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The Structure of Actinide Ions Exchanged into Native and Modified Zeolites and Clays

Published online by Cambridge University Press:  10 February 2011

Stephen R. Wasserman ,
L. Soderholm  and
Daniel M. Giaquinta
Stephen R. Wasserman
Affiliation:
Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne IL, 60439
L. Soderholm
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne IL 60439
Daniel M. Giaquinta
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne IL 60439
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Abstract

x-ray absorption spectroscopy (XAS) has been used to investigate the structure and valence of thorium (Th4+) and uranyl () cations exchanged into two classes of microporous aluminosilicate minerals: zeolites and smectite clays. XAS is also employed to examine the fate of the exchanged cations after modification of the mineral surface using self-assembled organic films and/or exposure to hydrothermal conditions. These treatments serve as models for the forces that ultimately determine the chemical fate of the actinide cations in the environment. The speciation of the cations depends on the pore size of the aluminosilicate, which is fixed for the zeolites and variable for the smectites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 590: Symposium R – Applications of Synchrotron Radiation Techniques…V , 1999 , 39
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

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