Structural identification of europium(iii) adsorption complexes on montmorillonite

Kowal-Fouchard, Armelle; Drot, R.; Simoni, E.; Marmier, Nicolas; Fromage, F.; Ehrhardt, J.J.

doi:10.1039/b400306c

Cited by 67 publications

(45 citation statements)

References 41 publications

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“…2b). The Eu 3d 5/2 peak is found at 1125 eV (Table 1), in agreement with the value for Eu (III) sorbed species [4,33,34]. Furthermore, one should notice that sorption experiments make the impurities to vanish, which indicates that these impurities were certainly present at the surface of dickite particles and not incorporated in the bulk.…”

Section: Resultssupporting

confidence: 72%

“…Taking into account the atomic concentration of O, Al and Si atoms, results for pristine dickite sample lead to the following relative concentrations: O (70%), Al (12%) and Si (18%). The atomic formula of dickite is Al 2-Si 2 O 5 (OH) 4 , which gives O (69.24%), Al ¼ Si (15.38%). The slight difference between the measured values and the expected stoichiometric composition might come from either a low amount of impurities at the surface of dickite particles or a surface Si enrichment associated with SiO 4 terminal sheets of the particles.…”

Section: Resultsmentioning

confidence: 99%

“…However, the solid phase also provides interesting information on sorption sites, surface complexes and precipitation states. Spectroscopic methods are well adapted to question the solid phase with a minimum of perturbation [4]. However, due to their low sensitivity, they often require high surface concentration of cations to be deposited on solid particles, which compels to make sorption experiments with rather high cation concentrations in solution (10 À3 or 10 À2 mol L À1 typically).…”

Section: Introductionmentioning

confidence: 99%

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Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies

Cremel¹,

Zamama²,

Dossot³

et al. 2007

Comptes Rendus. Chimie

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies

Cremel¹,

Zamama²,

Dossot³

et al. 2007

Comptes Rendus. Chimie

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“…those cations were found to be localized at the middle of the clay interlayer, fully hydrated, indicating outer-sphere complexation [3,7,8].…”

Section: +mentioning

confidence: 99%

Hydration of Na⁺, Ni²⁺, and Sm³⁺in the Interlayer of Hectorite: A Quasielastic Neutron Scattering Study

et al. 2009

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Quasielastic neutron scattering experiments were performed with Na-hectorite, Ni-hectorite, and Sm-hectorite samples in order to find out whether Sm 3+ is present in the clay interlayer as a fully hydrated cation (outer-sphere complex), or, as it follows from neutron diffraction data analysis, it is dehydrated and bound to the clay surface (inner-sphere complex). The results obtained for the Sm-hectorite were compared with other interlayer cations: strongly hydrated Ni 2+ and relatively weakly hydrated Na+. It was found that water mobility in the Sm-hectorite sample is very close to the water mobility in Ni-hectorite. This is only possible if the Sm 3+ ion is fully hydrated. It was shown that water molecules hydrating Ni 2+ and Sm 3+ exhibit diffusion 2 mobility measurable with backscattering spectrometers. The diffusion coefficients of the exchangeable cations were found using the slow exchange approximations D Ni = (0.05 -0.14)x 10 -9 m 2 /s and D Sm = (0.04 -0.18) x 10 -9 m 2 /s.

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“…Thus, it can even be applied at high temperature, since previous spectroscopic data are only available at room temperature: e.g. Stumpf et al, 2001; for Cm(III) onto kaolinite and montmorillonite; Chisholm-Brause et al, 2004 andKowal-Fouchard et al, 2004; for Eu(III) and uranyl onto montmorillonite.…”

Section: Introductionmentioning

confidence: 98%

Europium retention onto clay minerals from 25 to 150°C: Experimental measurements, spectroscopic features and sorption modelling

Tertre

Berger

Simoni

et al. 2006

Geochimica et Cosmochimica Acta

182

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The sorption of Eu(III) onto kaolinite and montmorillonite was investigated up to 150°C. The clays were purified samples, saturated with Na in the case of montmorillonite. Batch experiments were conducted at 25, 40, 80 and 150°C in 0.5 M NaClO 4 solutions to measure the distribution coefficients (Kd) of Eu as a trace element (<10 À6 mol/L) between the solution and kaolinite. For the Na-montmorillonite, we used Kd results from a previous study [Tertre, E., Berger, G., Castet, S., Loubet, M., Giffaut, E., 2005. Experimental study of adsorption of Ni 2+ , Cs + and Ln 3+ onto Na-montmorillonite up to 150°C. Geochim. Cosmochim. Acta 69, 4937-4948] obtained under exactly the same conditions. The number and nature of the Eu species sorbed onto both clay minerals were investigated by time resolved laser fluorescence spectroscopy (TRLFS) in specific experiments in the same temperature range. We identified a unique inner-sphere complex linked to the aluminol sites in both clays, assumed to be @AlOEu 2+ at the edge of the particles, and a second exchangeable outersphere complex for montmorillonite, probably in an interlayer position. The Kd values were used to adjust the parameters of a surface complexation model (DLM: diffuse layer model) from 25 to 150°C. The number of Eu complexes and the stoichiometry of reactions were constrained by TRLFS. The acidity constants of the amphoteric aluminol sites were taken from another study [Tertre, E., Castet, S., Berger, G., Loubet, M., Giffaut, E. Acid/base surface chemistry of kaolinite and Na-montmorillonite at 25 and 60°C: experimental study and modelling. Geochim. Cosmochim. Acta, in press], which integrates the influence of the negative structural charge of clays on the acid/base properties of edge sites as a function of temperature and ionic strength. The results of the modelling show that the observed shift of the sorption edge towards low pH with increasing temperature results solely from the contribution of the @AlOEu 2+ edge complexes. Finally, we successfully tested the performance of our model by confronting the predictions with experimental Kd data. We used our own data obtained at lower ionic strength (previous study) or higher suspension density and higher starting concentration (TRLFS runs, this study), as well as published data from other experimental studies [Bradbury, M.H., Baeyens, B., 2002. Sorption of Eu on Na and Ca-montmorillonite: experimental investigations and modeling with cation exchange and surface complexation. Geochim. Cosmochim. Acta 66, 2325-2334; Kowal-Fouchard, A., 2002. Etude des mécanismes de rétention des ions U(IV) et Eu(III) sur les argiles: influence des silicates. Ph.D. Thesis, Université Paris Sud, France, 330p].

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Structural identification of europium(iii) adsorption complexes on montmorillonite

Cited by 67 publications

References 41 publications

Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies

Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies

Hydration of Na⁺, Ni²⁺, and Sm³⁺in the Interlayer of Hectorite: A Quasielastic Neutron Scattering Study

Europium retention onto clay minerals from 25 to 150°C: Experimental measurements, spectroscopic features and sorption modelling

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Structural identification of europium(iii) adsorption complexes on montmorillonite

Cited by 67 publications

References 41 publications

Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies

Sorption of Eu3+ on dickite particles studied by Raman, luminescence, and X-ray photoelectron spectroscopies

Hydration of Na+, Ni2+, and Sm3+in the Interlayer of Hectorite: A Quasielastic Neutron Scattering Study

Europium retention onto clay minerals from 25 to 150°C: Experimental measurements, spectroscopic features and sorption modelling

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Hydration of Na⁺, Ni²⁺, and Sm³⁺in the Interlayer of Hectorite: A Quasielastic Neutron Scattering Study