1
|
Dang AN, Rogalski MH, Pilgrim CD, Wilbanks JR, Peterman DR, Carrie JD, Zalupski PR, Mezyk SP, Horne GP. Radiolytic evaluation of a new technetium redox control reagent for advanced used nuclear fuel separations. Phys Chem Chem Phys 2024; 26:4039-4046. [PMID: 38224090 DOI: 10.1039/d3cp04987f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2024]
Abstract
Technetium is a problematic radioisotope for used nuclear fuel (UNF) and subsequent waste management owing to its high environmental mobility and coextraction in reprocessing technologies as the pertechnetate anion (TcO4-). Consequently, several strategies are under development to control the transport of this radioisotope. A proposed approach is to use diaminoguanidine (DAG) for TcO4- and transuranic ion redox control. Although the initial DAG molecule is ultimately consumed in the redox process, its susceptibility to radiolysis is currently unknown under envisioned UNF reprocessing conditions, which is a critical knowledge gap for evaluating its overall suitability for this role. To this end, we report the impacts of steady-state gamma irradiation on the rate of DAG radiolysis in water, aqueous 2.0 M nitric acid (HNO3), and in a biphasic solvent system composed of aqueous 2.0 M HNO3 in contact with 1.5 M N,N-di-(2-ethylhexyl)isobutyramide (DEHiBA) dissolved in n-dodecane. Additionally, we report chemical kinetics for the reaction of DAG with key transients arising from electron pulse radiolysis, specifically the hydrated electron (eaq-), hydrogen atom (H˙), and hydroxyl (˙OH) and nitrate (NO3˙) radicals. The DAG molecule exhibited significant reactivity with the ˙OH and NO3˙ radicals, indicating that oxidation would be the predominant degradation pathway in radiation environments. This is consistent with its role as a reducing agent. Steady-state gamma irradiations demonstrated that DAG is readily degraded within a few hundred kilogray, the rate of which was found to increase upon going from water to HNO3 containing solutions and solvents systems. This was attributed to a thermal reaction between DAG and the predominant HNO3 radiolysis product, nitrous acid (HNO2), k(DAG + HNO2) = 5480 ± 85 M-1 s-1. Although no evidence was found for the radiolysis of DAG altering the radiation chemistry of the contacted DEHiBA/n-dodecane phase in the investigated biphasic system, the utility of DAG as a redox control reagent will likely be limited by significant competition with its degradation by HNO2.
Collapse
Affiliation(s)
- Anh N Dang
- Department of Chemistry and Biochemistry, California State University Long Beach, 1250 Bellflower Boulevard, Long Beach California, 90840-9507, USA.
| | - Maya H Rogalski
- Department of Chemistry and Biochemistry, California State University Long Beach, 1250 Bellflower Boulevard, Long Beach California, 90840-9507, USA.
| | - Corey D Pilgrim
- Center for Radiation Chemistry Research, Idaho National Laboratory, 1955 N. Freemont Ave., P.O. Box 1625, Idaho Falls, ID, 83415, USA.
| | - Joseph R Wilbanks
- Center for Radiation Chemistry Research, Idaho National Laboratory, 1955 N. Freemont Ave., P.O. Box 1625, Idaho Falls, ID, 83415, USA.
| | - Dean R Peterman
- Center for Radiation Chemistry Research, Idaho National Laboratory, 1955 N. Freemont Ave., P.O. Box 1625, Idaho Falls, ID, 83415, USA.
| | - Jesse D Carrie
- Center for Radiation Chemistry Research, Idaho National Laboratory, 1955 N. Freemont Ave., P.O. Box 1625, Idaho Falls, ID, 83415, USA.
| | - Peter R Zalupski
- Center for Radiation Chemistry Research, Idaho National Laboratory, 1955 N. Freemont Ave., P.O. Box 1625, Idaho Falls, ID, 83415, USA.
