Studies on Separation of Minor Actinides from Lanthanides from High Level Waste by Extraction Chromatography Using 2,6-Bistriazinyl Pyridine

Deepika, P.; Sabharwal, K. N.; Srinivasan, T. G.; Rao, P. R. Vasudeva

doi:10.13182/nt12-a14172

Cited by 14 publications

(5 citation statements)

References 23 publications

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“…After washing the column with 20 mL of wash solution, the 241 Am fraction from the column was eluted with 0.01 M EDTA. The elution profile of Am was very sharp compared to the rather wide elution curves with long tailings reported previously . The analysis of the Eu fraction (load and washings) showed no detectable 241 Am contamination.…”

Section: Resultsmentioning

confidence: 99%

“…The elution profile of Am was very sharp compared to the rather wide elution curves with long tailings reported previously. 48 The analysis of the Eu fraction (load and washings) showed no detectable 241 Am contamination. However, the 241 Am fraction showed very marginal contamination with the 152 Eu activity, as confirmed by gamma-ray spectrometry (Figure 7).…”

Section: Column Studiesmentioning

confidence: 93%

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First Report on a 1-Cycle Solid-Phase Extraction Method for Selective Separation of Am³⁺ and Eu³⁺: Use of BTP-Grafted Silica Decorated on Activated Carbon

Ansari,

Gujar,

Bhattacharyya

et al. 2024

Ind. Eng. Chem. Res.

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A new composite sorbent material was prepared by grafting bistriazinylpyridine (BTP) onto silica and then blending it with activated charcoal (AC− Si−BTP) for the selective separation of Am 3+ over Eu 3+ using a 1-cycle solid-phase extraction for the direct separation of lanthanides from actinides. BTP was attached to silica via a sulfonamide bond between R−BTP and amino silane, and the resulting Si− BTP was covalently bonded to activated carbon (AC) with a favorable orientation of the ligand coordination sites. The material exhibited a significantly large distribution coefficient for Am 3+ over Eu 3+ at lower acidities (<0.5 M HNO 3 ), and the separation factor between the two metal ions was found to be maximum in 0.2 M HNO 3 with a value of 110. The loading capacity of the material was 4.05 ± 0.12 mg of Eu per gram of the composite when investigated at pH 3. The radiation stability of the material was excellent when studied up to an absorbed dose of 1000 kGy. The material was tested for the separation of Am 3+ and Eu 3+ in a column mode, which gave selective loading of Am 3+ over Eu 3+ . The reusability studies indicated slow leaching of the BTP fraction from the solid, with a resultant decrease of the K d values with time. To address this issue, the material was embedded in polysulfone beads for a separate set of studies, but the separation efficiencies were found to be comparable.

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Section: Resultsmentioning

confidence: 99%

Section: Column Studiesmentioning

confidence: 93%

First Report on a 1-Cycle Solid-Phase Extraction Method for Selective Separation of Am³⁺ and Eu³⁺: Use of BTP-Grafted Silica Decorated on Activated Carbon

Ansari,

Gujar,

Bhattacharyya

et al. 2024

Ind. Eng. Chem. Res.

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“…It is reported that BTP is protonated in the organic phase to > 10% at > 0.2 M HNO 3 in the aqueous phase [39]. In extraction chromatography studies, the distribution ratios for the uptake of Am(III) in the presence of NO − 3 counter-ions decreases for acid concentration > 0.1 M HNO 3 [36], whereas in the absence of the NO 3 − ions, the distribution ratios for Am(III) shows an initial decrease up to 0.1 M HNO 3 , followed by an increase. This result agrees with that observed for the BTP-C 18 column, where the affinity of the column for actinides decreases at lower pH (2.0) of HNO 3 mobile-phase.…”

