Abstract
The effects of finite ion size and polyion concentration on the adsorption isotherms are examined within the context of a one-dimensional lattice restricted to nearest-neighbor interactions. The nearest-neighbor interactions include that of the bound ion with adjacent lattice sites as well as with a neighbor bound ion. Both screened and unscreened Coulombic interactions are employed, as they are shown to exhibit different behaviors under high salt concentrations. For the screened interactions, previously adsorbed ions are released, whereas for the unscreened Coulombic interaction charge reversal is observed for sufficiently separated lattice sites. The effect of polyion concentration is to provide a constant degree of adsorption for added salt concentrations less than the concentration ofcounterions released by the polyion. The model is applied to experimental data on monovalent and divalent salts.
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