Adsorption of synthesized 1-hexyl-3-methylimidazolium chloride ionic liquid (IL) in presence of different dosage of sodium and potassium chloride at toluene-water interface was investigated. Electrolytes decrease repulsive interaction between adsorbed IL by introducing chloride counterions in Sternlayer. As a result more declining in interrfacial tension is obtained in the presence of electrolytes. Sodium chloride with small and more hydrated cation has more influence on the interfacial tension decreasing. The related interfacial adsorption parameters are obtained by the Frumkin adsorption isotherm for concentrations less than critical micelle concentration. Accordingly the electrolytes enhance adsorption tendency and efficiency because of overcoming on electrostatic repulsion between IL hydrophilic portion.
