Adsorption of Bromide Ion at Mercury from Propylene Carbonate Solutions of Constant Ionic Strength.

摘要

The adsorption of Br anion has been studied from propylene carbonate solutions of low ionic strength (0.16 M) at mercury. A maximum on the capacity curve is observed at low Br ion concentration, a result of which is unusual for strongly absorbed ions. A new method of analyzing the interfacial thermodynamic data is available. When the present data are compared with those obtained in other solvents, it is shown that the standard Gibbs energy of adsorption changes with solvent acidity and basicity due to corresponding changes in anion solvation in the bulk, and the Gibbs energy of solvent adsorption on mercury, respectively. The adsorption parameters at the point of zero charge are examined with respect to non-primitive statistical mechanical models for ionic adsorption, discussed recently in the literature.