Novel Extractant, NTAamide, and its Combination with TEDGA for Mutual Separation of Am/Cm/Ln

Sasaki, Yoshiyuki; Tsubata, Yasuhiro; Kitatsuji, Yoshihiro; Sugo, Yumi; Shirasu, Noriko; Morita, Yasuji

doi:10.1080/07366299.2013.836422

Cited by 52 publications

(30 citation statements)

References 32 publications

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“…In our previous studies using the n ‐octyl derivative (HONTA), we observed that both Am 3+ and Eu 3+ were extracted as 1 : 2 complexes from 0.1 M HNO 3 . Sasaki et al., however, reported that Am 3+ was extracted as 1 : 2 complex, whereas Eu 3+ was extracted as a 1 : 1 complex from 0.2 M HNO 3 and upon increasing the aqueous phase nitric acid concentration to 1 M, both the metal ions were extracted as 1 : 1 complex which could be due to the stronger competition from the nitrate ion at higher nitrate concentration. The presence of a 1 : 1 complex during the extraction of Eu 3+ by H2EHNTA is in line with the observation from the luminescence studies in methanol medium where it is clear that the tendency to form a 1 : 2 complex is lower in this branched alkyl chain HRNTA derivative.…”

Section: Resultsmentioning

confidence: 91%

“…Single‐phase complexation studies in a methanol‐water (1 : 1) mixture also showed the formation of only 1 : 1 complexes of Eu 3+ for all the HRNTA derivatives . Sasaki et al . have also reported varying metal‐ligand stoichiometries in the extracted complexes of HONTA in n ‐dodecane medium.…”

Section: Introductionmentioning

confidence: 94%

“…N,N,N′,N′,N“,N” ‐hexa‐ n ‐octylnitrilotriacetoamide (HONTA) was explored in detail by Sasaki et al. for An/Ln separations …”

Section: Introductionmentioning

confidence: 99%

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Combined Experimental and Density Functional Theoretical Studies of Am³⁺ and Eu³⁺ Extraction and Complexation with Different Nitrilotriacetamide (NTA) Derivatives

et al. 2020

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N,N,N′,N′,N“,N”‐hexaalkylnitrilotriacetoamide (HRNTA) derivatives were found to be promising for the separation of trivalent actinides from lanthanides, which is a burning topic in the back end of the nuclear fuel cycle. In the present work, separation of Am3+ from Eu3+ was studied using the N,N,N’,N’,N’’,N’’‐hexa‐2‐ethylhexylnitrilotriacetamide (H2EHNTA) derivative and the role of the diluent medium to control the extractable complex was demonstrated. The effect of alkyl chain length and branching in the alkyl chain of different HRNTA (R=methyl, n‐butyl, n‐hexyl, n‐dodecyl and 2‐ethylhexyl) derivatives on their complexation with Eu3+ were investigated using steady‐state and time‐resolved luminescence studies. Different species formed at different ligand to metal ratios were identified from the luminescence titration experiments and their lifetime values measured. The experimental results were corroborated with the help of density functional theoretical (DFT) calculations on Am3+ and Eu3+ complexes of HRNTA derivatives with varying alkyl chain length and branching.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 94%

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Combined Experimental and Density Functional Theoretical Studies of Am³⁺ and Eu³⁺ Extraction and Complexation with Different Nitrilotriacetamide (NTA) Derivatives

et al. 2020

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“…[21] Two interesting derivatives of the EXAm process also have been described recently. [22,23] Downloaded by [New York University] at 12:21 03 August 2015 However, the single stage Cm/Am separation factors of these separations are either small, [21,23] so many individual extraction stages are required to achieve the separation, or the distribution ratios show a strong acid dependence. [22] Additionally, the EXAm process requires a second An/Ln separation to separate Am from the light lanthanides (La-Nd).…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction Separation of Trivalent Americium from Curium and the Lanthanides

