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Extraction of Np(IV/VI) from nitric acid medium using three different tripodal diglycolamide ligands in ionic liquid: batch extraction, Spectroscopic and electrochemical investigations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Gujar RB, Verma PK, Mahanty B, Bhattacharyya A, Musharaf Ali S, J. M. Egberink R, Huskens J, Verboom W, Mohapatra PK. Sequestration of Np4+ and NpO22+ions by using diglycolamide-functionalized aza-crown ethers in C8mim·NTf2 ionic liquid: Extraction, spectroscopic, electrochemical and DFT studies. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Verma PK, Mohapatra PK. Fate of Neptunium in nuclear fuel cycle streams: state-of-the art on separation strategies. RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2022-0008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Neptunium, with a half life of 2.14 million years is one of the most notorious activation products in the nuclear fuel cycle. It has been more than 5 decades in the reprocessing of nuclear fuels by the well documented PUREX process, but the fate of Np in the PUREX cycle is still not well controlled. Although Np being stable in its pentavalent state in low acid media, its starts to undergo disproportionation at higher acidities. This disproportionation along with the oxidizing conditions of the HNO3 medium makes Np to exits as Np(IV), Np(V) and Np(VI) in the dissolver solution. The overall extractability of Np in the co-decontamination step of the PUREX cycle is dependent on its oxidation state in the medium as Np(VI) and Np(IV) being extractable while Np(V) being least extractable. The present review article discusses about the speciation of Np in HNO3 and its disproportionation. The variety of redox reagents are discussed for their effectiveness towards controlling Np redox behavior in the HNO3 media. The extraction of Np with the different class of extractant has also been discussed and the results are compared for better understanding. Solid phase extraction of Np using both commercially available resin and lab based synthesized resins were discussed. The anion exchange resins with the different cationic centers were shown to behave differently towards the uptake of Np form the acidic medium. The present review also highlight the chemical conditions required for controlling or minimizing the fate of Np in different process streams of the nuclear fuel cycle.
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Affiliation(s)
- Parveen K. Verma
- Radiochemistry Division , Bhabha Atomic Research Centre , Trombay , Mumbai 400085 , India
| | - Prasanta K. Mohapatra
- Radiochemistry Division , Bhabha Atomic Research Centre , Trombay , Mumbai 400085 , India
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