Radioactive Waste Management

Baisden, P. A.; Atkins-Duffin, Cindy

doi:10.1007/978-1-4419-0720-2_61

Cited by 5 publications

(2 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Uranium(VI) is the main (by mass) component of spent nuclear fuel (SNF). The PUREX process with its further modifi cations is commonly used for the recovery of uranium (and plutonium) [1]. Two decades ago a novel concept partitioning and transmutation (P&T) appeared for the technology of nuclear waste reprocessing.…”

Section: Introductionmentioning

confidence: 99%

“…Two decades ago a novel concept partitioning and transmutation (P&T) appeared for the technology of nuclear waste reprocessing. Separation of long--lived minor actinides (MA), in particular americium, from the waste, followed by its transmutation by fast neutrons to short-lived and stable nuclides would result in a signifi cant shortening of the period of signifi cant radiotoxicity of the waste [1,2]. In the last years, a new process, GANEX (grouped actinide separation), was developed by CEA [3], and then modifi ed using different extractants and stripping agents [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO₃-Ph-BTP ligand, using liquid-liquid extraction

et al. 2015

View full text Add to dashboard Cite

Complex formation between uranyl ion, UO22+, and a hydrophilic anionic form of SO3-Ph-BTP4- ligand, L4-, in water was studied by liquid-liquid extraction experiments performed over a range of the ligand and HNO3 concentrations in the aqueous phase, at a constant concentration of nitrate anions at 25°C . The competition for UO22+ ions between the lipophilic TODGA extractant and the hydrophilic L4- ligand leads to the decrease in the uranyl distribution ratios, D, with an increasing L4- concentration. The model of the solvent extraction process used accounts - apart from uranyl complexation by TODGA and SO3-Ph-BTP4- - also for uranyl complexation by nitrates and for the decrease in the concentration of the free L4- ligand in the aqueous phase, due to its protonation, bonding in the uranyl complex and the distribution between the two liquid phases. The unusually strong dependence of the D values on the acidity, found in the experiment, could hardly be explained as due to L4- protonation merely. Three hypotheses were experimentally tested, striving to interpret the data in terms of additional extraction to the organic phase of ion associates of protonated TODGA cation with either partly protonated anionic L4- ligands or anionic UO22+ complexes with NO3 - or L4-. None of them has been confirmed. The analysis of the results, based on the formal correction of free ligand concentrations, points to the formation of 1 : 1 and 1 : 2 uranyl - SO3-Ph-BTP complexes in the aqueous phase. The conditional formation constant of the 1:1 complex has been determined, logßL,1 = 2.95 ± 0.15.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO₃-Ph-BTP ligand, using liquid-liquid extraction

et al. 2015

View full text Add to dashboard Cite

show abstract

Impacts of Radioactive Waste and Sustainable Approaches on Its Remediation

Kavinaya Shri,

Kanimozhi,

Sreeram

et al. 2024

Environmental Science and Engineering

View full text Add to dashboard Cite

One-dimensional yttrium silicide electride (Y5Si3:e−) for encapsulation of volatile fission products

Kuganathan

Chroneos

Grimes

2021

Journal of Applied Physics

View full text Add to dashboard Cite

Better ways are needed to capture radioactive volatile fission products (Kr, Xe, Br, I, Te, Rb, and Cs) discharged during the reprocessing of spent nuclear fuel in order to reduce the volumes of produced waste and minimize environmental impact. Using density functional theory, we examine the efficacy of a one-dimensional yttrium silicide electride (Y5Si3:e−) as a host matrix to encapsulate these species. Endoergic encapsulation energies calculated for Kr, Xe, Rb, and Cs imply they are not captured by Y5Si3:e−. Encapsulation is exoergic for Br, I, and Te with respect to their atoms and dimers as reference states, meaning that they can be captured effectively due to their high electronegativities. This is further supported by the formation of anions due to charge transfer between Y5Si3:e− and Br (I and Te). The selectivity of this material for these volatile species makes it promising for use in nuclear filters.

show abstract

Radioactive Waste Management

Cited by 5 publications

References 27 publications

Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO₃-Ph-BTP ligand, using liquid-liquid extraction

Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO₃-Ph-BTP ligand, using liquid-liquid extraction

Impacts of Radioactive Waste and Sustainable Approaches on Its Remediation

One-dimensional yttrium silicide electride (Y5Si3:e−) for encapsulation of volatile fission products

Contact Info

Product

Resources

About

Radioactive Waste Management

Cited by 5 publications

References 27 publications

Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO3-Ph-BTP ligand, using liquid-liquid extraction

Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO3-Ph-BTP ligand, using liquid-liquid extraction

Impacts of Radioactive Waste and Sustainable Approaches on Its Remediation

One-dimensional yttrium silicide electride (Y5Si3:e−) for encapsulation of volatile fission products

Contact Info

Product

Resources

About

Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO₃-Ph-BTP ligand, using liquid-liquid extraction

Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO₃-Ph-BTP ligand, using liquid-liquid extraction