Selective Extraction of Americium(III) over Macroscopic Concentration of Lanthanides(III) by Synergistic System of TPEN and D2EHPA in 1‐Octanol

Watanabe, Masayuki; Mirvaliev, Rinat; Tachimori, Shoichi; Takeshita, Kenji; Nakano, Yoshiaki; Morikawa, Koshi; Chikazawa, Takahiro; Mori, Ryohei

doi:10.1081/sei-120030391

Cited by 33 publications

(15 citation statements)

References 13 publications

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“…We have reported that Am(III) was selectively extracted from the aqueous phase containing Ln(III) by TPEN in nitrobenzene and synergistic system with D2EHPA or decanoic acid in 1-octanol. [5][6][7] TPEN has good selectivity of Am(III) from Ln(III) and has potential to establish partitioning of minor actinides, however, there are several properties that should be improved for the application to the nuclear fuel cycle. The hydrophobicity of TPEN is one of such properties and the extractability of these trivalent metals further increases with decreasing the water solubility.…”

Section: Introductionmentioning

confidence: 99%

Extraction Behavior of Am(III) from Eu(III) with Hydrophobic Derivatives ofN,N,N',N'-tetrakis(2-methylpyridyl)ethylenediamine (TPEN)

Matsumura

Takeshita

2006

Journal of Nuclear Science and Technology

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Section: Introductionmentioning

confidence: 99%

Extraction Behavior of Am(III) from Eu(III) with Hydrophobic Derivatives ofN,N,N',N'-tetrakis(2-methylpyridyl)ethylenediamine (TPEN)

Matsumura

Takeshita

2006

Journal of Nuclear Science and Technology

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“…Recovery of Am from acidic pH solutions (pH 1-6) can be accomplished by extractants such as TTA (2-thenoyltrifluoroacetone), HD2EHP (di-2-ethylhexyl phosphoric acid), and PC88A (2-ethylhexylphosphoric acid mono-2-ethylhexyl ester) which act as acidic chelating extractants displaying high distribution ratio values (1)(2)(3)(4). However, recovery of Am from acidic feeds (particularly, if the acidity is in the range of 1-4 M HNO 3 ) is not possible using these extractants.…”

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confidence: 99%

A Novel Liquid Emulsion Membrane Containing TODGA as the Carrier Extractant for Am Recovery from Acidic Wastes

Kandwal¹,

Mohapatra²

2013

Separation Science and Technology

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The recovery of Am has been investigated by Liquid Emulsion Membrane (LEM) containing 0.1 M N,N,N 0 ,N 0 -tetraoctyl-3-oxapentane diamide (TODGA) þ 0.5 M di-n-hexyloctanamide (DHOA) in n-dodecane as extractant. Span 80 (sorbitan monooleate) was used as the surfactant for making the emulsion while 3 M HNO 3 and 0.1 M acetate buffer (at pH 4.75) were used as the external and internal phases, respectively. Optimized conditions indicated 2% Span 80 was required for making the emulsions. The effect of different experimental conditions such as varying feed acidity, varying volume ratio, different strippants, and varying TODGA concentration have been studied for the quantitative removal of Am from acidic solution. The higher transport rate has been observed which can be attributed to the higher surface area per unit volume available for mass transport. Demulsification was possible by heating the emulsions to 80 C.Actual acidic radioactive waste has also been tested for the recovery of americium. The results show the applicability of ELM for the removal of Am(III) from waste solutions with a faster rate of transport as compared to those reported previously.

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“…Choppin et al 10 reviewed the thermodynamics of synergistic systems and the influence of structural aspects of the complexing extractant agents on the thermodynamic parameters. Many mixed systems involving D2EHPA have been studied for the extraction of rare earths 11–15. For example, Watanabe et al 11 investigated the selective extraction of americium(III) over macroscopic concentration of lanthanoids (III) by the synergistic system of N , N , N ′, N ′‐ tetrakis(2‐methylpyridyl)‐ethylenediamine (TPEN) and D2EHPA in 1‐octanol.…”

Section: Introductionmentioning

confidence: 99%

Studies on the solvent extraction of rare earths from nitrate media with a combination of di‐(2‐ethylhexyl)phosphoric acid and sec‐octylphenoxyacetic acid

Jia

Zhou

et al. 2008

J of Chemical Tech & Biotech

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BACKGROUND: Di-(2-ethylhexyl)phosphoric acid (D2EHPA, H 2 A 2 ) has been used extensively in hydrometallurgy for the extraction of rare earths, but it has some limitations. Synergistic extraction has attracted much attention because of its enhanced extractabilities and selectivities. In the present study, sec-octylphenoxyacetic acid (CA12, H 2 B 2 ) was added into D2EHPA systems for the extraction and separation of rare earths. The extraction mechanism of lanthanum with the mixtures and the separation of lanthanoids and yttrium were investigated.

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Selective Extraction of Americium(III) over Macroscopic Concentration of Lanthanides(III) by Synergistic System of TPEN and D2EHPA in 1‐Octanol

Cited by 33 publications

References 13 publications

Extraction Behavior of Am(III) from Eu(III) with Hydrophobic Derivatives ofN,N,N',N'-tetrakis(2-methylpyridyl)ethylenediamine (TPEN)

Extraction Behavior of Am(III) from Eu(III) with Hydrophobic Derivatives ofN,N,N',N'-tetrakis(2-methylpyridyl)ethylenediamine (TPEN)

A Novel Liquid Emulsion Membrane Containing TODGA as the Carrier Extractant for Am Recovery from Acidic Wastes

Studies on the solvent extraction of rare earths from nitrate media with a combination of di‐(2‐ethylhexyl)phosphoric acid and sec‐octylphenoxyacetic acid

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