Abstract
Foam separation experiments were carried out in various SDBS (sodium dodecylbenzene sulphonate) solutions containing several kinds of metal perchlorates. General estimation of the dynamic surface excess of various kinds of metal ions were tried by use of a model (G.C. model) derived on the basis of the Gouy-Chapman theory of the diffuse double layer. In the model the effect of hydration of the metal ions was taken into account. The surface excess of metal ion (Γmetal) from bulk concentration composition was directly estimated by use of the surface excess of DBS– (dodecylbenzene sulphonate) (ΓDBS–), which was estimated using both the Davies adsorption theory and the G.C. model. The calculated values of Γmetal were in good agreement with the experimental ones far below the critical micefle concentration. Therefore, the enrichment and removal percentage in the foam separation technique can be predicted.
