx of these PAHs, indicate that the partition processes of the PAHs in the CPE processes are mainly governed by their hydrophobic affinities to the surfactant aggregates. Furthermore, the effect of added Na2SO4 on the equilibrium partition coefficients is also studied. It is shown that addition of more Na2SO4 to the surfactant solution gives more partition of the PAHs into the surfactant-rich phase. © 2003 Elsevier Inc. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/S0021-9797(03)00403-X
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentCHEMICAL & ENVIRONMENTAL ENGINEERING
dc.description.doi10.1016/S0021-9797(03)00403-X
dc.description.sourcetitleJournal of Colloid and Interface Science
dc.description.volume263
dc.description.issue2
dc.description.page625-632
dc.description.codenJCISA
dc.identifier.isiut000183927000035
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