TY - JOUR
T1 - Spectroscopic investigation of uranyl(VI) and citrate coadsorption to Al2O3
AU - Pasilis, Sofie P.
AU - Pemberton, Jeanne E.
N1 - Funding Information:
The authors gratefully acknowledge partial support of this research by the National Institutes of Health through the University of Arizona-Northern Arizona University Native American Cancer Research Partnership funded through the Minority Institute Cancer Control Program of the National Cancer Institute (U54CA96281). Partial support of this work was also provided by Idaho National Engineering and Environmental Laboratory through a contract from Bechtel Idaho (DE-AC07-99ID13727).
PY - 2008/1/15
Y1 - 2008/1/15
N2 - ATR-FTIR spectroscopy is used to understand the adsorption of uranyl-citrate complexes to Al2O3. Spectral data indicate that uranyl-citrate complexes partially dissociate upon adsorption, allowing full or partial hydrolysis of the uranyl ion. Kads values determined for free citrate adsorption are similar to those for citrate in uranyl-citrate complexes, indicating that the complexation of uranyl by citrate does not significantly affect the ability of citrate to bond with the surface. The isotherm data also indicate enhanced citrate adsorption to Al2O3 in the presence of uranyl, suggesting that uranyl may be the central link between two citrate ligands, and that uranyl is associated with the surface through a bridging citrate ligand. Finally, uranyl-citrate complexes interact with citrate adsorbed to Al2O3 through outer sphere interactions.
AB - ATR-FTIR spectroscopy is used to understand the adsorption of uranyl-citrate complexes to Al2O3. Spectral data indicate that uranyl-citrate complexes partially dissociate upon adsorption, allowing full or partial hydrolysis of the uranyl ion. Kads values determined for free citrate adsorption are similar to those for citrate in uranyl-citrate complexes, indicating that the complexation of uranyl by citrate does not significantly affect the ability of citrate to bond with the surface. The isotherm data also indicate enhanced citrate adsorption to Al2O3 in the presence of uranyl, suggesting that uranyl may be the central link between two citrate ligands, and that uranyl is associated with the surface through a bridging citrate ligand. Finally, uranyl-citrate complexes interact with citrate adsorbed to Al2O3 through outer sphere interactions.
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U2 - 10.1016/j.gca.2007.09.036
DO - 10.1016/j.gca.2007.09.036
M3 - Article
AN - SCOPUS:37549024656
SN - 0016-7037
VL - 72
SP - 277
EP - 287
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
IS - 2
ER -