| | - Stephen P Mezyk
- Department of Chemistry and Biochemistry, California State University Long Beach, 1250 Bellflower Boulevard, Long Beach California, 90840-9507, USA.
| | - Gregory P Horne
- Center for Radiation Chemistry Research, Idaho National Laboratory, 1955 N. Freemont Ave., P.O. Box 1625, Idaho Falls, ID, 83415, USA.
| |
Collapse
|
2
|
Volkov MA, Novikov AP, Borisova NE, Grigoriev MS, German KE. Intramolecular Re···O Nonvalent Interactions as a Stabilizer of the Polyoxorhenate(VII). Inorg Chem 2023; 62:13485-13494. [PMID: 37599582 DOI: 10.1021/acs.inorgchem.3c01863] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
The first polyoxorhenate(VII) compound, pyrazolium polyoxorhenate ((C4N2H5)2Re4O15), and two new rhenium(VII) and technetium(VII) salts have been synthesized and studied. The structure of Tc2O7 has been reinvestigated. The [Re4O15]2- polyoxoanion contains four Re(VII) atoms: one with an octahedral environment and three with a tetrahedral environment. Polyoxorhenate is formed in the presence of a buffering agent, pyrazole, the latter maintaining pH = 2.5 during the formation of crystals. The [Re4O15]2- polyoxoanion has novel stoichiometry and the cis-conformation, likely due to the stabilizing intramolecular nonvalence interactions. For the first time, intramolecular interactions of the Re···O, Re···μ-O, and O···O are described (previously known were only intermolecular ones). In all of the compounds, intermolecular Re···O interactions are observed, which, however, in other compounds, do not lead to the formation of polyoxometalates. The Hirshfeld surface analysis showed that the main contribution to intermolecular interactions is made by the O···H/H···O contacts, van der Waals interactions of the H···H for cations, and the O···O for anions. DFT calculations of the [Re4O15]2- geometry, compared with the crystallographic data, revealed a deviation in the angles. Mass spectroscopy of the red polyoxometalate [Tc20O68]4- was carried out for the first time. Comparison of the results of MALDI and LI for the first known polyoxometalates of the manganese subgroup made it possible to find general patterns of oligomerization for rhenium and technetium compounds. The ESI-MS and LI-MS methods applied to solution and crystals Re compounds made it possible to prove rhenium being able to form not only [Re4O15]2- but also heavier polyoxoanions.
Collapse
Affiliation(s)
- Mikhail A Volkov
- Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, 31 Bldg 4, Leninsky Prosp., Moscow 119071, Russian Federation
| | - Anton P Novikov
- Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, 31 Bldg 4, Leninsky Prosp., Moscow 119071, Russian Federation
| | - Nataliya E Borisova
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow119991, Russian Federation
| | - Mikhail S Grigoriev
- Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, 31 Bldg 4, Leninsky Prosp., Moscow 119071, Russian Federation
| | - Konstantin E German
- Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, 31 Bldg 4, Leninsky Prosp., Moscow 119071, Russian Federation
| |
Collapse
|
3
|
Ustinov OA, Yakunin SA. Technetium in Gas Emissions of Radioactive Waste Vitrification Technology (Scientific and Technical Information Overview). RADIOCHEMISTRY 2021. [DOI: 10.1134/s1066362221040019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
4
|
German KE, Fedoseev AM, Grigoriev MS, Kirakosyan GA, Dumas T, Den Auwer C, Moisy P, Lawler KV, Forster PM, Poineau F. A 70-Year-Old Mystery in Technetium Chemistry Explained by the New Technetium Polyoxometalate [H 7 O 3 ] 4 [Tc 20 O 68 ] ⋅ 4H 2 O. Chemistry 2021; 27:13624-13631. [PMID: 34245056 DOI: 10.1002/chem.202102035] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Indexed: 11/11/2022]
Abstract
[H7 O3 ]4 [Tc20 O68 ] ⋅ 4H2 O [1] was prepared from an aqueous Tc2 O7 solution concentrated over anhydrous H2 SO4 . [Tc20 O68 ]4- is the first polyanionic species to be reported for Tc. The unit cell contains one centrosymmetric [Tc20 O68 ]4- polyanion as well as hydronium ions and water molecules. The core of the structure consists of four Tc(V)O6 octahedra that form a square Tc4 O4 ring. The four Tc(V)O6 octahedra are decorated by sixteen Tc(VII)O4 tetrahedra. Calculations show the bonding within the Tc4 O4 ring to consist of a 3-center bond formed between each neighboring pair of Tc atoms and their bridging oxygen. Calculations also indicate that a strong d→d electronic transition at 513 nm is the origin of the red color of [1]. The characterization of red HTcO4 solutions by X-ray absorption spectroscopy has complemented the description of this compound in aqueous solution. The formation mechanisms in solution, including the possible role of technetium's radioactivity in the formation of [1], are discussed.