Jensen

Chiarizia

Ulicki

et al. 2015

Solvent Extraction and Ion Exchange

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The sterically constrained, macrocyclic, aqueous soluble ligand N,N -bis[(6-carboxy-2-pyridyl)methyl]-1,10-diaza-18-crown-6 (H 2 BP18C6) was investigated for separating americium from curium and all the lanthanides by solvent extraction. Pairing H 2 BP18C6, which favors complexation of larger f-element cations, with acidic organophosphorus extractants that favor extraction of smaller f-element cations, such as bis-(2-ethylhexyl)phosphoric acid (HDEHP) or (2-ethylhexyl)phosphonic acid mono(2-ethylhexyl) ester (HEH[EHP]), created solvent extraction systems with good Cm/Am selectivity, excellent trans-lanthanide selectivity (K ex,Lu /K ex,La = 10 8 ), but poor selectivity for Am against the lightest lanthanides. However, using an organic phase containing both a neutral extractant, N,N,N',N'-tetra(2-ethylhexyl)diglycolamide (TEHDGA), and HEH[EHP] enabled rejection of the lightest lanthanides during loading of the organic phase from aqueous nitric acid, eliminating their interference in the americium stripping stages. In addition, although it is a macrocyclic ligand, H 2 BP18C6 does not significantly impede the mass transfer kinetics of the HDEHP solvent extraction system.

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“…Recently, N,N,N',N',N'',N''-hexaalkyl-nitrilotriacetamide (NTAamide) has been developed for the separation of not only actinides and lanthanides but also Am and Cm [15][16]. NTAamide is a promising extractant for use in the partitioning process.…”

Section: Introductionmentioning

confidence: 99%

Masking Effects for Mo, Re, Pd and Ru by S and N-Donor Reagents through MIDOA and Ntaamide Extraction

Sasaki

Morita

Shimazaki

et al. 2016

SERDJ

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In this study, we examined the masking effects of 16 water-miscible reagents, on the extraction of Mo, Re, Ru, and Pd. These reagents included soft N-and/or S-donor atoms in their structures and they function as multidentate ligands. The extractants, methylimino-N,N-dioctylacetamide (MIDOA) and N,N,N',N',N'',), show significantly high distribution ratios for these metals(D(M)), were employed in this study. Masking effects were observed as a decrease in D(M) with an increase of masking agent concentration in these extraction systems. The results showed that D(Pd) can be considerably decreased by the addition of thiourea, cysteine, cysteamine, trisaminoethylamine, and diethylenetriamine, and D(Ru) is decreased by the addition of thiourea, trisaminoethylamine, and diethylenetriamine. Pd and Ru can be masked by similar reagents including N-or S-donor atoms, which suppressed the extraction into the organic phase. In contrast, D(Mo) was only slightly masked by the above-mentioned reagents. The masking of Mo was achieved using methylimino-N,N'-diethylacetamide, hexaethyl-nitrilotriacetamide, iminodiacetic acid, and iminodimethylphosphonic acid, which have a central N(CH 2 C(P)=O) 2 framework that is important for this purpose. A masking agent for Re was not found in this study.

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Novel Extractant, NTAamide, and its Combination with TEDGA for Mutual Separation of Am/Cm/Ln

Cited by 52 publications

References 32 publications

Combined Experimental and Density Functional Theoretical Studies of Am³⁺ and Eu³⁺ Extraction and Complexation with Different Nitrilotriacetamide (NTA) Derivatives

Combined Experimental and Density Functional Theoretical Studies of Am³⁺ and Eu³⁺ Extraction and Complexation with Different Nitrilotriacetamide (NTA) Derivatives

Solvent Extraction Separation of Trivalent Americium from Curium and the Lanthanides

Masking Effects for Mo, Re, Pd and Ru by S and N-Donor Reagents through MIDOA and Ntaamide Extraction

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Novel Extractant, NTAamide, and its Combination with TEDGA for Mutual Separation of Am/Cm/Ln

Cited by 52 publications

References 32 publications

Combined Experimental and Density Functional Theoretical Studies of Am3+ and Eu3+ Extraction and Complexation with Different Nitrilotriacetamide (NTA) Derivatives

Combined Experimental and Density Functional Theoretical Studies of Am3+ and Eu3+ Extraction and Complexation with Different Nitrilotriacetamide (NTA) Derivatives

Solvent Extraction Separation of Trivalent Americium from Curium and the Lanthanides

Masking Effects for Mo, Re, Pd and Ru by S and N-Donor Reagents through MIDOA and Ntaamide Extraction

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Product

Resources

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Combined Experimental and Density Functional Theoretical Studies of Am³⁺ and Eu³⁺ Extraction and Complexation with Different Nitrilotriacetamide (NTA) Derivatives

Combined Experimental and Density Functional Theoretical Studies of Am³⁺ and Eu³⁺ Extraction and Complexation with Different Nitrilotriacetamide (NTA) Derivatives