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

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

doi:10.1524/ract.2011.1819

Cited by 6 publications

(3 citation statements)

References 38 publications

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“…5−9 Fragments produced via C−N, C−O, C−H, and C−C bond cleavage in solution were identified for TODGA; 7,8 TEHDGA was shown to be more stable toward radiolysis. 9 It has been demonstrated that studies of the chemistry of gas phase ions can provide insights into condensed phase reaction mechanisms, and intermediates under solvent free conditions. 10,11 Using collision induced dissociation (CID), detailed information on the fragmentation of gas phase metal ion complexes can be obtained.…”

Section: ■ Introductionmentioning

confidence: 99%

Experimental and Theoretical Studies on the Fragmentation of Gas-Phase Uranyl–, Neptunyl–, and Plutonyl–Diglycolamide Complexes

Gong

Rao

et al. 2013

J. Phys. Chem. A

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Fragmentation of actinyl(VI) complexes U(VI)O2(L)2(2+), Np(VI)O2(L)2(2+), and Pu(VI)O2(L)2(2+) (L = tetramethyl-3-oxa-glutaramide, TMOGA) produced by electrospray ionization was examined in the gas phase by collision induced dissociation (CID) in a quadrupole ion trap mass spectrometer. Cleavage of the C-O(ether) bond was observed for all three complexes, with dominant products being U(VI)O2(L)(L-86)(+) with charge reduction, and Np(VI)O2(L)(L-101)(2+) and Pu(VI)O2(L)(L-101)(2+) with charge conservation. The neptunyl and plutonyl complexes also exhibited substantial L(+) loss to give pentavalent complexes Np(V)O2(L)(+) and Pu(V)O2(L)(+), whereas the uranyl complex did not, consistent with the comparative An 5f-orbital energies and the An(VI)O2(2+)/An(V)O2(+) (An = U, Np, Pu) reduction potentials. CID of Np(V)O2(L)2(+) and Pu(V)O2(L)2(+) was dominated by neutral ligand loss to form Np(V)O2(L)(+) and Pu(V)O2(L)(+), which hydrated by addition of residual water in the ion trap; U(V)O2(L)2(+) was not observed. Theoretical calculations of the structures and bonding of the An(VI)O2(L)2(2+) complexes using density functional theory reveal that the metal centers are coordinated by six oxygen atoms from two TMOGA ligands.

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Section: ■ Introductionmentioning

confidence: 99%

Experimental and Theoretical Studies on the Fragmentation of Gas-Phase Uranyl–, Neptunyl–, and Plutonyl–Diglycolamide Complexes

Gong

Rao

et al. 2013

J. Phys. Chem. A

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“… 45 Quite differently, the bistriazinyl pyridine-coated reverse phase column has been used as a stationary phase by Deepika et al to separate uranium, thorium, americium and Lns where nitric acid and α-hydroxy isobutyric acid (α-HIBA) was used as the mobile phases. 46 Furthermore, Raut et al described the RP-HPLC separation of Lns, Th 4+ and UO 2 2+ using n -octane sulfonate as a column modifier that exhibited partial cation exchanger property and hydrophobicity. 47 These methods and processes gave insights into the beautiful separation chemistry of chemically similar f-block elements.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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“…This is also indicated by the large number of publications on newly developed extraction media and processes (e.g., see refs − ). On the other hand, chromatographic separations are being considered again for preparative separation of REEs − beside their classical use as analytical techniques (e.g., see refs − ). In particular, the normal phase chromatographic mode , and ion exchange (IEX) or ion chromatography , have been considered.…”

Section: Introductionmentioning

confidence: 99%

Separation of Lanthanides by Continuous Chromatography

Krättli

Müller‐Späth

Ulmer³

et al. 2013

Ind. Eng. Chem. Res.

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Rare earth elements (REE) are widely used in industrial products, such as magnets, superconductors, and batteries. As the worldwide demand of REEs was increasing drastically during the past decade and the applications require very high purity materials, more efficient purification processes are required. Among the purification methods proposed for REE, chromatography has been considered initially, but was then replaced by extraction in the production scale because of its higher cost. In this work, we investigate the possibility of using continuous countercurrent chromatography to decrease the purification cost. In particular, a model mixture of three REE species (praseodymium, cerium, and lanthanum) has been considered with the aim of purifying all three components in a single step to >95% with high yield. It is found that this performance can be achieved with a yield of 75.4% and a productivity increase of 5 to 15-fold with respect to batch chromatography. However, the productivity value remains too low (approximately 1 g per liter stationary phase and day) for large scale applications. This is due to the low loading caused by the limited solubility of the REE in the adopted buffer used. Possibilities to overcome this limitation are discussed.

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

Cited by 6 publications

References 38 publications

Experimental and Theoretical Studies on the Fragmentation of Gas-Phase Uranyl–, Neptunyl–, and Plutonyl–Diglycolamide Complexes

Experimental and Theoretical Studies on the Fragmentation of Gas-Phase Uranyl–, Neptunyl–, and Plutonyl–Diglycolamide Complexes

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

Separation of Lanthanides by Continuous Chromatography

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

Cited by 6 publications

References 38 publications

Experimental and Theoretical Studies on the Fragmentation of Gas-Phase Uranyl–, Neptunyl–, and Plutonyl–Diglycolamide Complexes

Experimental and Theoretical Studies on the Fragmentation of Gas-Phase Uranyl–, Neptunyl–, and Plutonyl–Diglycolamide Complexes

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

Separation of Lanthanides by Continuous Chromatography

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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