Sorption of trivalent plutonium onto UO2 and the effect of the solid phase on the Pu oxidation state
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Mattias Olsson
Summary
A problem with plutonium in sorption studies is its tendency to occur in a mix of oxidation states. This work was a study of the sorption of plutonium on the solid phase UO2 — in a perchlorate medium as a function of pH — where plutonium is kept in its trivalent oxidation state. Experiments also showed that uranium(IV) oxide can reduce Pu(IV) to Pu(III) in an acidic solution and maintain it in that state. It was observed at the same time that the chemically inert solid phases TiO2 and ThO2 possibly increase the rate of disproportionation of Pu(IV) at a pH of about 0.5. In accordance with previous studies MnO2 was found to have an oxidizing effect, converting Pu(IV) into Pu(VI).
A comparison is made between the sorption of Th(IV), Pu(III) and Co(II) on UO2 and TiO2, and Pu(VI) on TiO2.
© by Oldenbourg Wissenschaftsverlag, München
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Articles in the same Issue
- Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched 112Sn targets with reference to 111In production via radioisotope generator 112Sn(n, 2n)111Sn → 111In
- Study on some physical chemistry aspects of extraction of uranium(VI) with bis(octylsulfinyl)methane
- Adsorption modeling and thermodynamic characteristics of uranium(VI) ions onto 1-(2-pyridylazo)-2-naphthol (PAN) supported polyurethane foam
- Sorption of trivalent plutonium onto UO2 and the effect of the solid phase on the Pu oxidation state
- Solubility of uranium(IV) hydrous oxide in high pH solution under reducing condition
- Recovery of minor actinides from HLLW using the DIAMEX process
- Towards a DIAMEX process using high active concentrate. Production of genuine solutions
- The mobility of anthropogenic 129I in a shallow sand aquifer at Sturgeon Falls, Ontario, Canada
