Radiochemistry

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Extraction Properties of Bis(diphenylphosphinylethyl)phosphinic Acid in Nitric Acid Solutions
Radiochemistry - Tập 47 - Trang 278-283 - 2005
A. N. Turanov, V. K. Karandashev, V. V. Ragulin
Extraction of microamounts of U(VI), Th(IV), Sc(III), and Ln(III) from HNO3 solutions with solutions of bis(diphenylphosphinylethyl)phosphinic acid in dichloroethane was studied. The stoichiometry of the extractable complexes was determined, and the effect of the inorganic anion and organic diluent on the extraction of rare-earth elements was examined. An increase in the number of phosphoryl group...... hiện toàn bộ
Radium in the Radium Institute
Radiochemistry - - 2009
V. N. Romanovskii, E. A. Shashukov
A Chemometric Study of the Adsorption of Zr(IV) Ions from Aqueous Solutions onto TBP-Surface-Modified Magnetic Fe3O4 Nanoparticles as a New Adsorbent
Radiochemistry - Tập 62 - Trang 62-72 - 2020
A. R. Behnam-Saba, K. Saberyan, A. Nezhadali, H. Adelkhani
Chemometric experimental design methods were used to optimize the adsorption of Zr(IV) ions from an aqueous solution. Tributyl phosphate functionalized magnetic nanoparticles (TBPFMNPs) were used as a novel adsorbent for the adsorption of Zr(IV) ions. The effect exerted on the adsorption process by the adsorbent amount (mg), TBP/MNP ratio (w/w, %), and concentration of Zr(IV) in aqueous solutions ...... hiện toàn bộ
Gas-Phase Volume Oxidation of Uranium Mononitride
Radiochemistry - Tập 61 - Trang 146-155 - 2019
S. A. Kulyukhin, Yu. M. Nevolin, A. V. Gordeev, A. A. Bessonov
Gas-phase volume oxidation (voloxidation) of UN in various atmospheres was studied. Oxidation of compact UN samples under the conditions characteristic of the voloxidation of the oxide fuel leads to the formation of uranium oxides. The use of the oxygen-containing atmosphere leads to the predominant formation of U3O8, and the use of water vapor, to the formation of UO2. The major gaseous nitrogen-...... hiện toàn bộ
Heterogeneous Equilibria in Saturated Aqueous Solutions of Uranophane-Kasolite Group Uranosilicates
Radiochemistry - Tập 47 - Trang 358-364 - 2005
N. G. Chernorukov, O. V. Nipruk, A. V. Knyazev, E. Yu. Strakhova
The composition of mineral-like uranosilicates of uranophane-kasolite group in saturated aqueous solutions at 25°C was studied, and a quantitative physicochemical model of the heterogeneous system crystalline uranosilicate-aqueous solution was developed. The equilibrium constants of dissolution and standard Gibbs energies of formation of compounds studied were calculated. The model developed was u...... hiện toàn bộ
Immobilization of U, Ra, and Th compounds with analcime-containing rock and hydrolysis lignin
Radiochemistry - Tập 53 - Trang 314-321 - 2011
N. G. Rachkova, A. I. Taskaev
The capability of wood hydrolysis lignin and analcime-containing rock for immobilization of U, Ra, and Th from aqueous solutions of their salts and radioactively contaminated podzol soil was evaluated. The influence of pH and mineralization of the liquid phase on the uptake efficiency was examined. The sorption mechanisms were identified using sequential leaching procedure and IR spectroscopy. The...... hiện toàn bộ
Behavior of plutonium in various oxidation states in aqueous solutions: II. Behavior of Pu(V) and Pu(III) at concentrations of 10−5–10−8 M in solutions at pH ∼8
Radiochemistry - - 2010
Yu. M. Kulyako, Т. И. Трофимов, Д. А. Маликов, С. А. Перевалов, M. D. Samsonov, С. Е. Винокуров, Β. F. Myasoedov
Synthesis and study of uranosilicates of the uranophane-kasolite group
Radiochemistry - Tập 49 - Trang 340-345 - 2007
N. G. Chernorukov, A. V. Knyazev, O. V. Nipruk
A series of uranosilicates of alkali (Li, Na, K, Rb, Cs, NH4), alkaline-earth (Mg, Ca, Sr, Ba), and rare-earth (Y, La, Ln) elements were prepared by precipitation from a solution under hydrothermal conditions. The composition and structure of the compounds were examined by X-ray diffraction analysis, IR spectroscopy, and thermal analysis. It was established that these compounds belong to the urano...... hiện toàn bộ
A comparative study of the chemical properties of element 120 and its homologs
Radiochemistry - Tập 55 - Trang 461-465 - 2013
Yu. A. Demidov, A. V. Zaitsevskii
The electronic structure and energetics were calculated for molecules of binary compounds of element 120 and its homologs with common elements strongly differing in chemical properties. The calculations were performed within the framework of the relativistic density functional theory using the model of precision two-component atomic core pseudopotentials. The results obtained show that all the exa...... hiện toàn bộ
Above-Extreme Extraction Mode in the Purex Process: 1. Calculation of the Pu and U Distribution in the Head Extractor
Radiochemistry - Tập 43 - Trang 562-568 - 2001
Yu. S. Fedorov, B. Ya. Zilberman, E. A. Puzikov, E. N. Mishin
Accumulation of Pu(IV) in head extractors of the mixer-settler type as applied to two different flowsheets of NPP spent fuel reprocessing was simulated under dynamic and steady-state conditions using a mathematical model of extraction. Comparison of the calculations showed that the maximal accumulation of Pu in the head extractor is independent of the calculation procedure and is determined by the...... hiện toàn bộ
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