| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Cardinaels, Thomas
Flemish Institute for Technological Research
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (75/75 displayed)
- 2024Demonstration of Uranium(VI)/Plutonium(IV) Separation via Solvent Extraction by D2EHiBA in Annular Centrifugal Contactors
- 2024Study on the sorption and desorption behavior of La3+ and Bi3+ by bis(2-ethylhexyl)phosphate modified activated carbon
- 2024Demonstration of U(VI)/Pu(IV) separation by solvent extraction in modified lab-scale annular centrifugal contactors using D2EHiBA extractant
- 2024Kinetics of electrochemical Eu3+ to Eu2+ reduction in aqueous mediacitations
- 2024Improving americium/curium separation factors in the AmSel process through symmetry lowering of the diglycolamide extractantcitations
- 2024Extraction and speciation studies of new diglycolamides with varying alkyl chains for selective americium partitioning
- 2024A Preliminary Study of Spherical Surface-Modified Carbon Materials for Potential Application in La3+ (Ac3+) and Bi3+ Separation
- 2024Separation of terbium as a first step towards high purity terbium-161 for medical applicationscitations
- 2024<SUP>225</SUP>Ac/<SUP>213</SUP>Bi radionuclide generators for the separation of <SUP>213</SUP>Bi towards clinical demandscitations
- 2023Sorption and desorption performance of La3+/Bi3+ by surface-modified activated carbon for potential application in medical 225Ac/213Bi generatorscitations
- 2023Solvent Optimization Studies for a New EURO-GANEX Process with 2,2'-Oxybis(<i>N,N</i>-di-<i>n</i>-decylpropanamide) (mTDDGA) and Its Radiolysis Productscitations
- 2023Gamma radiation effects on AG MP-50 cation exchange resin and sulfonated activated carbon for bismuth-213 separationcitations
- 2023A new unsymmetrical diglycolamide for selective americium partitioning
- 2023Design of a Modular Annular Centrifugal Contactor for Lab-Scale Counter-Current Multistage Solvent Extractioncitations
- 2023Radionuclide generation
- 2023Separation of americium from highly active raffinates by an innovative variant of the AmSel process based on the ionic liquid Aliquat-336 nitrate
- 2023First-principles study of the radiolytic degradation of diglycolamidescitations
- 2023Selective separation of Bi3+ from La3+/Ac3+ by sorption on sulfonated carbon materials for use in an inverse 225Ac/213Bi radionuclide generator: Batch and column testscitations
- 2022Design of a flexible annular centrifugal contactor for experimental counter-current multi-stage solvent extraction
- 2022Electrochemical oxidation of terbium(III) in aqueous media towards purification of medical Tb-161
- 2022Hydrolysis of Uranyl‐, Nd‐, Ce‐Ions and their Mixtures by Thermal Decomposition of Ureacitations
- 2022Selective americium partitioning using an ionic liquid variant of the AmSel solvent
- 2022Gamma radiolytic stability of the novel modified diglycolamide 2,2′-oxybis(<i>N</i>,<i>N</i>-didecylpropanamide) (mTDDGA) for grouped actinide extractioncitations
- 2022Electrochemical oxidation of terbium(III) in aqueous media: influence of supporting electrolyte on oxidation potential and stabilitycitations
- 2021Dosimetry and methodology of gamma irradiation for degradation studies on solvent extraction systemscitations
- 2021Hydrolysis of uranium(VI), neodymium(III) and cerium(III/IV) by thermal decomposition of urea
- 2021Selective extraction of trivalent actinides using CyMe4BTPhen in the ionic liquid Aliquat-336 nitratecitations
- 2020The conversion of ammonium uranate prepared via sol-gel synthesis into uranium oxidescitations
- 2020Selective Extraction of Americium from Curium and the Lanthanides by the Lipophilic Ligand CyMe4BTPhen Dissolved in Aliquat-336 Nitrate Ionic Liquidcitations
- 2020Solvent Extraction Studies for the Separation of Trivalent Actinides from Lanthanides with a Triazole-functionalized 1,10-phenanthroline Extractantcitations
- 2020Fabrication of Nd- and Ce-doped uranium dioxide microspheres via internal gelationcitations
- 2020Gamma Radiolysis of TODGA and CyMe4BTPhen in the Ionic Liquid Tri-n-Octylmethylammonium Nitratecitations
- 2020Structural changes of Nd- and Ce-doped ammonium diuranate microspheres during the conversion to U<sub>1-y</sub> Ln yO<sub>2±x</sub>citations
- 2020Supported ionic liquid phases for the separation of samarium and europium in nitrate media: Towards purification of medical samarium-153citations
- 2019Radiochemical processing of nuclear-reactor-produced radiolanthanides for medical applicationscitations
- 2019Supported ionic liquid phases for the purification of medical samarium-153
- 2019Removal of europium impurities from samarium-153 in nitrate media using ionic liquids
- 2019Stability of europium(ii) in aqueous nitrate solutionscitations
- 2019Electrochemical Oxidation of Terbium – the future of high purity Tb-161 for medical applications
- 2019Studies on the Thoria Fuel Recycling Loop Using Triflic Acid: Effects of Powder Characteristics, Solution Acidity, and Radium Behaviorcitations
- 2018Separation of samarium and europium by solvent extraction with an undiluted ionic liquid: towards high purity medical samarium‐153
- 2018Solvent Extraction of Am(III), Cm(III), and Ln(III) Ions from Simulated Highly Active Raffinate Solutions by TODGA Diluted in Aliquat-336 Nitrate Ionic Liquidcitations
- 2018Thermal decomposition and structural changes of lanthanide-doped uranium dioxide particles prepared by internal gelation
- 2018Low-Temperature Oxidation of Fine UO2 Powders: Thermochemistry and Kineticscitations
