Studies on the adsorption behavior of americium and europium on radiolytically degraded solvent impregnated resin containing neutral and acidic extractants

摘要

The trivalent actinide selective neutral extractants such as carbamoylmethylphosphine oxide (CMPO) and bis-(2-ethylhexyl)diglycolamide (TEHDGA) in conjunction with an acidic extractant bis-2-ethylhexylphosphoric acid (HDEHP) have been impregnated in Tulsion ADS 400, and the resultant solvent impregnated resin (SIR) has been evaluated for the radiolytic stability towards gamma radiation. The extraction behavior of Am(III) and the loading behavior of Eu(III) in the SIR was studied as a function of absorbed dose up to 550 kGy, at different nitric acid concentrations in aqueous phase. The extraction isotherm of Eu(III) in various SIRs have been fitted using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) adsorption models. The extraction results and modeling of extraction isotherms obtained at various absorbed dose levels have been reported in this paper.