First example of diglycolamide-grafted resins: synthesis, characterization, and actinide uptake studies

Abstract

Two diglycolamide (DGA)-functionalized chelating extraction resins were prepared for the first time by grafting onto a silica matrix and were evaluated for their actinide ion uptake behavior. The resins with one and two DGA moieties, termed as resin-I and resin-II, were quite efficient for the actinide ions, particularly the tri-and the tetravalent ions in a way similar to the diglycolamide extractants. The hexavalent UO 2 2+ ion was poorly sorbed onto the resins. The resins were characterized by thermal analysis, while the surface area and surface morphology were analyzed by BET and SEM techniques. Resin-II showed a pre-concentration factor of >100 for Am(III) by elution with 0.01 M EDTA.

Understanding Nitric Acid-Induced Changes in the Arrangement of Monomeric and Polymeric Methacryloyl Diglycolamides on Their Affinity toward f-Element Ions

“…26 In the case of DGA-grafted silica, the elution of Am(III) was also straightforward. 25 To clarify this, the poly(methacryloyl-DGA) samples were treated with HNO 3 and subjected to SAXS analysis. From the SAXS profiles in Figure 3, it is clear that distinct changes in the physical structure of the poly(methacryloyl-DGA) matrix occur upon HNO 3 treatment.…”

“…It is also important to note that Am 3+ could not be deloaded from the poly(methacryloyl-DGA) matrix using the disodium salt of EDTA, while deloading from organic-phase-containing methacryloyl-DGA was rather easy . In the case of DGA-grafted silica, the elution of Am(III) was also straightforward …”

“…This explains the involvement of four diglycolamide units and three to six nitrate ions in the complexation with an An(III) ion. ,− SANS studies carried out by Pathak et al have indicated that the aggregate size increases with increasing acidity and goes beyond the formation of tetramers at 6 mol L –1 nitric acid ( n = 8.2) . On the basis of these studies, DGA groups have been preorganized on trialkylphenyl and calix[4]arene platforms and also as bisdiglycolamide, giving rise to enhanced extraction of Am(III) and Eu(III). − Recently, a DGA-containing silica resin has been synthesized, which has been found to be quite efficient for actinide(III,IV) extraction in a similar way as diglycolamide extractants . It is interesting to note that polymeric DGA formed by using N , N -dioctyl, N ′-propyl-2-methylacrylamide diglycolamide (methacryloyl-DGA) as a monomer showed a similar behavior, although nitric acid-induced aggregation is not expected in a cross-linked polymeric form …”

“…22−24 Recently, a DGA-containing silica resin has been synthesized, which has been found to be quite efficient for actinide(III,IV) extraction in a similar way as diglycolamide extractants. 25 It is interesting to note that polymeric DGA formed by using N,N-dioctyl,N′-propyl-2methylacrylamide diglycolamide (methacryloyl-DGA) as a monomer showed a similar behavior, although nitric acidinduced aggregation is not expected in a cross-linked polymeric form. 26 The present work deals with a study on the changes in the geometrical arrangement of the aggregates of asymmetric methacryloyl-DGA and poly(methacryloyl-DGA) upon equilibration with nitric acid using SAXS to understand the sorption/ desorption behavior of Ln(III)/An(III,IV,VI) in the different spatial arrangements of DGA groups.…”

Evaluation of polybenzimidazole-based polymers for the removal of uranium, thorium and palladium from aqueous medium

“…Regarding actinides, use of trialkyl phosphine oxide functionalized task specific ionic liquids for the recovery of actinides [5] and separation of minor actinides from acidic PUREX waste solution using bis (2-ethylhexyl) sulfoxides have also been reported [6]. Mohapatra et al [7] investigated the uptake of actinides using diglycolamidegrafted resins as stationary phase. Several studies also reported recovery of lanthanides and actinides using octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) as the stationary phase [8][9][10][11][12][13].…”