Kurbatov coefficients, adsorption

The results of two sets of computations are shown in Figure 12. Open circles represent calculations for the binary adsorbent systems which used the Kurbatov coefficients for the end-member systems. This is the approach used by Davies-Colley et al., (9) in their examination of metal ion adsorption in mixtures of model... 

Figure 10. Comparison of calculated and observed adsorption densities for Cd(II) adsorption on OI-AI2O3. A single set of Kurbatov coefficients is used for the entire range of adsorption densities.

The information in Figure 14 was produced in the following way. The slope (or the Kurbatov coefficients shown in Table V) and position of the fractional absorption gdges in Figure 3 were used as the criteria of model fit. Kcd an< CdOH were used as the fitting parameters and all other parameters were held constant. Consequently, the intrinsic constants shown in Figure 14a represent best fit parameters and, given that all other surface and solution association constants are invariant, constitute a unique solution set for each adsorption density. 

To what extent are assumptions of a constant x valid Table II shows the observed macroscopic proton coefficients for cation and anion adsorption in a variety of heterogeneous systems. The coefficients were determined by Kurbatov plots ( 6) or by isotherm analysis ( 7), unless otherwise indicated. In all cases, x is not an integer. 

Figure 4. Kurbatov a) proton and b) partitioning coefficients as a function of adsorption density.

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