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

doi:10.1088/1742-6596/712/1/012085

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 journal › Conference article in journal › peer-review

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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 language	English
Article number	012085
Number of pages	6
Journal	Journal of Physics: Conference Series
Volume	712
DOIs	https://doi.org/10.1088/1742-6596/712/1/012085
Publication status	Published - 2016
Externally published	Yes
Event	16th International Conference on X-Ray Absorption Fine Structure - Karlsruhe, Germany Duration: 23 Aug 2015 → 28 Aug 2015

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Programme Area 2: Water Resources

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10.1088/1742-6596/712/1/012085Licence: CC BY

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title = "XAS signatures of Am(III) adsorbed onto magnetite and maghemite",

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.",

author = "N. Finck and L. Radulescu and D. Schild and M. Rothmeier and F. Huber and J. L{\"u}tzenkirchen and T. Rabung and F. Heberling and M.L. Schlegel and K. Dideriksen and S. Nedel and H. Geckeis",

year = "2016",

doi = "10.1088/1742-6596/712/1/012085",

language = "English",

volume = "712",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

publisher = "IOP Publishing Ltd.",

note = "16th International Conference on X-Ray Absorption Fine Structure, XAFS 2015 ; Conference date: 23-08-2015 Through 28-08-2015",

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TY - JOUR

T1 - XAS signatures of Am(III) adsorbed onto magnetite and maghemite

AU - Finck, N.

AU - Radulescu, L.

AU - Schild, D.

AU - Rothmeier, M.

AU - Huber, F.

AU - Lützenkirchen, J.

AU - Rabung, T.

AU - Heberling, F.

AU - Schlegel, M.L.

AU - Dideriksen, K.

AU - Nedel, S.

AU - Geckeis, H.

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84978719329&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/712/1/012085

DO - 10.1088/1742-6596/712/1/012085

M3 - Conference article in journal

AN - SCOPUS:84978719329

SN - 1742-6588

VL - 712

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

M1 - 012085

T2 - 16th International Conference on X-Ray Absorption Fine Structure

Y2 - 23 August 2015 through 28 August 2015

ER -

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

Abstract

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