Aminopolycarboxylates in trivalent f-element separations

Zalupski, Peter R.; Grimes, Travis S.; Pilgrim, Corey D.; Heathman, Colt R.; Jansone‐Popova, Santa; Johnson, Katie N.; Bryantsev, Vyacheslav S.; Chapleski, Robert C.

doi:10.1016/bs.hpcre.2021.06.002

Cited by 5 publications

(3 citation statements)

References 421 publications

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Section: Introductionmentioning

confidence: 99%

“…Under moderately acidic conditions, DAG has been shown to facilitate the desired redox control of the aforementioned transuranic ions, in addition to the reduction of the TcO 4 À ion. [33][34][35] This is not the case for other proposed substitutes, such as acetohydroxamic acid (AHA). [36][37][38][39][40][41][42] However, the radiation stability of DAG is currently unknown, and yet is a critical factor in determining the feasibility of any chemical employed in a UNF reprocessing flowsheet.…”

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confidence: 99%

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Radiolytic evaluation of a new technetium redox control reagent for advanced used nuclear fuel separations

Dang,

Rogalski,

Pilgrim

et al. 2024

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Radiolytic evaluation of a new technetium redox control reagent for advanced used nuclear fuel separations

Dang,

Rogalski,

Pilgrim

et al. 2024

Phys. Chem. Chem. Phys.

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“…New reprocessing technologies such as SANEX, GANEX, and TALSPEAK have emerged as potential candidates for the separation of minor actinide elements from the corresponding lanthanide and fission products. ,− Separations following the SANEX and GANEX procedures selectively extract minor actinides from lanthanide elements into the organic phase through the use of ligands based on pyridine − and polypyridine backbones. − These ligands have been targeted as the softer N-donor atom is able to interact more strongly with the 5f orbitals of actinides compared to the 4f orbitals on their lanthanide counterparts. , Following a reverse technique, TALSPEAK selectively extracts all fission products into the organic phase while using a polyaminocarboxylate “hold-back” reagent ,− to keep the minor actinide byproducts in the aqueous phase. As both technologies were primarily developed for An 3+ /Ln 3+ separations, less is known about the interaction of these ligand types with Np in the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Influencing Bonding Interactions of the Neptunyl (V, VI) Cations with Electron-Donating and -Withdrawing Groups

et al. 2023

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Neptunium makes up the largest percentage of minor actinides found in spent nuclear fuel, yet separations of this element have proven difficult due to its rich redox chemistry. Developing new reprocessing techniques should rely on understanding how to control the Np oxidation state and its interactions with different ligands. Designing new ligands for separations requires understanding how to properly tune a system toward a desired trait through functionalization. Emerging technologies for minor actinide separations focus on ligands containing carboxylate or pyridine functional groups, which are desirable due to their high degree of functionalization. Here, we use DFT calculations to study the interactions of carboxylate and polypyridine ligands with the neptunyl cation [Np(V/VI)O2]+/2+. A systematic study is performed by varying the electronic properties of the carboxylate and polypyridine ligands through the inclusion of different electron-withdrawing and electron-donating R groups. We focus on how these groups can affect geometric properties, electronic structure, and bonding characterization as a function of the metal oxidation state and ligand character and discuss how these factors can play a role in neptunium ligand design principles.

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Emerging Rare Earth Element Separation Technologies

Pramanik,

Kaur,

Popovs

et al. 2024

Eur J Inorg Chem

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Rare earth elements are essential for numerous clean energy applications, yet their mining, separation, and processing pose significant environmental challenges. Traditional separation processes often result in ecological damage, highlighting the critical need for innovative techniques that reduce environmental impacts. This article reviews recent advancements in rare earth separation technologies, with a particular focus on the role of neutral organic compounds. It explores how these compounds change selectivity across the rare earth series, offering promising strategies for designing more effective rare earth element separation systems. Furthermore, the article points out research areas requiring additional investigation to improve the sustainability of these critical processes.

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Aminopolycarboxylates in trivalent f-element separations

Cited by 5 publications

References 421 publications

Radiolytic evaluation of a new technetium redox control reagent for advanced used nuclear fuel separations

Radiolytic evaluation of a new technetium redox control reagent for advanced used nuclear fuel separations

Influencing Bonding Interactions of the Neptunyl (V, VI) Cations with Electron-Donating and -Withdrawing Groups

Emerging Rare Earth Element Separation Technologies

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