Highly selective separations of U(VI) from a Th(IV) matrix by branched butyl phosphates: Insights from solvent extraction, chromatography and quantum chemical calculations

Theoretical insights into selective extraction of Am(iii) from Cm(iii) and Eu(iii) with asymmetric N-heterocyclic ligands

“…[7][8][9] Separating MA(III) and Ln(III) is a difficult task because they have very similar chemical properties. 10,11 However, separating Am(III) and Cm(III) is even more challenging due to their closely matched sizes and highly comparable chemical characteristics. 8,12 Therefore, compared to the separation of MA(III) and Ln(III), separating Am(III) and Cm(III) is a much more demanding process.…”

Selective Complexation and Separation of Uranium(VI) from Thorium(IV) with New Tetradentate N,O-Hybrid Diamide Ligands: Synthesis, Extraction, Spectroscopy, and Crystallographic Studies

“…13,14 The thorium-uranium extraction (Thorex) process, based on the solvent extraction technique with tri-nbutyl-phosphate (TBP, Figure 1) in a hydrocarbon diluent, represents one of the most promising methods for separating uranium and thorium from fission products and from each other. 8,15 However, it is well known that TBP suffers from drawbacks of high water solubility and formation of the third phase. 16 Elongation of the alkyl chain and introduction of branching on the alkyl chain endow the organophosphorus compounds, e.g., tris-2-ethyl-hexyl phosphate (TEHP) 17,18 and di(1-methyl-heptyl)methyl phosphonate (DMHMP) 7,19 with lower water solubility and a more steric effect upon Th(IV) complexation relative to TBP.…”

“…To address this issue, extensive endeavors have been devoted to uranium/thorium separation, and different technologies have been developed, such as solvent extraction, adsorption, precipitation, ion exchange, etc. Of them, solvent extraction plays a dominating role in the nuclear industry, benefiting from its facile process and high sample throughput. , The thorium-uranium extraction (Thorex) process, based on the solvent extraction technique with tri- n -butyl-phosphate (TBP, Figure ) in a hydrocarbon diluent, represents one of the most promising methods for separating uranium and thorium from fission products and from each other. , However, it is well known that TBP suffers from drawbacks of high water solubility and formation of the third phase . Elongation of the alkyl chain and introduction of branching on the alkyl chain endow the organophosphorus compounds, e.g., tris-2-ethyl-hexyl phosphate (TEHP) , and di­(1-methyl-heptyl)­methyl phosphonate (DMHMP) , with lower water solubility and a more steric effect upon Th­(IV) complexation relative to TBP.…”

Fast and selective reversed-phase high performance liquid chromatographic separation of UO22+ and Th4+ ions using surface modified C18 silica monolithic supports with target specific ionophoric ligands

“…32,33 The classic examples include long-chain amides of n-octyl(phenyl)(N,N-diisobutylcarbamoyl)methyl phosphine oxide (CMPO), tri-butyl phosphate (TBP) and N,N,N,N-tetraoctyl diglycolamide (TODGA) as extractants for the selective recovery of actinide ions from matrix constituents. [34][35][36][37][38] The derivative of TODGA has been extensively used for analyzing the extraction behavior of various f-block elements, as these aliphatic amides were found to bind the targets strongly with reasonable stability. An ion-pair HPLC technique has been reported by Sivaraman et al for the individual isolation of Lns from uranium, plutonium, and other ssion products where the preseparation of Ln-ssion products has been achieved using di-(2ethylhexyl) phosphoric acid coated Amberlite XAD-7 packed bead glass column, using camphor-10-sulfonic acid and a-hydroxy isobutyric acid as the mobile phases.…”