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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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The simulation of a green room-temperature ternary solution of water, methanol and 1-ethyl-3-methyl imidazolium chloride by all-atom Monte Carlo and DFT computational approaches. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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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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Rao CV, Rout A, Venkatesan KA. Aggregation behavior of ionic liquid in molecular liquid medium: a dynamic light scattering study. SEP SCI TECHNOL 2021. [DOI: 10.1080/01496395.2020.1734621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Ch. Venkateswara Rao
- Training School Complex, Homi Bhabha National Institute, Mumbai, India
- Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - Alok Rout
- Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - K. A. Venkatesan
- Training School Complex, Homi Bhabha National Institute, Mumbai, India
- Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
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Verma PK, Mahanty B, Gujar RB, Mohapatra PK. Neptunium – Tri-n-butyl phosphate complexes in room temperature ionic liquids: Extraction and spectroelectrochemical studies. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Verma PK, Gujar RB, Mahanty B, Leoncini A, Huskens J, Verboom W, Mohapatra PK. Sequestration of tetravalent neptunium from acidic feeds using diglycolamide-functionalized dendrimers in a room temperature ionic liquid: extraction, spectroscopic and electrochemical studies. NEW J CHEM 2021. [DOI: 10.1039/d1nj03098a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Extraction of Np(iv) was studied using RTIL containing two poly(propyleneimine) based dendrimer ligands from HNO3 solutions. Studies of the extracted complexes were also carried out by Vis-NIR and cyclic voltammetry.
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Affiliation(s)
- Parveen K. Verma
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai – 400 085, India
| | - Rajesh B. Gujar
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai – 400 085, India
| | - Bholanath Mahanty
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai – 400 085, India
| | - Andrea Leoncini
- Laboratory of Molecular Nanofabrication, MESA + Institute for Nanotechnology, University of Twente, P. O. Box 217, 7500 AE Enschede, The Netherlands
| | - Jurriaan Huskens
- Laboratory of Molecular Nanofabrication, MESA + Institute for Nanotechnology, University of Twente, P. O. Box 217, 7500 AE Enschede, The Netherlands
| | - Willem Verboom
- Laboratory of Molecular Nanofabrication, MESA + Institute for Nanotechnology, University of Twente, P. O. Box 217, 7500 AE Enschede, The Netherlands
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Gujar RB, Mohapatra PK, Verboom W. Extraction of Np4+ and Pu4+ from nitric acid feeds using three types of tripodal diglycolamide ligands. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116986] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Mahanty B, Verma PK, Mohapatra PK. Extraction of Some Actinide Ions from Nitric Acid Feeds Using N, N-di-n-hexyloctanamide (DHOA) in an Ionic Liquid. J SOLUTION CHEM 2020. [DOI: 10.1007/s10953-020-00970-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Iqbal M, Waheed K, Rahat SB, Mehmood T, Lee MS. An overview of molecular extractants in room temperature ionic liquids and task specific ionic liquids for the partitioning of actinides/lanthanides. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07199-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Gujar RB, Verma PK, Mahanty B, Ansari SA, Goswami D, Mohapatra PK. Comparative evaluation of extraction of tetra- and hexa-valent neptunium ions by CMPO in a room temperature ionic liquid. SEP SCI TECHNOL 2019. [DOI: 10.1080/01496395.2019.1641520] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Rajesh B. Gujar
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Parveen K. Verma
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Bholanath Mahanty
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Seraj A. Ansari
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
- Homi Bhabha National Institute, Mumbai, India
| | - Dibakar Goswami
- Homi Bhabha National Institute, Mumbai, India
- Bioorganic Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Prasanta K. Mohapatra
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
- Homi Bhabha National Institute, Mumbai, India
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