Section: Nitric Acid Mobile Phasementioning

confidence: 99%

“…2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine (n-Pr-BTP) (Fig. 1) exhibits high separation factors for Am(III)/Eu(III) separation in both solvent extraction [29,31,32] and extraction chromatography methods [35,36]. This particular extractant also exhibits faster kinetics as compared to other BTP analogues [29,30,[32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Separation of lanthanides and actinides on a bistriazinyl pyridine coated reverse phase column

et al. 2011

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The retention behaviour of uranium, thorium, americium and lanthanides has been investigated, using a reverse phase C 18 column modified with 2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine (n-Pr-BTP) with the aim of investigating rapid lanthanide-actinide separations by HPLC technique. Nitric acid and α-hydroxy isobutyric acid (α-HIBA) have been employed as the mobile phase. The influence of mobile phase pH and concentration on the retention of metal ions has been studied. The aim of this study is to investigate the use of BTP coated reverse phase columns as analytical columns for the fast separation of the minor actinides from the lanthanides in the high-level waste (HLW), and to explore whether such columns can be used on a preparative scale for the purification and the recovery of minor actinides from the high-level waste (HLW).It was observed that reverse phase columns modified with BTP showed greater affinity for actinides but exhibited no retention for lanthanides and the lanthanide-actinide separations could be achieved in nitric acid mobile phase, without the need for complexing agents. Americium was separated from the lanthanides with good peak profile and baseline resolution in both nitric acid as well as α-HIBA as the mobile phase. Based on this, the separation of americium from the lanthanides in the HLW was also demonstrated. The retention of a significant amount of thorium by the column in breakthrough studies also indicated that these columns can be used for preparative scale purification of the actinides.

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“…Systems with bis-triazinyl ligands are characterized by low extraction rates, [12][13][14][15][16] which in some cases require the application of interfacial catalysts to accelerate the extraction process. 17,18 For ligands that take a long time to reach equilibrium, utilizing a test-tube experiment to study the kinetics offers a convenient and straightforward approach.…”

Section: Introductionmentioning

confidence: 99%

Kinetic features of solvent extraction by N,O-donor ligands of f-elements: a comparative study of diamides based on 1,10-phenanthroline and 2,2′-bipyridine

Konopkina,

Gopin,

Pozdeev

et al. 2024

Phys. Chem. Chem. Phys.

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Studies on Separation of Minor Actinides from Lanthanides from High Level Waste by Extraction Chromatography Using 2,6-Bistriazinyl Pyridine

Cited by 14 publications

References 23 publications

First Report on a 1-Cycle Solid-Phase Extraction Method for Selective Separation of Am³⁺ and Eu³⁺: Use of BTP-Grafted Silica Decorated on Activated Carbon

First Report on a 1-Cycle Solid-Phase Extraction Method for Selective Separation of Am³⁺ and Eu³⁺: Use of BTP-Grafted Silica Decorated on Activated Carbon

Separation of lanthanides and actinides on a bistriazinyl pyridine coated reverse phase column

Kinetic features of solvent extraction by N,O-donor ligands of f-elements: a comparative study of diamides based on 1,10-phenanthroline and 2,2′-bipyridine

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Studies on Separation of Minor Actinides from Lanthanides from High Level Waste by Extraction Chromatography Using 2,6-Bistriazinyl Pyridine

Cited by 14 publications

References 23 publications

First Report on a 1-Cycle Solid-Phase Extraction Method for Selective Separation of Am3+ and Eu3+: Use of BTP-Grafted Silica Decorated on Activated Carbon

First Report on a 1-Cycle Solid-Phase Extraction Method for Selective Separation of Am3+ and Eu3+: Use of BTP-Grafted Silica Decorated on Activated Carbon

Separation of lanthanides and actinides on a bistriazinyl pyridine coated reverse phase column

Kinetic features of solvent extraction by N,O-donor ligands of f-elements: a comparative study of diamides based on 1,10-phenanthroline and 2,2′-bipyridine

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First Report on a 1-Cycle Solid-Phase Extraction Method for Selective Separation of Am³⁺ and Eu³⁺: Use of BTP-Grafted Silica Decorated on Activated Carbon

First Report on a 1-Cycle Solid-Phase Extraction Method for Selective Separation of Am³⁺ and Eu³⁺: Use of BTP-Grafted Silica Decorated on Activated Carbon