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http://dx.doi.org/10.12925/jkocs.2020.37.5.1222

Physicochemical Characteristics of Selective Adsorption of Tin Phosphate on the Transition metal ions  

Ahn, Beom-Shu (Division of Life Science & Chemistry, Daejin University)
Publication Information
Journal of the Korean Applied Science and Technology / v.37, no.5, 2020 , pp. 1222-1228 More about this Journal
Abstract
The adsorption and ion exchange properties of tin phosphate were studied in an aqueous solution of KCl, varing the pH and metal ion concentration in the solution. The data were explained on the basis of chemical equilibrium. Tin phosphate behaved as an acidic ion exchanger and had an adsorption selectivity toward the bivalent transition metal ions in the following order : Cu+2 > Co+2 > Ni+2. As in the case of a weekly acidic exchanger, the change in hydration of metal ions played the dominant role in determining the selectivity of tin phosphate. In all cases the extent of adsorption increased with an increase in temperature and concentration. The apperance of irregular kinks in the titration curves justified the presence of several exchangeable adsorption sites with different pKa values.
Keywords
adsorption; chemical equilibrium; tin-phosphate; transition metal ion; ion exchanger;
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