Abstract
Sorption behavior of uranium onto silica colloids is studied to derive surface complexation data. Several spectroscopic and structural methods, i.e., Time-resolved Laser-induced Fluorescence (TRLIF), X-ray Absorption Fine Structure (XAFS), and Small-angle X-ray Scattering (SAXS) are employed for characterization of colloid suspensions and surface-sorbed species. TRLIF and EXAFS allowed identification of two principal uranium species on the silica surface – bidentate coordinated uranyl complexes of the following stoichiometries (≡SiO)2UO2 and (≡SiO)2UO2OH−. No polynuclear species or surface precipitates are formed as shown by EXAFS and SAXS examination of suspensions at various silica/uranium ratios. However, when uranium coverage of the silica surface exceeds 7%, the colloid stability as determined by electrophoretic mobility increases. Potentially, this could affect colloid-facilitated transport.
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Acknowledgments
We acknowledge financial support as a Joint Research Group between the German Helmholtz Society and the Russian Basic Research Foundation (HRJRG-011 and 07-03-92280-SIG_a) and from the President of Russian Federation Grant (to SNK, # MD- 7150.2010.3).
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Batuk, D.N. et al. (2011). Sorption and Speciation of Uranium on Silica Colloids. In: Kalmykov, S., Denecke, M. (eds) Actinide Nanoparticle Research. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11432-8_11
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DOI: https://doi.org/10.1007/978-3-642-11432-8_11
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