Development of a Selective Americium Separation Process Using H<sub>4</sub>TPAEN as Water-Soluble Stripping Agent

Marie, Cécile; Kaufholz, Peter; Vanel, V.; Duchesne, Marie-Thérèse; Russello, Emilie; Faroldi, Federica; Baldini, Laura; Casnati, Alessandro; Wilden, Andreas; Modolo, Giuseppe; Miguirditchian, Manuel

doi:10.1080/07366299.2019.1643569

Cited by 25 publications

(14 citation statements)

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“…The isolation of americium from lanthanides is of particular interest, as they occur commonly together in nuclear waste and are challenging to separate. 23,24 Using time-resolved laser-induced fluorescence spectroscopy (TRLFS) in combination with the excellent luminescent properties of the two f-block elements Cm and Eu, enables inter-metal competition binding studies regarding the whole lanthanide series and selected An, revealing a relative affinity trend of LanM for the chosen elements.…”

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confidence: 99%

Americium preferred: lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

et al. 2021

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Americium preferred: lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

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“…Meanwhile, R&D is also in progress in the frame of European projects to improve and simplify the EXAm process. New alternative processes based on TODGA-octanol mixture in the organic phase and either TPAEN (N,N, N′,N′-tetrakis[(6-carboxypyridin-2-yl)methyl]ethylenediamine) [60][61][62][63][64][65] or SO 3 -Ph-BTBP (6,6ʹ-bis(5,6-di (3-sulphophenyl)-1,2,4-triazin-3-yl)-2,2ʹ-bipyridine tetrasodium salt) [65][66][67] as selective Am-stripping agent in aqueous phase have been recently assessed and seem to be promising routes for the separation of americium from PUREX raffinates by solvent extraction.…”

Section: Discussionmentioning

confidence: 99%

Americium Recovery from Highly Active PUREX Raffinate by Solvent Extraction: The EXAm Process. A Review of 10 Years of R&D

Miguirditchian

Vanel

Marie

et al. 2020

Solvent Extraction and Ion Exchange

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In the framework of the R&D program conducted in France on partitioning and transmutation of minor actinides, a solvent extraction process was developed for separating americium from a PUREX raffinate arising from the dissolution of spent nuclear fuels in nitric acid. The so-called EXAm process uses a mixture of a malonamide (DMDOHEMA, N,N'-dimethyl-N,N'-dioctyl-hexyloxyethylmalonamide) and HDEHP (di-2-ethylhexylphosphoric acid) in organic phase in combination with a water-soluble complexing agent TEDGA (N,N,N',N'tetraethyldiglycolamide) in aqueous phase to enhance Am/Cm separation. Am/ Ln separation is then obtained by selective Am stripping with polyaminocarboxylic acids (HEDTA or DTPA) buffered by citric or malonic acid at low acidity. Started in 2008, an important R&D program was conducted at CEA to optimize and model the process. The feasibility of the direct recovery of Am from a genuine PUREX raffinate by solvent extraction was demonstrated in 2010 and reported, for the first time in the literature. R&D was then conducted to adapt the process for a future scale-up and for application from concentrated PUREX raffinates. The results of the final EXAm process performed on a highly active PUREX concentrate are presented after a summary of 10 years of R&D on this process development.

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“…commonly together in nuclear waste and are challenging to separate. 23,24 Using time-resolved laser-induced uorescence spectroscopy (TRLFS) in combination with the excellent luminescent properties of the two f-block elements Cm and Eu, enables inter-metal competition binding studies regarding the whole lanthanide series and selected actinides, revealing a relative affinity trend of LanM for the chosen elements.…”

Section: Introductionmentioning

confidence: 99%

Americium preferred: Lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

Singer

Drobot

Zeymer

et al. 2021

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The separation and recycling of lanthanides is an active area of research with a growing demand that calls for more environmentally friendly lanthanide sources. Likewise, the efficient and industrial separation of lanthanides from the minor actinides (Np, Am - Fm) is one of the key questions for closing the nuclear fuel cycle; reducing costs and increasing safety. With the advent of the field of lanthanide dependent bacterial metabolism, bio-inspired applications are in reach. Here, we utilize the natural lanthanide chelator Lanmodulin and the luminescent probes Eu3+ and Cm3+ to investigate the inter-metal competition behavior of all lanthanides (except Pm) and four actinides (Np, Pu, Am, Cm) to Lanmodulin. Using time resolved laser induced fluorescence spectroscopy we show that Lanmodulin has the highest relative binding affinity to Nd3+ and Eu3+ among the lanthanide series. When equimolar mixtures of Cm3+ and Am3+ are added to Lanmodulin, Lanmodulin preferentially binds to Am3+ over Cm3+ whilst Nd3+ and Cm3+ bind with similar relative affinity. The results presented show that a natural lanthanide binding protein can bind various actinides with high relative affinity, paving the way to bio inspired separation applications. In addition, an easy and versatile method was developed, using the fluorescence properties of only two elements, Eu and Cm, for inter-metal competition studies regarding lanthanides and selected actinides and their binding to biological molecules.

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Development of a Selective Americium Separation Process Using H₄TPAEN as Water-Soluble Stripping Agent

Cited by 25 publications

References 35 publications

Americium preferred: lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

Americium preferred: lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

Americium Recovery from Highly Active PUREX Raffinate by Solvent Extraction: The EXAm Process. A Review of 10 Years of R&D

Americium preferred: Lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

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Development of a Selective Americium Separation Process Using H4TPAEN as Water-Soluble Stripping Agent

Cited by 25 publications

References 35 publications

Americium preferred: lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

Americium preferred: lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

Americium Recovery from Highly Active PUREX Raffinate by Solvent Extraction: The EXAm Process. A Review of 10 Years of R&D

Americium preferred: Lanmodulin, a natural lanthanide-binding protein favors an actinide over lanthanides

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Development of a Selective Americium Separation Process Using H₄TPAEN as Water-Soluble Stripping Agent