Evaluation of novel getters for adsorption of radioiodine from groundwater and waste glass leachates

Autor:	Kent E. Parker, R. J. Serne, S. V. Mattigod, Glen E. Fryxell
Rok vydání:	2003
Předmět:	chemistry.chemical_classification Adsorption Chemistry Getter Inorganic chemistry Radiochemistry Vadose zone Iodide Leaching (metallurgy) Leachate Physical and Theoretical Chemistry Mesoporous silica Chemical decomposition
Zdroj:	Radiochimica Acta. 91:539-546
ISSN:	2193-3405 0033-8230
DOI:	10.1524/ract.91.9.539.20001
Popis:	Summary Performance tests were conducted using novel getter materials that can immobilize or delay the transport of radioiodine that would be released during physical and chemical degradation of solidified low-level waste packages. The results showed that metal-capped novel getters such as Hg-thiol and Ag-thiol Self-Assembled Monolayers on Mesoporous Silica (SAMMS), designed specifically to adsorb soft anions such as I-, had very high affinities for adsorption of radioiodine (K d ∼ 1×104 – 4×105 ml/g). The iodide adsorption performance of these novel getters was from one to two orders of magnitude better than many natural mineral and modified mineral getters. These data indicate that the novel getter materials are capable of significantly retarding the mobility of radioiodine leaching from physically and chemically weathered low-level waste glass packages during various physical and chemical weathering reactions expected during long-term disposal in the vadose zone.
Databáze:	OpenAIRE
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