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Network-like arrangement of mixed-valence uranium oxide nanoparticles after glutathione-induced reduction of uranium(VI)

Kretzschmar, J.; Haubitz, T.; Hübner, R.; Weiss, S.; Husar, R.; Brendler, V.; Stumpf, T.

Glutathione (GSH), a ubiquitous intracellular reducing tripeptide, is able to reduce hexavalent uranium, U(VI), to its tetravalent form, U(IV), in aqueous media in vitro, inducing the formation of nanocrystalline mixed-valence uranium oxide particles. After initial reduction to U(V) and subsequent dismutation, yielded U(IV) rapidly hydrolyses at near-neutral conditions forming 2–5 nm sized nanoparticles. The latter further aggregate to 20–40 nm chain-like building blocks that finally arrange as network-like structures.

Keywords: glutathione; uranium; redox reaction; uraninite; nanocrystal; TEM; environmental science

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Publ.-Id: 22173