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New Crystalline Silicotitanate (CST) Waste Forms: Hydrothermal Synthesis and Characterization of CS-SI-TI-O Phases

Published online by Cambridge University Press:  10 February 2011

M. Nyman ,
T. M. Nenoff ,
Y. Su ,
M. L. Balmer ,
A. Navrotsky  and
H. Xu
M. Nyman
Affiliation:
Sandia National Labs, Org. 1845, M.S. 0710. Albuquerque, N.M. 87185-0710
T. M. Nenoff
Affiliation:
Sandia National Labs, Org. 1845, M.S. 0710. Albuquerque, N.M. 87185-0710
Y. Su
Affiliation:
Pacific Northwest Labs, P.O. Box 999, MSIN K8-93, Battelle Blvd., Richland, WA 99352
M. L. Balmer
Affiliation:
Pacific Northwest Labs, P.O. Box 999, MSIN K8-93, Battelle Blvd., Richland, WA 99352
A. Navrotsky
Affiliation:
U.C. Davis, Dept. of Chem. Eng. and Mat. Sci. U.C. Davis, Davis, CA 95616
H. Xu
Affiliation:
U.C. Davis, Dept. of Chem. Eng. and Mat. Sci. U.C. Davis, Davis, CA 95616
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Abstract

The radioactivity of the Hanford site waste tanks is primarily from 137Cs and 90Sr, of which can both be selectively removed from solution using a crystalline silicotitanate (CST) ion exchanger. We are currently seeking waste forms alternative to borosilicate glass for Cs-CSTs. In order to obtain a fundamental basis for the development of an alternative waste form, we are investigating synthesis and characterization of CST component phases, namely Cs-Si-Ti-O phases. Two novel Cs-Ti-Si-O phases (one porous, one condensed) have been hydrothermally synthesized, characterized and evaluated as waste form candidates based on chemical and thermal stability, leachability, and ion exchange capabilities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 71
Copyright
Copyright © Materials Research Society 1999

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References

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