1. A highly efficient in situ redox stabilization strategy for Am–Cm separation using AgBiO3.
- Author
-
Verma, Parveen K., Bhattacharyya, Arunasis, Samanta, Soumen, and Mohapatra, Prasanta K.
- Subjects
AQUEOUS solutions ,HIGH temperatures ,IONS ,OXIDATION ,ACETATES - Abstract
AgBiO
3 is reported for the exclusive oxidation of Am3+ → AmO2 + at near-neutral pH conditions. Literature methods of AmO2 + generation are generally two-step processes; i.e., Am3+ → AmO2 2+ oxidation followed by AmO2 2+ → AmO2 + reduction. These methods for Am3+ → AmO2 + oxidation use high temperatures (80–100 °C) and/or several reagents, causing the in situ presence of the AmO2 + -complex rather than the AmO2 + aq ions. This not only interferes with the much-needed Am–Cm selectivity but also limits the use of AmO2 + aq in any other experimental study. The single-step Am3+ → AmO2 + oxidation in the present work using AgBiO3 is done at 25 °C in a non-complexing medium at pH ∼4, making it a first-of-its-kind report. Am–Eu and Am–Cm separation in a single contact, with a separation factor >104 , was achieved using the present method, which is unprecedented among aqueous feed solutions. The AmO2 + generated using the present method under non-complexing pH conditions makes it also suitable for exploring the fundamental chemistry of the higher valent americyl ion. A complexation study using the thus-generated AmO2 + ion with acetate ion supports the concept. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF