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Surface Charge Densities of Two Actinide(IV) Oxides: UO2 and ThO2

Mattias Olsson (Institutionen för kärnkemi) ; Anna-Maria Jakobsson (Institutionen för kärnkemi) ; Yngve Albinsson (Institutionen för kärnkemi)
Journal of Colloid and Interface Science (0021-9797). Vol. 256 (2002), 2, p. 256-261.
[Artikel, refereegranskad vetenskaplig]

The surface charge behavior of uranium(IV) oxide and thorium(IV) oxide was investigated by potentiometric titration, and the pH point of zero charge (pzc) was determined for both oxides. Crystalline structures were investigated by X-ray powder diffraction, which showed that both oxides were of the cubic system (Fm3m) with a slightly differing unit cell size. The pzc was determined for the oxides at two ionic strengths: 0.01 and 0.1 M (NaClO4). The pzc of UO2 was found to be pH 5–5.5 at both ionic strengths, which was supported by measurement of the isoelectric point. The corresponding result for ThO2 was approximately pH 8, seemingly varying slightly with the ionic strength. The UO2 surface was sensitive to further oxidation, which affects titration experiments by yielding ostensibly high pzc unless the oxidation is prevented. Inert, or at least O2 and CO2 free, conditions are thus necessary during work with UO2.

Nyckelord: surface charge, point of zero charge, uranium oxide, potentiometric titration, actinides



Denna post skapades 2006-08-28.
CPL Pubid: 1544

 

Institutioner (Chalmers)

Institutionen för kärnkemi (1960-2002)

Ämnesområden

Kemi
Geovetenskap och miljövetenskap

Chalmers infrastruktur

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Surface Complexation Studies in An (Th, U(IV), Pu(VI)) Systems