Contribution à l'étude des interactions ions-surfaces : application aux systèmes Se(IV), Se(VI), U(VI) sur TiO2 rutile et Eu(III) sur dickite

Abstract : Oxo-anions such as selenite/selenate (SeO32-/ SeO42-) and oxo-cationss such as uranyl (UO22+) are contaminants found in ultimate nuclear wastes (79Se) which could be stored in deep geological media. Furthermore, selenium mobile species can be found in high amount in some polluted soils. Adsorptions of selenite and selenate were studied on a model oxide surface, namely rutile TiO2. The final goal was to find out possible differences in reactivity among crystallographic faces and try to extrapolate the results to the powder behaviour. The goal of these studies was to use spectroscopic characterizations and batch experiments in order to propose surface complexes. As our interest is focused on the chemistry of the water/oxide interface, surface specific methods are thus required. Techniques used in this work are Angle Resolved X-Ray Photoelectron Spectroscopy, Near-Field Raman Spectroscopy (NFRS), Surface Second Harmonic Generation (SSHG), and Atomic Force Microscopy (AFM). Batch experiments were performed on powders, electrokinetics measurements, sorption edge curves and sorption kinetics curves were also realized. The influence of the salt used for adjusting the ionic strength (NaClO4 and NaCl) and, as titanium dioxide exhibits strong photocatalytic properties, the influence of sunlight were also studied. A photoreduction processus from Se(VI) to Se(IV) was evidenced. The second part of this manuscript presents some exploratory works dealing with innovative spectroscopies like Near-Field Luminescence applied to the study of Eu3+ interaction with an aluminate glass and a model clay : dickite.
Complete list of metadatas

Cited literature [217 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01748275
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 11:30:18 AM
Last modification on : Thursday, May 24, 2018 - 10:32:01 AM
Long-term archiving on: Friday, September 14, 2018 - 7:18:31 AM

File

SCD_T_2007_0085_CREMEL.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01748275, version 1

Citation

Sébastien Cremel. Contribution à l'étude des interactions ions-surfaces : application aux systèmes Se(IV), Se(VI), U(VI) sur TiO2 rutile et Eu(III) sur dickite. Autre. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10085⟩. ⟨tel-01748275⟩

Share

Metrics

Record views

27

Files downloads

70