ADSORPTION FROM SOLUTIONS——ADSORPTION FROM MIXED SOLUTIONS OF TRITON X-100 AND SODIUM n-ALKYL SULFAT

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The adsorption of Triton X-100 and pure sodium n-alkyl sulfates (C_8, C_(10) and C_(12)) from single and mixed aqueous solutions on silica gel at 25°C has been determined. The adsorption of Triton X-100 shows unusual S-type isotherm. At higher concentrations, the adsorption isotherm reaches a plateau. This plateau coverage corresponds approximately to 1.00 nm~2 per adsorbed molecule. It seems that the packing of adsorbed Triton X-100 on silica/water interface is much less dense than that on the air/water interface. No significant effects of pH and of the presence of sodium chloride (0.1 M) have been observed. Moreover, no significant adsorption for sodium n-alkyl sulfates has been observed, either from single or from the mixed solutions. Thus the competitive adsorption between Triton X-100 and sodium n-alkyl sulfates may not be important.When dealing with the adsorption of Triton X-100 from the mixed solutions, there are two different effects and two different concentration regions can be discerned; (? The adsorption of Triton X-100 and pure sodium n-alkyl sulfates (C_8, C_ (10) and C_ (12)) from single and mixed aqueous solutions on silica gel at 25 ° C has been determined. The adsorption of Triton X- 100 shows unusual S-type isotherm. At higher concentrations, the adsorption isotherm reaches a plateau. This plateau coverage corresponds to to 1.00 nm ~ 2 per adsorbed molecule. It seems that the packing of adsorbed Triton X-100 on silica / water interface is much less dense than that on the air / water interface. No significant effects of pH and of the presence of sodium chloride (0.1 M) have been observed. Moreover, no significant effects of sodium n-alkyl sulfates has been observed, either from single There are two different effects and two different concentrations. Tenson X-100 and sodium n-alkyl sulfates may not be important. regions ca n be discerned; (?
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