Surface Complexation Modeling of Yb(III) and Cs(I) Sorption on Silica.

A surface complexation model is used to describe sorption of ytterbium and cesium on the silica surface. The constant capacitance model gives the description of the solid-solution interface chosen for this work. The first step in the modeling consists of extracting the surface acidity constants. The result is: The second step consists of the extraction of surface complexation constants for both ytterbium and cesium. The sorption of the cations is represented as follows: for the ytterbium sorption, for the cesium sorption, In the case of cesium, the sorption of sodium is competitive and has to be considered: Copyright 1999 Academic Press.