XAS signatures of Am(III) adsorbed onto magnetite and maghemite

N. Finck, L. Radulescu, D. Schild, M. Rothmeier, F. Huber, J. Lützenkirchen, T. Rabung, F. Heberling, M.L. Schlegel, K. Dideriksen, S. Nedel, H. Geckeis

Research output: Contribution to journalConference article in journalpeer-review

8 Citations (Scopus)

Abstract

Trivalent americium was adsorbed on magnetite and maghemite under similar chemical conditions and the local environment probed by EXAFS spectroscopy. In both samples, partially hydrated Am(III) binds the surface but slightly different surface complexes were identified. On Fe3O4, Am(III) forms monomeric tridentate surface complexes similar to that reported for Pu(III) at the (111) surface. In contrast, the lower number of detected Fe atoms may suggest that Am(III) forms monomeric bidentate surface complexes on γ-Fe2O3. Alternatively, the lower Fe coordination number can also be due to the presence of vacancies in maghemite. XPS data imply very similar binding environments for Am at both Fe oxide surfaces.

Original languageEnglish
Article number012085
Number of pages6
JournalJournal of Physics: Conference Series
Volume712
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event16th International Conference on X-Ray Absorption Fine Structure - Karlsruhe, Germany
Duration: 23 Aug 201528 Aug 2015

Programme Area

  • Programme Area 2: Water Resources

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