Abstract :
The electrokinetic potential (z-potential) is calculated using the combination of the Poisson–Boltzmann equation and the Surface Complexation
Models for energetically heterogeneous surface. This approach gives negative values of z for the whole pH region, which is in agreement with the
published results of z-potential measurements. Moreover, the correct changes of z-potential values for different types of montmorillonite are
observed. It is shown that electrokinetic properties of the considered systems are not as sensitive to surface heterogeneity as the adsorption
isotherms and surface charge densities. As it was shown in our previous paper [P. Zarzycki, F. Thomas, J. Colloid Interface Sci. 302 (2006) 547–
559], the presented model predicts parallel titration curves for reasonably small equilibrium constants of exchange processes. Here, we show
further development of this model in order to predict z-potential
