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Environ Technol

Title:		Vapour-liquid equilibrium relationship between toluene and mixed surfactants
Author(s):		Tian S; Li Y; Mo H; Ning P;
Address:		"Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China. tiansenlin@yahoo.com.cn"
Journal Title:		Environ Technol
Year:		2012
Volume:		33
Issue:		13-15
Page Number:		1561 - 1567
DOI:		10.1080/09593330.2011.635711
ISSN/ISBN:		0959-3330 (Print) 0959-3330 (Linking)
Abstract:		"Micellar partitioning of volatile organic compounds (VOCs) in surfactant solutions and its effects on vapour-liquid equilibrium is fundamental to the overall design and implementation ofsurfactant-enhanced remediation. Knowledge of the vapour-liquid equilibrium partitioning coefficients for VOCs, especially in contaminated soils and groundwater in which they exist, is required. Headspace experiments were performed to quantify the effect of three mixed surfactants, cetyltrimethyl ammonium bromide (CTMAB) with tetrabutylammonium bromide (TBAB), sodium dodecyl sulphate (SDS) with Triton X-405 (TX405), and CTMAB with Triton X-100 (TX100), on the apparent Henry's constants (Hc) of toluene at temperatures ranging from 25 degrees C to 40 degrees C. The Hc values were significantly reduced in the presence of all three mixed surfactants at concentrations above their critical micelle concentrations (CMC). Mixed micellar partitioning, showing effects on the vapour-liquid equilibrium of toluene, was primarily responsible for the significant reduction of Hc in their mixed systems. The mixed surfactants CTMAB-TX100 had the greatest effect on Hc above the CMC, followed by SDS-TX405, then CTMAB-TBAB. Mixed systems of CTMAB-TX100 decreased Hc at concentrations significantly lower than the SDS-TX405 and CTMAB-TBAB concentrations, because of to the lower CMC of CTMAB-TX100. Vapour-liquid equilibrium data were also tested against the model (Hc = H/(1 + K(X - CMC)) that described the partitioning of VOCs in vapour-water-micelle phases. The correlation of Hc with mixed surfactant concentrations (X) and CMC can be utilized as an effective tool to predict the Hc by mixed surfactants"
Keywords:		Cetrimonium Cetrimonium Compounds/chemistry Environmental Restoration and Remediation/methods Micelles Octoxynol Sodium Dodecyl Sulfate/chemistry Soil Pollutants/chemistry Solubility Surface-Active Agents/*chemistry Temperature Toluene/*chemistry Volatile;
Notes:		"MedlineTian, Senlin Li, Yingjie Mo, Hong Ning, Ping eng Research Support, Non-U.S. Gov't England 2012/09/20 Environ Technol. 2012 Jul-Aug; 33(13-15):1561-7. doi: 10.1080/09593330.2011.635711"