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Novel Functionalized Ceramic Getter Materials for Adsorption of Radioiodine.

Published online by Cambridge University Press:  11 February 2011

Shas V. Mattigod ,
Glen Fryxell ,
Kent Parker  and
Dan Kaplan
Shas V. Mattigod
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
Glen Fryxell
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
Kent Parker
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
Dan Kaplan
Affiliation:
Westinghouse Savannah River Company, Aiken, SC 29808
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Abstract

A new class of getter materials has been synthesized for immobilization of long-lived radionuclides such as 129I. These novel materials consist of nanoporous ceramic substrates with tailored pore sizes ranging from 2 – 20 nm. These high surface area (∼1000 m2/g) ceramic substrates have been functionalized with self-assembled monolayers consisting of soft cation-capped thiol-functionality. The resulting getter materials exhibit highly dense binding sites, and excellent selectivity for iodide. The effectiveness of these novel getter materials was evaluated using radioiodide-spiked samples of surface water and concrete leachate and adsorption performance was compared with natural sulfide mineral getter materials. The data indicated that the novel getter materials have very high affinity for radioiodide (Kd: 4 × 104 – 3 × 105ml/g and 6 × 105 ml/g in surface and concrete leachate respectively). Comparatively, the radioiodide Kd values for natural mineral getters were typically two to three orders magnitude less than the novel getters. The results indicated that the synthetic getter materials have the potential to immobilize and therefore retard the migration of 129I in the subsurface environment. Additional studies are being conducted to evaluate thelong-term stability of these materials in waste disposal environments.

Type
articles
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II8.7
Copyright
Copyright © Materials Research Society 2003

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