Abstract
The uptake of hydrolyzable metal ions by oxide adsorbents in aqueous ammoniacal solutions has been interpreted in terms of a mechanism involving the competitive adsorption of all the aqueous species. An adsorption model is presented which combines double layer theory with properties of the substrate (pzc, dielectric constant), the solvent medium (dielectric constant) and the aqueous ionic species (stability constants). It is proposed that specific effects due to the presence of hydroxyl groups in an aqueous complex and solvation effects due to the dielectric constant of the substrate play a dominant role in the up-take of metal by oxide colloids in aqueous ammoniacal solutions.
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