| 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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Dardenne, Kathy
Karlsruhe Institute of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024High Resolution X-ray Spectroscopy of Actinides at the KIT Light Source
- 2023Investigation of the solid/liquid phase transitions in the U–Pu–O systemcitations
- 2023Stainless steel corrosion under anoxic, highly saline and elevated temperature conditions
- 2021Anaerobic corrosion of carbon steel in compacted bentonite exposed to natural opalinus clay porewater: bentonite alternation study
- 2021Two-dimensional Wide-Angle X-ray Scattering on a Cm-doped borosilicate glass in a beryllium containercitations
- 2021Anaerobic corrosion of carbon steel in compacted bentonite exposed to natural Opalinus clay porewater: Bentonite alteration studycitations
- 2019Melting behaviour of uranium-americium mixed oxides under different atmospherescitations
- 2015Comparative U, Np and Pu M edge high energy resolution X-ray absorption spectroscopy (HR-XANES) investigations of model and genuine active waste glass
- 2014Nanostructured gadolinium-doped ceria microsphere synthesis from ion exchange resin: Multi-scale in-situ studies of solid solution formationcitations
- 2007Structural characterization of Nd-doped calcium aluminosilicate glasses designed for the preparation of zirconolite (CaZrTi2O7) -based glass-ceramic
- 2005XAFS investigation of the formation and structure of Zr(IV) colloids
- 2004Sorption of Am(III) onto 6-line-ferrihydrite and its alteration products: investigations by EXAFS
Places of action
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document
Sorption of Am(III) onto 6-line-ferrihydrite and its alteration products: investigations by EXAFS
Abstract
220, F-38043, Grenoble, France For the long-term performance assessment of nuclear waste repositories, knowledge concerning the interactions of actinide ions with mineral surfaces is imperative. The mobility of released radionuclides is strongly dependent on the sorption/desorption processes at mineral surfaces and their incorporation into the mineral frame. Ferrihydrite is able to dominate the retardation of radionuclides in particular the actinides in the near-field as well as in the far-field of a nuclear waste repository. Upon heating pure ferrihydrite converts to crystalline goethite and hematite. In the presence of di- or trivalent metal ions the transformation is affected leading to the promotion of one crystal formation over the other and incorporation of these ions. This study deals with the question if released Am(III) can be immobilized by sorption onto 6-line-ferrihydrite. Moreover it is studied what happens if ferrihydrite transforms to a more crystalline phase. Therefore the sorption of Am(III) onto ferrihydrite at different pH values and its reaction with the mineral surface after its transformation were investigated by EXAFS. EXAFS measurements show the sorption of Am(III) by bidentate bonding onto 6-line-ferrihydrite at pH 5.5 (Am-Fe 3.7 Å; Am-O 2.48 Å ) and pH 8 (Am-Fe 3.69 Å; Am-O 2.48 Å ). The alteration of 6-line-ferrihydrite leads to the formation of goethite and hematite at both pH values. While Am(III) is released during the transformation at pH 5.5 it is incorporated in the goethite like structure at pH 8 (Am-Fe 3.59; Am-Fe 3.32 Å; Am-O 2.46 Å ).