Rajesh B. Gujar

Bhabha Atomic Research Centre

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Prasanta K. Mohapatra

Bhabha Atomic Research Centre

Seraj A. Ansari

Bhabha Atomic Research Centre

Willem Verboom

University of Twente

Parveen K. Verma

Bhabha Atomic Research Centre

Jurriaan Huskens

University of Twente

Richard J. M. Egberink

University of Twente

VΚ

V. Κ. Manchanda

Indian Cancer Society

Raj B. Bhatt

Center for Discovery

Akalesh G. Yadav

Homi Bhabha National Institute

P. N. Pathak

Amity University

Cooperative Institutions

Bhabha Atomic Research Centre

Homi Bhabha National Institute

University of Mumbai

Bhabha Atomic Research Center Hospital

Indira Gandhi Centre for Atomic Research

Toowoomba Hospital

University of Twente

Institute of Nanotechnology

Indian Institute of Technology Madras

Central Salt and Marine Chemicals Research Institute

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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

Journal of Molecular Liquids (2022)

Rajesh B. Gujar Parveen K. Verma Bholanath Mahanty Andrea Leoncini Jurriaan Huskens

Nitric acid

C4mim

10.1016/j.molliq.2022.120922

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Citations (2)

Extraction of some Hexavalent Actinide Ions from Nitric Acid Medium using Several Substituted Diglycolamides

Solvent Extraction and Ion Exchange (2014)

Rajesh B. Gujar P. N. Pathak G. B. Dhekane Prasanta K. Mohapatra

Several substituted diglycolamides, namely TPDGA, THDGA, TODGA, and TDDGA, were evaluated in a comparative study on the extraction of hexavalent actinide ions such as UO22+, NpO22+, and PuO22+ from nitric acid medium. The acid extraction constants (KH) for the diglycolamides were determined to be 3.8 ± 0.6, 1.6 ± 0.1, 4.1 ± 0.4, and 1.4 ± 0.2 for TPDGA, THDGA, TODGA, and TDDGA, respectively. Though metal ion extraction generally increased with increasing the feed acid concentration, the nature of the extracted species changed with aqueous-phase acidity. While complexes of the type MO2(NO3)2·nL (where L is the diglycolamide extractant and n is 1 and 2) were found to be extracted at 1 M HNO3, the average number of ligand molecules associated with the complex decreased to ˜1 when the nitric acid concentration increased to 3 M. These results have great significance from the actinide separation point of view, as the actinides ions can be made virtually inextractable by adjusting their oxidation state. The thermodynamic parameters were also calculated, which indicated spontaneous reactions with large exothermicities.

Nitric acid

10.1080/07366299.2014.926136

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Citations (18)

Sequestration of Np4+ and NpO22+ ions by using diglycolamide-functionalized azacrown ethers in C8mim·NTf2 ionic liquid: Extraction, spectroscopic, electrochemical and DFT studies

Journal of Molecular Liquids (2022)

Rajesh B. Gujar Parveen K. Verma Bholanath Mahanty Arunasis Bhattacharyya Sk. Musharaf Ali

Diluent

Nitric acid

10.1016/j.molliq.2022.120872

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Citations (7)

Extraction of Eu(III) and Am(III) by 1-phenyl-3-methyl-4-acetylpyrazol-5-one (HPMAP) and tri-n-octylphosphine oxide (TOPO) in a room-temperature ionic liquid

Separation Science and Technology (2017)

Rajesh B. Gujar Arijit Sengupta Mallekav S. Murali Prasanta K. Mohapatra

Extraction behaviour of trivalent americium and europium was investigated with 1-phenyl-3-methyl-4-acetyl-5-pyrazolone (HPMAP) and tri-n-octylphosphine oxide (TOPO) in a room-temperature ionic liquid, 1-methyl-3-octyl-imidazolium bis(trifluoromethylsulphonyl) imide (C8mim·Tf2N). In select cases, comparison was made using xylene, a molecular diluent. For binary extraction studies involving only PMAP, Eu3+ was marginally better extracted than Am3+ and the species extracted into C8mim·Tf2N conformed to species of the type M(PMAP)3 (where M = Am or Eu). On the other hand, cationic species were extracted for the ternary extraction systems involving HPMAP and TOPO. Luminescence spectroscopic studies suggested no inner-sphere water molecules in the extracted species. The luminescence decay lifetime showed mono-exponentials, suggesting the extraction of single species.

Europium

Cationic polymerization

Diluent

Imide

10.1080/01496395.2017.1282966

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Citations (10)

Effect of irradiation on the hydrodynamic parameters and extraction efficiency of several frequently used ionic liquids

Radiation Physics and Chemistry (2019)

Parveen K. Verma Rajesh B. Gujar A. S. Kanekar Y. K. Bhardwaj Prasanta K. Mohapatra

Nitric acid

10.1016/j.radphyschem.2019.02.028

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Citations (12)

Understanding the effect of alkyl chain on extraction of Np4+ and Pu4+ with hexaalkyl nitrilotriacetamides into an ionic liquid vis-à-vis a molecular solvent

Progress in Nuclear Energy (2024)

Rajesh B. Gujar Seraj A. Ansari Prasanta K. Mohapatra Richard J. M. Egberink Willem Verboom

Chain (unit)

10.1016/j.pnucene.2024.105455

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Citations (0)

Remarkable Improvement in Am³⁺ and Cm³⁺ Separation Using a Cooperative Counter Selectivity Strategy by a Combination of Branched Diglycolamides and Hydrophilic Polyaza-heterocycles

Inorganic Chemistry (2024)

Rajesh B. Gujar A. S. Kanekar Arunasis Bhattacharyya N.S. Karthikeyan Cingaram Ravichandran

Separation of Am

Separation (statistics)

10.1021/acs.inorgchem.4c01081

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Citations (3)

Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

Radiochimica Acta (2021)

Rajesh B. Gujar Parveen K. Verma Prasanta K. Mohapatra Mudassir Iqbal Jurriaan Huskens

Abstract Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np 4+ and NpO 2 2+ was studied using three multiple diglycolamide (DGA) extractants with n -propyl, n -octyl and 3-pentyl substituents termed as L I , L II and L III , respectively, in a mixed diluent of 5% isodecanol and 95% n -dodecane. For comparison purpose, the extraction of Pu 4+ and UO 2 2+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: L II > L I > L III , which changed to L III > L II > L I for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10 −5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu 4+ was better extracted than Np 4+ , while NpO 2 2+ was marginally better extracted then UO 2 2+ . A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO 3 ) 4 ·mL and MO 2 (NO 3 ) 2 ·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

Nitric acid

Neptunium

Diluent

10.1515/ract-2020-0100

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Citations (6)

Comparative uptake studies on trivalent f-cations from acidic feeds using two extraction chromatography resins containing a diglycolamide in molecular diluent and ionic liquid

Journal of Chromatography A (2021)

Rajesh B. Gujar Akalesh G. Yadav Prasanta K. Mohapatra T.P. Valsala Darshan B. Sathe

Diluent

10.1016/j.chroma.2021.461999

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