Removal of Pertechnetate from Simulated Nuclear Waste Streams Using Supported Zerovalent Iron

Autor:	Bettina Schrick, David K. Shuh, Thomas E. Mallouk, Alexandra B. Amonette, Deborah Sd Burke, Dana L. Caulder, John G. Darab, Sherman M. Ponder, Wayne W. Lukens, Robert D. Orr
Rok vydání:	2007
Předmět:	Zerovalent iron Sorbent Pertechnetate Ion exchange Environmental remediation Hanford Site Silica gel General Chemical Engineering Radiochemistry Radioactive waste General Chemistry chemistry.chemical_compound chemistry Materials Chemistry
Zdroj:	Chemistry of Materials. 19:5703-5713
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm0607379
Popis:	The application of nanoparticles of predominantly zerovalent iron (nanoiron), either unsupported or supported, to the separation and reduction of pertechnetate anions (TcO4-) from complex waste mixtures was investigated as an alternative approach to current waste-processing schemes. Although applicable to pertechnetate-containing waste streams in general, the research discussed here was directed at two specific potential applications at the U.S. Department of Energy's Hanford Site: (1) the direct removal of pertechnetate from highly alkaline solutions, typical of those found in Hanford tank waste, and (2) the removal of dilute pertechnetate from near-neutral solutions, typical of the eluate streams from commercial organic ion-exchange resins that may be used to remediate Hanford tank wastes. It was envisioned that both applications would involve the subsequent encapsulation of the loaded sorbent material into a separate waste form. A high surface area (>200 m2/g) base-stable, nanocrystalline zirconia was...
Databáze:	OpenAIRE
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