Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 162, Issue -, Pages 77-83Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2016.02.017
Keywords
TODGA; Calixarenes; Radiolysis; EPR; GC-MS
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Ionic liquid-based solvent systems containing diglycolamide-functionalized calix[4]arenes (C4DGAs) are efficient for actinide ion extraction from nitric acid feeds. Therefore, the radiolytic stability of three C4DGAs (wide-rim, narrow-rim and both side DGA-functionalized calix[4]arenes) and TODGA (N,N,N',N'-tetraoctyldiglycolamide) (used for comparison purpose), was evaluated by exposing their solutions in an ionic liquid as well as a 95:5 mixture of n-dodecane + isodecanol to gamma radiation up to an absorbed dose of 1000 kGy. Liquid-liquid extraction studies were carried out using Am-241 as a radiotracer. Apart from a decrease in the D-Am values, ascribed to radiolytic degradation, FT-IR, EPR and GC-MS studies were carried out to characterize the degraded species. The different extractants are less sensitive to radiolytic degradation in the ionic liquid than in the molecular diluent. (c) 2016 Elsevier B.V. All rights reserved.
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