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We have examined the sorption of aqueous Pu(IV) and intrinsic Pu colloids to goethite across a Pu concentration range that spans the solubility of Pu(IV) hydrous oxide, at 25 and 80 ℃, and after equilibration for over 100 days. The strong affinity of aqueous Pu(IV) for the goethite surface is explained by the epitaxial growth of bcc Pu 4 O 7  nano-particles on goethite. The 3–5 nm Pu 4 O 7  nano-particles are strictly associated with goethite, widely dispersed across the goethite surface, and stable over the timescale of months at both 25 and 80 ℃. There is no indication that the sorbed Pu 4 O 7  nano-particles alter to PuO 2  over time. Intrinsic Pu colloids were identified by TEM as 3–5 nm PuO 2  nano-particles. They exhibit a weaker association with the goethite surface. Aggregation of PuO 2  nano-particles was observed. There is no indication that the PuO 2  nano-particles, once formed, will alter to Pu 4 O 7  on goethite. Based on supernatant Pu concentrations, PuO 2  nano-particle aggregation behavior is consistent with Pu(IV) hydrous oxide precipitation.

Plutonium sorption and precipitation in the presence of goethite at 25 and 80 ○ C

Plutonium sorption and precipitation in the presence of goethite at 25 and 80  ○ C