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Surface Characterization of Olivine-Rock by X-ray Photoelectron Spectroscopy (XPS). Leaching and U(VI) Sorption Experiments

Published online by Cambridge University Press:  10 February 2011

E. Rodrigues ,
F.Z. El Aamrani ,
J. Giménez ,
I. Casas ,
M.E. Torrero ,
J. de Pablo ,
L. Duro  and
K-H. Hellmuth
E. Rodrigues
Affiliation:
Department of Chemical Engineering, Universitat Politècnica de Catalunya. ETSEIB, Diagonal 647. E-08028 Barcelona. Spain
F.Z. El Aamrani
Affiliation:
Department of Chemical Engineering, Universitat Politècnica de Catalunya. ETSEIB, Diagonal 647. E-08028 Barcelona. Spain
J. Giménez
Affiliation:
Department of Chemical Engineering, Universitat Politècnica de Catalunya. ETSEIB, Diagonal 647. E-08028 Barcelona. Spain
I. Casas
Affiliation:
Department of Chemical Engineering, Universitat Politècnica de Catalunya. ETSEIB, Diagonal 647. E-08028 Barcelona. Spain
M.E. Torrero
Affiliation:
Department of Chemical Engineering, Universitat Politècnica de Catalunya. ETSEIB, Diagonal 647. E-08028 Barcelona. Spain
J. de Pablo
Affiliation:
Department of Chemical Engineering, Universitat Politècnica de Catalunya. ETSEIB, Diagonal 647. E-08028 Barcelona. Spain
L. Duro
Affiliation:
QuantiSci S.L.. CENT, Pare Tecnològic del Vallès 08290 Cerdanyola del Valles. Spain
K-H. Hellmuth
Affiliation:
Finnish Centre for Radiation and Nuclear Safety P.O. BOX 268 SF-00101 Helsinki. Finland
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Abstract

High-FeO olivine-rock from Lovasjäarvi intrusion (SE-Finland) has been suggested as redox-active backfill-additive in deep high level nuclear waste repositories. In this w'ork, surface characterization of olivine-rock by X-Ray Photoelectron Spectroscopy (XPS) has been used in order to assess the behavior of this rock during leaching experiments and sorption properties of redox sensitive radionuclides. Uranium (VI) sorption has also been performed. Olivine leaching experiments at basic pH have shown the abundance of Fe and 0 relative to Si and Mg clearly indicating the precipitation of a Fe(III)-oxide secondary phase, probably amorphous FeOOH. At acid pH, the decrease of Mg/Si and Fe/Si ratios can be attributed to the formation of silicon dioxide on the mineral surface. The deconvolution of the 4f7 2 Uranium peak has shown the reduction of U(VI) to U(IV) onto the olivine surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 321
Copyright
Copyright © Materials Research Society 1998

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References

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