EXAFS studies of uranium sorption on layer-silicate minerals
Conference
·
OSTI ID:214985
- Lawrence Livermore National Lab., CA (United States); and others
The local structure of uranium sorbed on mineral surfaces was investigated by uranium L{sub 3}-edge EXAFS. Solutions of uranyl chloride, UO{sub 2}Cl{sub 2}, were exposed to vermiculite, an expansible layer silicate mineral, under conditions which favor sorption by either cation exchange or surface complexation. EXAFS of the resulting mineral samples indicates a larger distortion of the uranyl equatorial shell for cation exchange, possibly due to steric effects of interlayer sorption. The uranyl U-O axial bond distance is greater for surface complexation than for ion exchange. Uranyl sorption on talc and pyrophyllite, layer silicate minerals with essentially no cation-exchange capacity, gives results which generally support the trends for surface complexation on vermiculite.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 214985
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structure of uranium sorption complexes on alumino-silicate minerals studied by x-ray absorption spectroscopy
X-ray absorption studies of uranium sorption on mineral substrates
X-ray absorption studies of uranium sorption on mineral substrates
Conference
·
Tue Oct 01 00:00:00 EDT 1996
·
OSTI ID:370494
X-ray absorption studies of uranium sorption on mineral substrates
Conference
·
Mon Oct 31 23:00:00 EST 1994
·
OSTI ID:90683
X-ray absorption studies of uranium sorption on mineral substrates
Book
·
Fri Sep 01 00:00:00 EDT 1995
·
OSTI ID:99502