Exploring how exposure to radiolysis and harsh chemical reagents impact americium-241 extraction chromatography

Abstract

Improving control over radiolysis would advance nuclear technologies, spanning from radiotherapeutics to national security. Herein, we studied the effects of radiolysis on large-scale production of Am-241.

Advances in heavy alkaline earth chemistry provide insight into complexation of weakly polarizing Ra 2+ , Ba 2+ , and Sr 2+ cations

“…In step two, extraction chromatography was used to separate 223 Ra 2+ ( aq ) from 227 Ac 3+ ( aq ) . Last, in step three, organic contaminants introduced from the anion and extraction chromatography steps ( 46 , 48 , 49 ) were removed from 223 Ra 2+ ( aq ) using Pre-Filter Resin. The 223 Ra processing method was attractive because it could be completed on a time scale (~2 to 3 days) that was compatible with the relatively fast 223 Ra decay rate.…”

Electron transfer between neptunium and sodium chlorite in acidic chloride media

“…To recover plutonium and americium from aqueous waste streams, LANL implemented the experimental chloride extraction line (EXCEL) and chloride extraction and recovery (CLEAR) aqueous processing methods. 15,[24][25][26][27][28] In terms of plutonium recovery, waste entering the processing line contains plutonium in a variety of oxidation states. Hence, successful plutonium recovery requires a valence state adjustment that holds plutonium in the +4 oxidation state during subsequent chemical processing steps.…”

Crystalline versus Amorphous: High-Performance Hafnium Phosphonate Framework for the Separation of Uranium and Transuranium Elements

“…Metal phosphonate frameworks (MPFs) represent a burgeoning category of crystalline porous coordination polymers that consist of multivalent metal ions linked by phosphonate ligands with a multitude of applications, such as heterogeneous catalysis, − proton conductors, − selective adsorbents − as well as some other emerging directions. , MPFs consisting of tetra- or pentavalent metal ions and alkyl- or aryl-phosphonate ligands feature robust P–O–M bonds (e.g., M = Zr 4+ ) and exhibit a large affinity for actinides via phosphonate binding sites, which have evolved as a type of separation material not inferior to the state-of-the-art of carbonaceous, siliceous materials, covalent–organic frameworks, and polymeric resins in terms of separation performance and structural integrity under corrosive conditions. Besides, actinide-laden MPFs can be exploited as a stable primary waste form without an energy-consuming conversion to metal phosphate or oxide waste forms before final disposal .…”