- 2018Separation of samarium and europium by solvent extraction with an undiluted quaternary ammonium ionic liquid: towards high-purity medical samarium-153citations
- 2017The effect of precipitation and calcination parameters on oxalate derived ThO2 pelletscitations
- 2017Sintering of thorium oxide comprising materials
- 2017Conditioning of ionic liquid waste streams in nuclear research applications
- 2017Extraction of Am(III) from simulated Highly Active Raffinate solution by soft-donor ligands dissolved in ionic liquid / molecular diluent mixtures
- 2017Characterization of UyNd1-yO2+x and UyCe1-yO2+x spheres produced by internal gelation
- 2017Use of Triflic Acid in the Recycling of Thoria from Nuclear Fuel Production Scrapcitations
- 2016Activated sintering of ThO2 with Al2O3 under reducing and oxidizing conditionscitations
- 2016Low-Temperature Oxidation of Fine UO2 Powders: A Process of Nanosized Domain Developmentcitations
- 2016Application of Aliquat-336 nitrate ionic liquid based extractants for minor actinide separation
- 2016Purification of medical 153Sm using radiation-resistant ionic liquids
- 2015Production and verification of stoichiometric uranium dioxide
- 2015Low temperature oxidation of uranium dioxide: an X-ray and electron diffraction study
- 2014Solid state synthesis of UO2 and ThO2 doped with Gd2O3
- 2014The influence of particle characteristics on the passivation of UO2 powder
- 2011Design strategies for ionic liquid crystals
- 20101,10-Phenanthrolinium ionic liquid crystals
- 2009Pyrrolidinium Ionic Liquid Crystalscitations
- 2007Imidazolium and Pyrrolidinium Ionic Metallomesogens with Pendant Mesogenic Groups
- 2007Lanthanidomesogens derived of cyclohexyl-substituted beta-diketonate complexes
- 20071,10-Phenanthroline-based lyotropic liquid crystals
- 2007Liquid-crystalline complexes of 1,10-phenanthroline
- 2006Liquid-crystalline complexes of transition metals and rare earths with substituted 1,10-phenanthroline ligands.
- 2005Luminescent organometallic liquid crystals based on complexes of bromotricarbonyl rhenium(I)
- 2005Phenanthrolines as versatile ligands for the design of liquid-crystalline metal complexes
- 2005Nematic liquid-crystalline lanthanide complexes
- 2005Design of high coordination number metallomesogens by decoupling of complex-forming and mesogenic groups
- 2004Decoupling of coordinating units and mesophase-inducing groups in metallomesogens
- 2004Liquid-crystalline lanthanide complexes
- 2003Liquid-crystalline metallophthalocyanines containing late first-row transition metalscitations
- 2003Mesophase behaviour and thermal stability of octa-alkoxy substituted phthalocyaninatocobalt(II) complexescitations
Places of action
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document
Hydrolysis of uranium(VI), neodymium(III) and cerium(III/IV) by thermal decomposition of urea
Abstract
The slides were presented at the Uranium Science Conference on July 1, 2021 (T21). <strong>Abstract</strong> Uranium dioxide is used as conventional fuel for the production of energy by nuclear fission. Even though the front-end of the nuclear fuel cycle is well known, studies to investigate alternative fabrication routes to prepare precursors for oxidic uranium-based fuels are ongoing. The precipitation induced by thermal decomposition of urea has been demonstrated for several metals (e.g. Ti, Ni, Cu, Zn, Ce, Th), and a modified hydrothermal approach has been applied to precipitate ammonium diuranate (ADU) from a solution containing uranyl ions. Within this study, we investigated the hydrolysis behaviour of uranyl and lanthanide mixtures to support the development of alternative fabrication routes for transmutation fuel, such as sol-gel processes. The lanthanides Nd and Ce acted as surrogates for the actinides Am and Pu, respectively. We specifically sought out parameters for the hydrolysis of uranyl ions induced by thermal decomposition of urea at ambient pressure. Moreover, the hydrolysis behaviour of Nd(III), Ce(III) and Ce(IV), as well as mixtures of the lanthanide- and uranyl ions, was investigated using the conditions determined for uranyl. Hydrolysis experiments were carried out at 90 °C and 100 °C for n(urea) : n(UO2(2+)) ratios of 26 and 52. The solution was sampled during the precipitation reaction to monitor its pH and certain samples were analysed applying UV/VIS spectroscopy and inductively coupled plasma mass spectrometry, while powder X-ray diffraction and scanning electron microscopy were applied to characterise the precipitates. Uranyl ions hydrolysed between pH 5.1 and pH 5.5 and the experimental conditions impacted the reaction kinetics significantly. A temperature increase from 90 °C to 100 °C reduced the time to finish the precipitation by about 75 %, whereas a doubling of the urea content decreased the reaction time by about 50 %. ADU precipitates of different composition (x UO3 · y NH3 · z H2O) formed under the applied conditions. For trivalent Nd and Ce, a comparable pH evolution and lanthanide carbonate hydroxide (LnCO3OH) products were observed, whereas tetravalent Ce hydrolysed at a lower pH forming CeO2. The precipitation behaviour was confirmed for solutions containing binary mixtures of uranyl and lanthanide cations, while a simultaneous precipitation of Nd(III) and Ce(III) was observed for ternary U/Nd/Ce compositions. For the latter, a partial incorporation of the Ln phase into the ADU phase was observed, whereas the precipitation in the presence of Ce(IV)/CeO2 led to the formation of three separate phases.