Details
| Original language | English |
|---|---|
| Pages (from-to) | 240-245 |
| Number of pages | 6 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 302 |
| Issue number | 1 |
| Publication status | Published - 17 Jul 2006 |
| Externally published | Yes |
Abstract
Calcite homogeneously doped with Am(III) and Cm(III) was synthesized in a mixed-flow reactor. The mechanism of incorporation of these actinides (An) into calcite was investigated by time-resolved laser fluorescence spectroscopy. Two different An(III)/calcite species were found. One has been identified as ions bonded onto the calcite surface. The second An(III) species has lost its complete hydration sphere and is incorporated into the calcite bulk structure. Both Cm(III)/calcite and Am(III)/calcite complexes have been characterized by their fluorescence emission spectra and lifetimes. Structural parameters of the incorporated Am(III) species determined by EXAFS indicate a coordination number of 6.3 ± 0.6 and distances of 2.40 ± 0.01 Å for the first Am{single bond}O shell.
Keywords
- Americium, Calcite, Curium, Extended X-ray absorption fine structure (EXAFS), Solid solutions, Surface complexation, Time-resolved laser fluorescence spectroscopy (TRLFS)
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Biomaterials
- Materials Science(all)
- Surfaces, Coatings and Films
- Chemical Engineering(all)
- Colloid and Surface Chemistry
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In: Journal of Colloid and Interface Science, Vol. 302, No. 1, 17.07.2006, p. 240-245.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Structural characterization of Am incorporated into calcite
T2 - A TRLFS and EXAFS study
AU - Stumpf, Thosten
AU - Marques Fernandes, M.
AU - Walther, Clemens
AU - Dardenne, Kathy
AU - Fanghänel, Thomas
N1 - Funding information: We gratefully acknowledge the assistance of Annick Froideval during the EXAFS measurements. Thanks to Dirk Bosbach and Felix Brandt for fruitful discussions and for making the flow-through reactor available. This work was financed by the Helmholtz Gemeinschaft Deutscher Forschungszentren (HGF) by supporting the Helmholtz-Hochschul-Nachwuchsgruppe “Aufklärung geochemischer Reaktionsmechanismen an der Wasser/Mineralphasen Grenzfläche.”
PY - 2006/7/17
Y1 - 2006/7/17
N2 - Calcite homogeneously doped with Am(III) and Cm(III) was synthesized in a mixed-flow reactor. The mechanism of incorporation of these actinides (An) into calcite was investigated by time-resolved laser fluorescence spectroscopy. Two different An(III)/calcite species were found. One has been identified as ions bonded onto the calcite surface. The second An(III) species has lost its complete hydration sphere and is incorporated into the calcite bulk structure. Both Cm(III)/calcite and Am(III)/calcite complexes have been characterized by their fluorescence emission spectra and lifetimes. Structural parameters of the incorporated Am(III) species determined by EXAFS indicate a coordination number of 6.3 ± 0.6 and distances of 2.40 ± 0.01 Å for the first Am{single bond}O shell.
AB - Calcite homogeneously doped with Am(III) and Cm(III) was synthesized in a mixed-flow reactor. The mechanism of incorporation of these actinides (An) into calcite was investigated by time-resolved laser fluorescence spectroscopy. Two different An(III)/calcite species were found. One has been identified as ions bonded onto the calcite surface. The second An(III) species has lost its complete hydration sphere and is incorporated into the calcite bulk structure. Both Cm(III)/calcite and Am(III)/calcite complexes have been characterized by their fluorescence emission spectra and lifetimes. Structural parameters of the incorporated Am(III) species determined by EXAFS indicate a coordination number of 6.3 ± 0.6 and distances of 2.40 ± 0.01 Å for the first Am{single bond}O shell.
KW - Americium
KW - Calcite
KW - Curium
KW - Extended X-ray absorption fine structure (EXAFS)
KW - Solid solutions
KW - Surface complexation
KW - Time-resolved laser fluorescence spectroscopy (TRLFS)
UR - http://www.scopus.com/inward/record.url?scp=33747595200&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2006.06.010
DO - 10.1016/j.jcis.2006.06.010
M3 - Article
AN - SCOPUS:33747595200
VL - 302
SP - 240
EP - 245
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 1
ER -