I. A. Rumer
Russian Academy of Sciences
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Featured researches published by I. A. Rumer.
Radiochemistry | 2008
S. A. Kulyukhin; E. P. Krasavina; I. V. Gredina; I. A. Rumer; L. V. Mizina
Sorption of 137Cs, 85,90Sr, and 90Y from aqueous solutions on the solid phase of layered double hydroxides (LDHs) and layered double oxides (LDOs) of various compositions was studied. On the solid phase of Mg-Al and Cu-Al LDHs and Mg-Al LDO, the Sr and Cs radionuclides are very weakly sorbed from aqueous solutions containing 10−5 M of the corresponding element (Cs+ or Sr2+). Introduction of EDTA ions into Mg-Al LDH increases the distribution coefficients Kd of Sr by a factor of more than 40. After 96-h contact of the solid and liquid phases, Kd of radioactive Sr in sorption from aqueous solution on Mg-Al LDH and Mg-Al LDH-EDTA is 2.4 and 100 ml g−1, respectively. The Sr and Y radionuclides are efficiently sorbed from aqueous solutions containing 10−5 M Sr2+ and Y3+ on the Mg-Nd LDH solid phase. After 5-min contact of the solid and liquid phases, Kd of Sr exceeds 105 ml g−1. For Y, the distribution coefficients equal to 700–800 ml g−1 are attained after 30-min contact of the solid and liquid phases. Aging of the Mg-Nd LDH precipitate does not affect its sorption properties toward Sr and Y radionuclides. With an increase in the Sr(NO3)2 concentration in the solution from 10−5 to 10−1 M, the distribution coefficients Kdz of Sr drastically decrease (virtually to zero) and those of Y change insignificantly.
Radiochemistry | 2010
S. A. Kulyukhin; E. P. Krasavina; I. A. Rumer; I. V. Gredina
Sorption of 60Co from aqueous solutions of various compositions on layered double hydroxides (LDHs) of Mg, Al, and Nd in carbonate and hydroxide forms and on layered double oxides (LDOs) of Mg and Al was studied. 60Co is poorly sorbed from aqueous nitrate solutions onto LDH-Mg-Al-OH. The 60Co distribution coefficient Kd does not exceed 50 ml g−1 at a phase contact time of 15 min and V/m = 50 ml g−1. At the same time, 60Co is efficiently sorbed from 10−3–10−5 M aqueous Co(NO3)2 solutions onto LDH-Mg-Al and LDH-Mg-Nd with CO32− in the interlayer space. At a phase contact time of 15 min and V/m = 50 ml g−1, Kd exceeds 2 × 104 ml g−1 for LDH-Mg-Nd and does not exceed 5 × 103 ml g−1 for LDH-Mg-Al. The 60Co desorption from LDH-Mg-Nd-CO3 into 0.05–0.2 M solutions of Na2CO3, NaNO3, (NH4)2C2O4, and Na2H2EDTA and into distilled water was studied. Na2H2EDTA is the most efficient desorbing agent. After 15-min contact of LDHMg(60Co)-Nd-CO3 with 0.1 and 0.05 M Na2H2EDTA solutions, the degree of desorption of 60Co is ∼100 and ∼99%, respectively.
Radiochemistry | 2007
S. A. Kulyukhin; E. P. Krasavina; I. A. Rumer; L. V. Mizina; N. A. Konovalova
Sorption of 131I− and 131IO3− from aqueous solutions at 300 K on solid layered double magnesium aluminum hydroxides (Mg-Al-LDH) in the carbonate (Mg-Al-LDH-CO3) and nitrate (Mg-Al-LDH-NO3) forms was studied. The distribution coefficients of 131I− and 131IO3− between solid Mg-Al-LDH-CO3 and an aqueous solution after contact of these phases for 60 min are 38 and 34 ml g−1, respectively. The distribution coefficients of 131I− and 131IO3− between solid Mg-Al-LDH-NO3 and an aqueous solution, measured under the similar conditions, are about 5 ml g−1. After contact of the solid and liquid phases for 14 h, the distribution coefficients of 131I− and 131IO3− between an aqueous phase and solid layered double magnesium aluminum oxides (Mg-Al-LDO) prepared by thermolysis of Mg-Al-LDH are 7999 and 7068 ml g−1, respectively.
Radiochemistry | 2009
S. A. Kulyukhin; A. N. Kamenskaya; I. A. Rumer
Products of UO2(NO3)2·6H2O decomposition under the action of microwave radiation (MWR) were studied by thermal gravimetric analysis, X-ray phase analysis, IR spectroscopy, and electron microscopy. The results of physicochemical studies of these decomposition products were compared to the published data for various uranium compounds, including UO2(NO3)2·6H2O. Apart from gaseous products, the final products of decomposition of 2–10 g of UO2(NO3)2·6H2O under the action of MWR for 35 min (the maximal process temperature, 170–320°C, is attained in the first 2–5 min of irradiation) are uranyl hydroxonitrate UO2(OH)NO3 and uranium trioxide UO3 or their hydrates. The results obtained are consistent with the mechanism suggested in our previous paper and involving the reactions (1) UO2(NO3)2·6H2O → UO2(OH)NO3 + 5H2O + HNO3 and (2) UO2(OH)NO3 → UO3 + HNO3. The physicochemical study confirms the conclusions on the composition of products of UO2(NO3)2·6H2O decomposition under the action of MWR, made previously on the basis of chemical studies. The only precursor of UO3 in microwave treatment of UO2(NO3)2·6H2O is UO2(OH)NO3 (or its hydrates). This is the main difference between the courses of uranyl nitrate decomposition under the conditions of microwave and convection heating. In the latter case, uranyl nitrate and its hydrates also participate in the formation of UO3.
