| 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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Claret, Francis
Bureau de Recherches Géologiques et Minières
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Water dynamics in calcium silicate hydrates probed by inelastic neutron scattering and molecular dynamics simulationscitations
- 2023How much water is there within calcium silicate hydrates? Probing water dynamics by Inelastic Neutron Scattering and Molecular Dynamics Simulations
- 2022Modelling of the long-term evolution and performance of engineered barrier systemcitations
- 2022MODELLING OF THE LONG TERM EVOLUTION AND PERFORMANCE OF ENGINEERED BARRIER SYSTEM
- 2020Contribution of the results of the CEBAMA project to decrease uncertainties in the Safety Case and Performance Assessment of radioactive waste repositoriescitations
- 2017Evidence of (Ca, Mg) smectite formation at Clay/cement interfaces
- 2017In situ interactions between Opalinus Clay and Low Alkali Concretecitations
- 2017In-situ determination of the kinetics and mechanisms of nickel adsorption by nanocrystalline vernaditecitations
- 2017Modelling of the COx/glass interactions: case of the long term MVE experiment
- 2017Minerals paragenesis in hydrated cement paste seen by diffraction tomography
- 2015Structural defects in layered structures: Their determination and their impact on reactivity
- 2014Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basincitations
- 2014Constraints from sulfur isotopes on the origin of gypsum at concrete/claystone interfacescitations
- 2013X-ray diffraction: a powerful tool to probe and understand the structure of nanocrystalline calcium silicate hydratescitations
- 2013On the nature of structural disorder in calcium silicate hydrates with a calcium/silicon ratio similar to tobermoritecitations
- 2012Heterogeneous formation of ferric oxide nanoparticles on chlorite surfaces studied by x-ray absorption spectromicroscopy (STXM)citations
Places of action
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article
In-situ determination of the kinetics and mechanisms of nickel adsorption by nanocrystalline vernadite
Abstract
International audience ; In-situ kinetics and mechanisms of Ni2+ uptake by synthetic vernadite were determined at pH 5.8 and I = 0.1 M NaCl using wet chemistry, atomic-resolution scanning transmission electron microscopy coupled with electron energy loss spectroscopy (STEM-EELS) and synchrotron high-energy X-ray scattering (HEXS) in both the Bragg-rod and pair distribution function formalisms. The structural formula of the initial solids was (Mn0.053+Na0.23+)-Mn-Tc(H2O)(0.69)H+ (0.06) [(Mn4+ (0.86)Mn(0.04)(3+)vac(0.1))O-2), where species under brackets form the layer having "vac" layer vacancies, and where other species are present in the interlayer, with TC standing for "triple corner sharing" configuration. According to HEXS and STEM-EELS, adsorbed Ni2+ adopted mainly a TC configuration, and had a Debye-Waller factor about four times higher than layer Mn. Steady-state was reached after similar to 2.2 h of contact time, and the final structural formula of the solid was (Ni0.122+Mn3+)-Ni-Tc-Mn-Tc Na-0.05(+) 0.12H2O0.36H0.01+(Mn(0.87)(4+)vac(0.13))O-2]. Atomic-scale imaging of the solids also evinced the presence of minor Ni adsorbed at the crystal edge. The retention coefficient R-D = 10(3.76 +/-) (0.06) L kg(-1), computed from PDF data modelling and solution chemistry results, was in agreement with those available in the literature.