The association reactions involving counterions, Na+ and Mg2+, and micelles composed of the anionic surfactant, dodecylsulfate (DS−), were investigated in ultrafiltration experiments. To access the data, an innovative model was developed that considered specific counterion binding within a Stern layer, with binding constant dependent upon the electrical potential as derived by the Poisson-Boltzmann equation and with calculation of the cmc as a function of counterion binding (or association). The experimental and model results both show that magnitude of counterion binding is greater for divalent species, Mg2+, than that for the monovalent species, Na2+. However, high concentration of Na+ compete for surface area diminishing the ability of the DS− to bind either divalent species. At experimental conditions from 0 to 100 mM NaCl addition, the binding ratio (BR) varied only from 0.58 to 0.63. The optimum binding constants, KMg and KNa, were determined to be 0.4 and 1.0 L mol−1, respectively, for the model. The experimental data and model calculated results were generally in good agreement.
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Research Article|
October 01 1998
Groundwater remediation by anionic surfactant micelles - an innovative double layer model applied to Na+ and Mg2+ association with dodecylsulfate micelles
Ching Yuan;
Ching Yuan
*Department of Civil Engineering, 1-Shou University, #1, Sec. 1, Hsueh-Cheng Rd., Ta-Hsu Hsiang, Kaohsiung County, 84008, Taiwan
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Chung-Hsuang Hung;
Chung-Hsuang Hung
**Department of Environmental Engineering, Foo-Yin Institute of Technology, Ta-Liao Hsiang, Kaohsiung, County Taiwan
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Chad T. Jafvert
Chad T. Jafvert
**School of Civil Engineering, 1284 Civil Engineering Building, Purdue University, West Lafayette, IN 47907, USA
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Water Sci Technol (1998) 38 (7): 99–106.
Citation
Ching Yuan, Chung-Hsuang Hung, Chad T. Jafvert; Groundwater remediation by anionic surfactant micelles - an innovative double layer model applied to Na+ and Mg2+ association with dodecylsulfate micelles. Water Sci Technol 1 October 1998; 38 (7): 99–106. doi: https://doi.org/10.2166/wst.1998.0282
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