Author(s): Rao, Linfeng; Garnov, Alexander Yu.; Rai, Dhanpat; Moore, Robert C. | Abstract: Isosac... more Author(s): Rao, Linfeng; Garnov, Alexander Yu.; Rai, Dhanpat; Moore, Robert C. | Abstract: Isosaccharinic acid (ISA), a degradation product of cellulous materials, has been a subject of study due to its presence in cellulose co-disposed low-level nuclear wastes and its ability to complex actinides. Because ISA itself is biodegradable, it has been proposedto incorporate ISA into foams for the purpose of cleaning contaminated surface, replacing complexants that are harsh to the natural environment. In this work, the complexation of isosaccharinic acid with Th(IV), U(VI) and Np(V) has been studied at 25 oC. Formation constants of the complexes and the enthalpy of complexation were determined by potentiometry and calorimetry, respectively. To help evaluate the effectiveness of ISA for decontamination in the presence of common competing ions, the complexation of ISA with Fe(III) and Ca(II) was also investigated.
Decomposition of ethylenediaminetetraacetate in alkaline solutions with H2O2, Na2S2O8, NaClO, and... more Decomposition of ethylenediaminetetraacetate in alkaline solutions with H2O2, Na2S2O8, NaClO, and NaBrO was studied titrimetrically. EDTA is oxidized in solutions heated above 60°C in the presence of cobalt salts at stepwise addition of excess H2O2. The reaction between persulfate and EDTA has an induction period decreasing with increasing NaOH concentration and temperature and with decreasing initial EDTA content or with
The complexation of uranium(VI) and samarium(III) with oxydiacetate in 1.05 mol kgâ»Â¹ NaClOâ is... more The complexation of uranium(VI) and samarium(III) with oxydiacetate in 1.05 mol kgâ»Â¹ NaClOâ is studied at variable temperatures (25-70 C). Three U(VI)/O DA complexes (UOâL, UOâLâ²â», and UOâHLââ») and three Sm(III)/ODA complexes (SmL{sub j}{sup (3-2j)+} with j = 1, 2, 3) are identified in this temperature range. The formation constants and the molar enthalpies of complexation are determined by potentiometry
SummaryProtonation and complexation of α-isosaccharinic acid with U(VI) and Fe(III) have been stu... more SummaryProtonation and complexation of α-isosaccharinic acid with U(VI) and Fe(III) have been studied in acidic solutions at
Journal of Radioanalytical and Nuclear Chemistry, 2009
The specific energy density from radioactive decay is five to six orders of magnitude greater tha... more The specific energy density from radioactive decay is five to six orders of magnitude greater than the specific energy density in conventional chemical battery and fuel cell technologies. We are currently investigating the use of liquid semiconductor based betavoltaics as a way to directly convert the energy of radioactive decay into electrical power and potentially avoid the radiation damage that
Journal of Radioanalytical and Nuclear Chemistry Articles, 1995
ABSTRACT A kinetic isotope effect in Pu(V) disproportionation has been observed in nitric acid so... more ABSTRACT A kinetic isotope effect in Pu(V) disproportionation has been observed in nitric acid solution under the effect of power ultrasound with intensity 0.9W·cm–2 and frequency 22 kHz. The isotope separation coefficient for242Pu/239Pu isotopes was found to be 1.0081 at 20°C. Without sonication the k.i.e. was not observed. The rate constant of Pu(V) disproportionation was found to be accelerated under sonication. The rate constant determined was (5.7±0.6)·10–3 12·mol–2·s–1 atl=0.9 W·cm–2,v=22 kHz, [HNO3]=0.5 mol·l–1 andT=20°C. It is supposed that the acceleration of Pu(V) disproportionation and the kinetic isotope effect are due to the activation of plutonoyl groups in the interface between the cavitation bubble and the bulk solvent.
Author(s): Rao, Linfeng; Garnov, Alexander Yu.; Rai, Dhanpat; Moore, Robert C. | Abstract: Isosac... more Author(s): Rao, Linfeng; Garnov, Alexander Yu.; Rai, Dhanpat; Moore, Robert C. | Abstract: Isosaccharinic acid (ISA), a degradation product of cellulous materials, has been a subject of study due to its presence in cellulose co-disposed low-level nuclear wastes and its ability to complex actinides. Because ISA itself is biodegradable, it has been proposedto incorporate ISA into foams for the purpose of cleaning contaminated surface, replacing complexants that are harsh to the natural environment. In this work, the complexation of isosaccharinic acid with Th(IV), U(VI) and Np(V) has been studied at 25 oC. Formation constants of the complexes and the enthalpy of complexation were determined by potentiometry and calorimetry, respectively. To help evaluate the effectiveness of ISA for decontamination in the presence of common competing ions, the complexation of ISA with Fe(III) and Ca(II) was also investigated.
Decomposition of ethylenediaminetetraacetate in alkaline solutions with H2O2, Na2S2O8, NaClO, and... more Decomposition of ethylenediaminetetraacetate in alkaline solutions with H2O2, Na2S2O8, NaClO, and NaBrO was studied titrimetrically. EDTA is oxidized in solutions heated above 60°C in the presence of cobalt salts at stepwise addition of excess H2O2. The reaction between persulfate and EDTA has an induction period decreasing with increasing NaOH concentration and temperature and with decreasing initial EDTA content or with
The complexation of uranium(VI) and samarium(III) with oxydiacetate in 1.05 mol kgâ»Â¹ NaClOâ is... more The complexation of uranium(VI) and samarium(III) with oxydiacetate in 1.05 mol kgâ»Â¹ NaClOâ is studied at variable temperatures (25-70 C). Three U(VI)/O DA complexes (UOâL, UOâLâ²â», and UOâHLââ») and three Sm(III)/ODA complexes (SmL{sub j}{sup (3-2j)+} with j = 1, 2, 3) are identified in this temperature range. The formation constants and the molar enthalpies of complexation are determined by potentiometry
SummaryProtonation and complexation of α-isosaccharinic acid with U(VI) and Fe(III) have been stu... more SummaryProtonation and complexation of α-isosaccharinic acid with U(VI) and Fe(III) have been studied in acidic solutions at
Journal of Radioanalytical and Nuclear Chemistry, 2009
The specific energy density from radioactive decay is five to six orders of magnitude greater tha... more The specific energy density from radioactive decay is five to six orders of magnitude greater than the specific energy density in conventional chemical battery and fuel cell technologies. We are currently investigating the use of liquid semiconductor based betavoltaics as a way to directly convert the energy of radioactive decay into electrical power and potentially avoid the radiation damage that
Journal of Radioanalytical and Nuclear Chemistry Articles, 1995
ABSTRACT A kinetic isotope effect in Pu(V) disproportionation has been observed in nitric acid so... more ABSTRACT A kinetic isotope effect in Pu(V) disproportionation has been observed in nitric acid solution under the effect of power ultrasound with intensity 0.9W·cm–2 and frequency 22 kHz. The isotope separation coefficient for242Pu/239Pu isotopes was found to be 1.0081 at 20°C. Without sonication the k.i.e. was not observed. The rate constant of Pu(V) disproportionation was found to be accelerated under sonication. The rate constant determined was (5.7±0.6)·10–3 12·mol–2·s–1 atl=0.9 W·cm–2,v=22 kHz, [HNO3]=0.5 mol·l–1 andT=20°C. It is supposed that the acceleration of Pu(V) disproportionation and the kinetic isotope effect are due to the activation of plutonoyl groups in the interface between the cavitation bubble and the bulk solvent.
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