Adsorption of Plutonium (IV) on SiO₂ or Al₂O₃ from HNO₃ Solution Containing KlO₃

Abstract

Adsorption behavior of Pu (IV) on SiO₂ or Al₂O₃ from HNO₃ solution containing KIO₃ has been studied.
Adsorption ratio, D (ml/g) increases with the concentration of KIO₃ and decreases with the concentration of HNO₃. On the basis of the variation of D with the concentration of KIO₃, stability constants of Pu (IN) complexes with IO₃^-are calculated and it is concluded to be most reasonable that adsorption of Pu (IV) does not result from apparent postprecipitation of Pu (IO₃) ₄ on SiO₂ or Al₂O₃, but interaction between positively charged SiO₂ or Al₂O₃ and Pu (I0₃) ₆^2- complex anion.