Cloud-point extraction of selected polycyclic aromatic hydrocarbons by nonionic surfactants

Kun Chih Hung, Bing Hung Chen, Liya E. Yu

研究成果: Article

57 引文 (Scopus)

摘要

Effect of nonionic surfactants on the performance of the cloud-point extraction (CPE) processes in preconcentrating trace amount of polycyclic aromatic hydrocarbons (PAHs), consisting of two to five fused rings, from aqueous solution at 25 °C was studied. Three biodegradable nonionic surfactants with molecular similarity were employed. Cloud-point temperatures (CPTs) of these micellar solutions were regulated and reduced enough with addition of sodium sulfate and sodium phosphate, so that the CPE process could be facilitated at 25 °C. Furthermore, quadratic equations in additive concentration are found to fit the CPTs of these micellar solutions well. It is observed that the preconcentration factor could be enhanced either by increasing the salt concentration or by decreasing the initial surfactant concentration present in the micellar solution. With CPTs regulated at around 15 and 18 °C with addition of Na2SO4 and Na3PO4, preconcentration factors in between 30 and 45 obtained from 1 wt% micellar solutions of these three surfactants appear in the order of Tergitol 15-S-9 > Neodol 25-7 > Tergitol 15-S-7, coincidently with the hydrophilicity order of surfactants. The average preconcentration factor was empirically fitted well as a simple power-law function of surfactant concentration used in the CPE process. The obtained empirical power-law indices are close to negative unity.

原文English
頁(從 - 到)1-10
頁數10
期刊Separation and Purification Technology
57
發行號1
DOIs
出版狀態Published - 2007 十月 1

指紋

Polycyclic Aromatic Hydrocarbons
Nonionic surfactants
Polycyclic aromatic hydrocarbons
Surface-Active Agents
Poloxalene
Surface active agents
Sodium sulfate
Hydrophilicity
Temperature
Phosphates
Salts
Sodium

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Filtration and Separation

引用此文

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AB - Effect of nonionic surfactants on the performance of the cloud-point extraction (CPE) processes in preconcentrating trace amount of polycyclic aromatic hydrocarbons (PAHs), consisting of two to five fused rings, from aqueous solution at 25 °C was studied. Three biodegradable nonionic surfactants with molecular similarity were employed. Cloud-point temperatures (CPTs) of these micellar solutions were regulated and reduced enough with addition of sodium sulfate and sodium phosphate, so that the CPE process could be facilitated at 25 °C. Furthermore, quadratic equations in additive concentration are found to fit the CPTs of these micellar solutions well. It is observed that the preconcentration factor could be enhanced either by increasing the salt concentration or by decreasing the initial surfactant concentration present in the micellar solution. With CPTs regulated at around 15 and 18 °C with addition of Na2SO4 and Na3PO4, preconcentration factors in between 30 and 45 obtained from 1 wt% micellar solutions of these three surfactants appear in the order of Tergitol 15-S-9 > Neodol 25-7 > Tergitol 15-S-7, coincidently with the hydrophilicity order of surfactants. The average preconcentration factor was empirically fitted well as a simple power-law function of surfactant concentration used in the CPE process. The obtained empirical power-law indices are close to negative unity.

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