ADSORPTION ISOTHERMS OF SOME COMMERCIAL SURFACTANTS ONTO CLAY. COMPARISONS WITH SYNTHESIS SURFACTANT |
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| Authors: | M.N. Shalaby |
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| Affiliation: | Egyptian Petroleum Research Institute , Nasr City, Cairo, Egypt |
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| Abstract: | Abstract The adsorption of polyoxyethylene mono soya bean fatty acid [Soy (EO)20,40 and 80] and polyoxyethylene (80) monolinoleate [Li(EO)80] onto Na-montmorillonite has been determined at 30°C. The adsorption isotherms of all the tested surfactants exhibit an L-shaped following the Langmuirian model. The experimental adsorption data are fitted to Langmuir adsorption equation, the maximum amount adsorbed, Γmax, and the minimum area occupied per molecule, Amax at the pseudo-plateau have been calculated. Γmax value increases with the increase in the number of ethylene oxide units following the order, Soy (EO)20 < Soy (EO)40 Soy (EO) ? Li (EO)80. Both Soy (EO)80 and Li (EO)80 nearly show the same adsorption behavior. |
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| Keywords: | Surfactant conductivity clay adsorption |
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