Collapse
Affiliation(s)
- Konstantin E German
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr.31-4, Moscow, Russian Federation
| | - Alexander M Fedoseev
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr.31-4, Moscow, Russian Federation
| | - Mikhail S Grigoriev
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr.31-4, Moscow, Russian Federation
| | - Gayane A Kirakosyan
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr.31-4, Moscow, Russian Federation.,Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Leninsky pr.31, Russian Federation
| | - Thomas Dumas
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | | | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Keith V Lawler
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, NV, 89154, USA
| | - Paul M Forster
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, NV, 89154, USA
| | - Frederic Poineau
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, NV, 89154, USA
| |
Collapse
|
5
|
Kuznetsov VV, Chotkowski M, Poineau F, Volkov MA, German K, Filatova EA. Technetium electrochemistry at the turn of the century. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
6
|
Thevenet A, Miljkovic A, La Cognata S, Marie C, Tamain C, Boubals N, Mangano C, Amendola V, Guilbaud P. Syntheses and evaluation of new hydrophilic azacryptands used as masking agents of technetium in solvent extraction processes. Dalton Trans 2021; 50:1620-1630. [PMID: 33470269 DOI: 10.1039/d0dt04210b] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The extraction of technetium, present in nitric acid medium as pertechnetate anion, is an issue in solvent extraction processes used to recover uranium and plutonium. In the present study, a complexing agent is added in the aqueous nitric acid solution to bind selectively the pertechnetate anion and prevent its extraction into the organic phase or to back extract it in the aqueous phase. Several azacryptands with the addition of hydrophilic groups were synthesized to improve the solubility of the previously studied cage molecule in nitric acid medium. Solvent extraction tests reveal that all the synthesized ligands have a similar complexation strength towards pertechnetate and are able to maintain this anion in the aqueous phase (0.5 M HNO3). These ligands are able to overcome the Hofmeister bias and selectively bind technetium in nitric acid solution. The azacryptand concentration can be increased by a factor of three in the liquid-liquid extraction conditions compared to our previous work. Coordination studies using microcalorimetry, Single Crystal X-Ray Diffraction (SC-XRD), infrared and Raman spectroscopies show the formation of an inclusion complex with hydrogen bonds stabilizing the oxo-anion within the cavity. This solubility improvement is promising for the introduction of this kind of macrocyclic azacryptands in a solvent extraction process.
Collapse
Affiliation(s)
- Alexiane Thevenet
- CEA, DES, ISEC, DMRC, University of Montpellier, Marcoule, F-30207 Bagnols-sur-Cèze, France.
| | - Ana Miljkovic
- Dipartimento di Chimica, Università di Pavia, via Taramelli 12, I-27100 Pavia, Italy and INSTM, via G. Giusti 9, I-50121 Firenze, Italy
| | - Sonia La Cognata
- Dipartimento di Chimica, Università di Pavia, via Taramelli 12, I-27100 Pavia, Italy
| | - Cécile Marie
- CEA, DES, ISEC, DMRC, University of Montpellier, Marcoule, F-30207 Bagnols-sur-Cèze, France.
