Study on valence of Pu, Np and Tc in nitric acid after electrolytic reduction

Hoshi, Harutaka; Wei, Yuezhou; Kumagai, Mikio; Asakura, Toshihide; Morita, Yasuji

doi:10.1016/j.jallcom.2007.02.060

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…A mixture of technetium species with various oxidation states is formed during the PUREX process. This includes the species with oxidation states of +7 (TcO 4 − ); +4 or +2 [ 4 ] and other unstable soluble species with unclear structure and oxidation state [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3

Chotkowski

2015

J Radioanal Nucl Chem

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The extraction of technetium species at oxidation state lower than +7 has been examined in sulfuric and sulfuric/nitric acid solutions using UV–Vis spectroscopy and optically transparent thin layer cell (RVC-OTTLE). Soluble Tc(III), TcO2+ and [Tc2O2]3+ species with absorption bands at 420–450, 400, and 502 nm, respectively, were detected as products of pertechnetates electroreduction. The distribution ratios of 99Tc with lower than +VII oxidation state ionic species between 4 M H2SO4 and 30 % TBP/kerosene were found and are significantly lower than for TcO4− in the same solution.

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Section: Introductionmentioning

confidence: 99%

Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3

Chotkowski

2015

J Radioanal Nucl Chem

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“…12) At the same time, Np is recovered together with U and/or Pu in the future advanced reprocessing process. 13) Compared with solvent extraction, extraction chromatography that uses a solid-state adsorbent has many attractive advantages, such as no or very limited organic diluent utilization, compact equipment, and less waste accumulation, so that it has a great potential for application in the partitioning of minor actinides. 14) In extraction chromatography, an inert support is impregnated with an organic extractant, either alone, or in combination with a suitable diluent, to produce a solid sorbent, capable of selectively removing certain metal ions from the aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Characteristics of Trivalent Rare Earths and Chemical Stability of a Silica-Based Macroporous TODGA Adsorbent in HNO₃Solution

Wei

LIU

et al. 2011

Journal of Nuclear Science and Technology

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In order to separate trivalent minor actinides (Am and Cm) from high-level liquid waste generated in a nuclear fuel reprocessing process, a silica-based macroporous TODGA (N,N,N 0 ,N 0 -tetraoctyl-3-oxapentane-1,5-diamide) adsorbent (TODGA/SiO 2 -P) was prepared. In this study, the adsorption characteristics of some trivalent rare earths (Y, Nd, and Eu), whose separation behaviors were similar to those of the minor actinides from HNO 3 solution with the TODGA/SiO 2 -P adsorbent, and the chemical stability of the adsorbent against the HNO 3 solution were evaluated experimentally. It was found that the adsorbent exhibited a quite strong adsorption especially for Y(III). The standard enthalpy change for the Y(III) adsorption was determined to be À2:5 kJÁmol À1 using the van't Hoff equation, which indicates that the adsorption was an exothermic reaction. The results of chemical stability experiments showed that the adsorbent had relatively excellent properties in long-time contact with the HNO 3 solution.

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Metallic Technetium, Corrosion, Technetium Alloys and Its Behavior in Spent Nuclear Fuel

Chotkowski

Czerwiński

2021

Monographs in Electrochemistry

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Study on valence of Pu, Np and Tc in nitric acid after electrolytic reduction

Cited by 4 publications

References 13 publications

Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3

Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3

Adsorption Characteristics of Trivalent Rare Earths and Chemical Stability of a Silica-Based Macroporous TODGA Adsorbent in HNO₃Solution

Metallic Technetium, Corrosion, Technetium Alloys and Its Behavior in Spent Nuclear Fuel

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Study on valence of Pu, Np and Tc in nitric acid after electrolytic reduction

Cited by 4 publications

References 13 publications

Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3

Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3

Adsorption Characteristics of Trivalent Rare Earths and Chemical Stability of a Silica-Based Macroporous TODGA Adsorbent in HNO3Solution

Metallic Technetium, Corrosion, Technetium Alloys and Its Behavior in Spent Nuclear Fuel

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Product

Resources

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Adsorption Characteristics of Trivalent Rare Earths and Chemical Stability of a Silica-Based Macroporous TODGA Adsorbent in HNO₃Solution