Abstract
The adsorption of dipyridyl, zinc ions and Zn(dipy) 2+ complex from the aqueous solutions on nonporous highly dispersed silica was investigated as a function of concentration and pH. From the comparison of the adsorption data with the equilibria in solution, the most probable reactions occurring at the silica water interface at different pH values were deduced. The formation constants of the surface complexes (SiOH…dipy), (SiOH…Hdipy + ) and (SiO − Hdipy + ) were calculated. It was found that the adsorption of the complex Zn(dipy) 2+ was considerably enhanced compared to that of aquated Zn 2+ ions. It was determined that the Zn(dipy) 2+ complex interacts with either dissociated or un-dissociated silanol groups of silica with the formation, in both cases, of the surface ternary complex ((SiO) n Zn(dipy)) (2− n )+ .
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