| | - Christelle Tamain
- CEA, DES, ISEC, DMRC, University of Montpellier, Marcoule, F-30207 Bagnols-sur-Cèze, France.
| | - Nathalie Boubals
- CEA, DES, ISEC, DMRC, University of Montpellier, Marcoule, F-30207 Bagnols-sur-Cèze, France.
| | - Carlo Mangano
- Dipartimento di Chimica, Università di Pavia, via Taramelli 12, I-27100 Pavia, Italy and INSTM, via G. Giusti 9, I-50121 Firenze, Italy
| | - Valeria Amendola
- Dipartimento di Chimica, Università di Pavia, via Taramelli 12, I-27100 Pavia, Italy and INSTM, via G. Giusti 9, I-50121 Firenze, Italy
| | - Philippe Guilbaud
- CEA, DES, ISEC, DMRC, University of Montpellier, Marcoule, F-30207 Bagnols-sur-Cèze, France.
| |
Collapse
|
7
|
Thevenet A, Marie C, Tamain C, Amendola V, Miljkovic A, Guillaumont D, Boubals N, Guilbaud P. Perrhenate and pertechnetate complexation by an azacryptand in nitric acid medium. Dalton Trans 2020; 49:1446-1455. [DOI: 10.1039/c9dt04314d] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Azacryptand addition in nitric acid medium for the recognition of the pertechnetate anion for extraction studies.
Collapse
Affiliation(s)
| | | | | | - Valeria Amendola
- Dipartimento di Chimica Generale
- Universita di Pavia
- I-27100 Pavia
- Italy
| | - Ana Miljkovic
- Dipartimento di Chimica Generale
- Universita di Pavia
- I-27100 Pavia
- Italy
| | | | | | | |
Collapse
|
8
|
Poineau F, Burton-Pye BP, Sattelberger AP, Czerwinski KR, German KE, Fattahi M. Speciation and reactivity of heptavalent technetium in strong acids. NEW J CHEM 2018. [DOI: 10.1039/c7nj04912a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The speciation of Tc(vii) and its reactivity with H2O2, methanol and H2S in H2SO4, HClO4and HNO3is reviewed.
Collapse
Affiliation(s)
- Frederic Poineau
- Department of Chemistry and Biochemistry
- University of Nevada Las Vegas
- Las Vegas
- USA
| | - Benjamin P. Burton-Pye
- Department of Chemistry
- Lehman College of the City University of New York
- USA
- PhD Program in Chemistry
- The Graduate Center of the City University of New York
| | | | | | - Konstantin E. German
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow
- Russian Federation
| | | |
Collapse
|
9
|
Denden I, Roques J, Poineau F, Solari PL, Schlegel ML, Blain G, Fattahi M. Behavior of heptavalent technetium in concentrated triflic acid under alpha-irradiation: technetium-triflate complex characterized by X-ray absorption fine structure spectroscopy and DFT. RADIOCHIM ACTA 2016. [DOI: 10.1515/ract-2016-2603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The nature of the Tc species produced after the alpha-irradiation of Tc(VII) in concentrated triflic acid has been investigated by X-ray absoprtion fine structure (XAFS) spectroscopy and first principles calculations. Experimental and theoretical results are consistent with the formation of Tc(V)O(F3CSO3)2(H2O)2
+.
Collapse
Affiliation(s)
- Ibtihel Denden
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
| | - Jérôme Roques
- IPN Orsay UMR 8608, Université Paris Sud, Bâtiment 100, 91406 Orsay Cedex, France
| | - Frederic Poineau
- Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, NV 89154, United States of America
| | | | - Michel L. Schlegel
- L’Orme des Merisiers, Synchrotron SOLEIL, Saint-Aubin – BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Guillaume Blain
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
| | - Massoud Fattahi
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
| |
Collapse
|
10
|
|