The Extraction of Acitnides and Other Constituents from Highly Active Waste (HAW) by Trialkyl Phosphine Oxide (TRPO)

Studies on uranium(VI) pertraction across a N,N,N′N′-tetraoctyldiglycolamide (TODGA) supported liquid membrane

“…N,N,N ,N -tetraoctyldiglycolamide (TODGA, Fig. 1 [2,3]) appears to be one of the most promising 'green' extractants for trivalent actinide ions and has shown improved performance as compared to carbamoylmethylphosphine oxide (CMPO) [4], tri-n-alkyl phosphine oxide (TRPO) [5] and di-iso-decyl phosphoric acid (DIDPA) [6]. However, though other extractants preferentially extract the hexa-and tetravalent actinide ions as compared to the trivalent ions, TODGA is unique where trivalent actinides are preferentially extracted over other oxidation state ions [7].…”

Studies on hydrolysis and radiolysis of N,N,N′,N′-tetraoctyl-3-oxapentane-1,5-diamide

“…To this end, several extraction processes have been developed, such as American TRUEX process using octyl-(phenyl)-N,N -diisobutylcarbamoylmethylphosphine oxide (CMPO) with tributyl phosphate (TBP) as a phase modifier [1,2]; Chinese TRPO process using trialkylphosphine oxide (TRPO) [3,4]; Japanese DIDPA process using diisodecylphosphoric acid (DIDPA) with TBP [5][6][7]; and French DIAMEX process using N,N -dimethyl-N,N -dibutyltetradecylmalonamide (DMDBTDMA) [8][9][10].…”

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

“…1 H NMR and 13 C NMR spectra were recorded on a BRUKER (400 MHz) spectrometer. 1 H NMR (400 MHz) and 13 Synthesis of p-DGA-benzoic acid (4). To a solution of ester 3 (5.00 g, 8.9 mmol) in a mixture of THF-methanol ¼ 6 : 1 (70 mL) was slowly added NaOH (0.42 g, 10.6 mmol) at 0 C. The mixture was allowed to come to room temperature and was stirred overnight.…”

“…In addition, some of the rare earth elements are also likely to be present. [2][3][4][5] In the present study, the uptake behavior of these metal ions along with Eu(III) (representative of the rare earth elements) was studied from 3 M HNO 3 . The metal ion uptake data show the following trend for resin-I: Eu(III) > Pu(IV) $ Am(III) [ U(VI) > Cs(I) > Sr(II).…”

“…3 Out of the extractants used for the extraction of trivalent actinide ions from acidic feeds, CMPO (carbamoylmethyl phosphine oxide), TRPO (tri-n-alkyl phosphine oxide), malonamides such as DMDBTDMA (N,N,N 0 ,N 0 -dimethyldibutyltetradecyl malonamide) and DMDOHEMA (N,N,N 0 ,N 0 -dimethyldioctylhexylethoxy malonamide), and diglycolamides such as TODGA (N,N,N 0 ,N 0tetra-n-octyl diglycolamide) have been found to be far more efficient than TBP and D2EHPA. [4][5][6][7][8][9][10][11] Though solvent extraction-based separation methods have been used for actinide ion extraction in many radioactive waste remediation related activities, concern for the environment makes one imperative to explore other separation techniques, which are based on low inventory of volatile organic compounds (VOCs). Out of such techniques, solid phase extraction (SPE) has emerged as an excellent separation technique in view of a variety of factors such as low solvent inventory, easy phase sorption and elution, low physical degradation, minimum release of toxic organic solvents, and recycling options.…”