Journal
APPLIED SURFACE SCIENCE
Volume 253, Issue 21, Pages 8794-8797Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2007.04.076
Keywords
uranium; magnetite; spent nuclear fuel; EXAFS; XPS
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The uranium sorbed onto commercial magnetite has been characterized by using two different spectroscopic techniques such as X-ray photoelectron spectroscopy (XPS), and extended X-ray absorption fine structure (EXAFS). Magnetite samples have been put in contact with uranium(VI) solutions in conditions in which a high uranium uptake is expected. After several days, the magnetite surface has been analysed by XPS and EXAFS. The XPS results obtained are not conclusive regarding the uranium oxidation state in the magnetite surface. On the other hand, the results obtained with the EXAFS technique show that the uranium-magnetite sample spectrum has characteristics from both the UO, and schoepite spectra, e.g. a relatively high coordination number of equatorial oxygens and two axial oxygens, respectively. These results would indicate that the uranium sorbed onto magnetite would be a mixture of uranium(IV) and uranium(VI). (c) 2007 Elsevier B.V. All rights reserved.
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