Surface adsorption of ideal and strictly regular binary mixtures

Surface adsorption of ideal and strictly regular binary mixtures 

Danek and Proks (1998) proposed a new approach to calculate the surface adsorption of 

Taking into account the dependency of 2 on composition, Eq. (6.29) can be integrated. However, any composition dependency of the surface adsorption must fulfill the following boundary conditions for X2 = 0 is 2 = 0, but for X2 = 1, 2 attains some non-zero value. Such properties fulfill well the general function 

For ideal solutions, the second term in parentheses on the right side of Eq. (6.29) vanishes and for such solutions, we can assume that the surface adsorption increases linearly with composition, i.e. 2 = x2Cq. Such a behavior follows indirectly, e.g. from the results of 

From Eq. (6.39), it follows that for ideal solutions the surface tension obeys the simple additivity law. For the surface tension of the second component it follows from Eq. (6.39) that 

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