Radiochemistry | 2015
S. A. Kulyukhin; E. P. Krasavina; I. A. Rumer
Sorption of 137Cs from aqueous solution onto layered double hydroxides (LDHs) of the composition LDH-M2+-M3+-Fe(CN)6 (M2+ = Mg, Cu, Ni, Zn; M3+ = Al, Fe) was studied. The LDH-Mg-M3+-Fe(CN)6 solid phases (M3+ = Al, Fe) take up 137Cs from 10−5 M aqueous CsNO3 solutions extremely weakly, whereas the LDH-M2+-M3+-Fe(CN)6 solid phases (M2+ = Cu, Ni, Zn; M3+ = Al, Fe) efficiently take up 137Cs. After 15-min contact of the solid and liquid phases, the apparent distribution coefficient Kd* of 137Cs ranges from ≈3 × 102 to ≈104 mL g−1 for M2+ = Cu, from ≈4 × 103 to ≈2 × 104 mL g−1 for M2+ = Ni, and from ≈5 × 103 to ≈3 × 104 mL g−1 for M2+ = Zn at V/m = 50 mL g−1. As the NaOH concentration in the solution is increased, the sorption performance of the examined LDHs, except LDH-Ni-Al-Fe(CN)6, drastically decreases, which is due to the formation of LDH-M2+-M3+-OH (M2+ = Ni, Zn; M3+ = Al, Fe) having low ability to take up 137Cs.
Radiochemistry | 2013
S. A. Kulyukhin; L. V. Mizina; N. A. Konovalova; I. A. Rumer; E. V. Zanina; D. S. Levushkin
Sorption of 131I2 from the water vapor-air medium on inorganic nanocomposite materials was studied. All the nanocomposite materials synthesized, containing 1, 2, 4, and 8 wt % Ag in various chemical forms, remove 131I2 from the water vapor-air flow with more than 99% efficiency.
Radiochemistry | 2012
S. A. Kulyukhin; L. V. Mizina; E. V. Zanina; I. A. Rumer; N. A. Konovalova; D. S. Levushkin
The paper deals with the synthesis and physicochemical properties of sorbents based on coarsely dispersed silica gel, containing 1, 2, 4, and 8 wt % nanoparticles of Ag compounds, intended for localization of volatile radioactive iodine compounds from the water vapor-air medium.
Radiochemistry | 2011
S. A. Kulyukhin; E. P. Krasavina; I. A. Rumer; L. V. Mizina; N. A. Konovalova; I. V. Gredina
Sorption of 90Sr and 90Y from aqueous solutions on Mg-Al and Mg-Nd layered double hydroxides (LDHs) in various forms was studied. The distribution coefficients Kd of U(VI) and 90Sr on LDH-Mg-Al-EDTA are 100–120 ml g−1 in 15 min of contact of the solid and liquid phases at V/m = 50 ml g−1. At the same time, under similar conditions, U(VI) and 90Sr are not sorbed from aqueous solutions on LDH-Mg-Al-C2O4. The sorption of U(VI) from aqueous solutions containing H2EDTA2−, C2O42−, and CO32− on LDH-Mg-Nd-CO3 and LDH-Mg-Al-CO3 strongly depends on the concentration of the complexing anions in the solution. In particular, for 10−3 M aqueous UO22+ solutions, with an increase in [C2O42−] from 10−3 to 5 × 10−2 M, Kd of U(VI) decreases from >5 × 103 to 70 ml g−1 for LDH-Mg-Al-CO3 and from 170 to ∼0 ml g−1 for LDH-Mg-Nd-CO3. In the presence of 10−3 to 5 × 10−2 M CO32− in aqueous solution, U(VI) is not noticeably sorbed on LDH-Mg-Nd-CO3 (Kd does not exceed 16 ml g−1 at V/m = 50 ml g−1), and on LDH-Mg-Al-CO3 the sorption sharply decreases (Kd decreases from >5 × 103 to ∼0 ml g−1 at V/m = 50 ml g−1). The presence of complexing anions in the solution does not appreciably affect the 90Sr sorption, but noticeably affects the 90Y sorption. With an increase in their concentration, Kd of 90Y appreciably decreases. The effect exerted by Sr2+ ions on the sorption of microamounts of U(VI) and by UO22+ ions on the sorption of microamounts of 90Sr and 90Y from aqueous solutions on LDH-Mg-Nd-CO3 was also examined.
Radiochemistry | 2009
S. A. Kulyukhin; E. P. Krasavina; I. V. Gredina; I. A. Rumer
Sorption of 137Cs, 90Sr, and 90Y radionuclides from aqueous solutions on the solid phase of layered double hydroxides (LDHs) of Mg, Al, and Nd was studied. Sorption of 137Cs from 10−5 M aqueous CsNO3 solutions on the LDH-Mg-Al-Nd solid phase is extremely weak. At the same time, 90Sr and 90Y are efficiently sorbed on the LDH-Mg-Al-Nd solid phase from 10−5 M aqueous Sr(NO3)2 solutions. After 5-min contact of the solid and liquid phases, Kd of 90Sr and 90Y exceeds 103 ml g−1. With an increase in the Nd content in LDHs of mixed composition, their sorption properties toward 90Sr and 90Y are enhanced.
Radiochemistry | 2006
S. A. Kulyukhin; N. B. Mikheev; A. N. Kamenskaya; N. A. Konovalova; I. A. Rumer
Data on the properties of U in lower oxidation states, published between 1988 to 2005, are summarized. In this period, the interest in the chemistry of trivalent and bivalent uranium, especially in its coordination and organometallic chemistry, considerably increased. Possible applications of trivalent uranium are outlined.