| Abstract: |
FITEQL requires a constant solid-to-liquid ratio in serial data for calculations involving different models of an electric double layer. Two dummy components, introduced in the present paper, make it possible to handle data with variable solid-to-liquid ratios without changing anything in the source code. Experimental data (nickel and gadolinium adsorption on alumina) obtained for solid-to-liquid ratios ranging from 2 to 200 g (310 to 31 000 m2) per litre are analyzed as an example.
A triple-layer model was used to calculate the distribution of electric potentials in the interfacial region. The effect of the solid-to-liquid ratio and ionic strength on nickel adsorption can be reproduced quantitatively by a model in which a ≡OAlONi+ surface species is formed, i.e., one proton is released per one adsorbed Ni2+ ion, and the adsorbed nickel is located about half way between the plane of the surface charge and the β plane (the plane in which ions of the supporting electrolyte are adsorbed). |
