HYDROLYSIS OF URANIUM AND THORIUM IN SURFACE-MODIFIED BENTONITE UNDERHYDROTHERMAL CONDITIONS

Authors
GIAQUINTA DM SODERHOLM L YUCHS SE WASSERMAN SR
Citation
Dm. Giaquinta et al., HYDROLYSIS OF URANIUM AND THORIUM IN SURFACE-MODIFIED BENTONITE UNDERHYDROTHERMAL CONDITIONS, Journal of alloys and compounds, 249(1-2), 1997, pp. 142-145
Citations number
34
Categorie Soggetti
Chemistry Physical","Metallurgy & Metallurigical Engineering","Material Science
Journal title
Journal of alloys and compounds → ACNP
ISSN journal
09258388
Volume
249
Issue
1-2
Year of publication
1997
Pages
142 - 145
Database
ISI
SICI code
0925-8388(1997)249:1-2<142:HOUATI>2.0.ZU;2-F
Abstract
The speciation of (UO2)(2+)- and Th4+-exchanged bentonite clay samples was probed by X-ray absorption spectroscopy (XAS). Surface modificati on reactions using hydrophobic silanes were performed in order to asce rtain the effects of excluding the free exchange of external water fro m the clay gallery. Hydrothermal conditions were used to mimic potenti al geologic conditions in a nuclear waste storage facility. Both the ( UO2)(2+) and Th4+ samples showed evidence of polymeric hydrolysis prod ucts similar to the fluorite structure known for both UO2 and ThO2.