Abstract
Adsorption of surfactants has important applications in many industrial processes such as enhanced oil recovery, detergency and flotation. Among the different factors that influence surfactant adsorption, surfactant structure plays a major role. The purity of the surfactant is critical in adsorption studies because impurities even in small amounts can mask the effect of structural variations on adsorption. In this study, effect of position of sulfonate and methyl groups on the benzene ring on the adsorption of alkyl xylene sulfonates on alumina was investigated using isomerically pure surfactants. Change in charge characteristics of the mineral due to the surfactant adsorption was investigated by measuring the zeta potential. Microcalorimetry was used to measure the enthalpies of adsorption and micellization of the surfactants. Position of the functional groups on the ring showed a marked influence on the adsorption and this is explained on the basis of electrostatic and steric effects that are dependent on the relative positions of the groups. The studies also showed that at low adsorption densities enthalpy was the governing factor, while at higher coverages, entropy was the main driving force.
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Sivakumar, A., Somasundaran, P., Thach, S. (1991). Thermodynamic Studies of Adsorption and Micellization of Alkyl Xylene Sulfonates. In: Mittal, K.L., Shah, D.O. (eds) Surfactants in Solution. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3836-3_20
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DOI: https://doi.org/10.1007/978-1-4615-3836-3_20
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