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DOI 10.2172/833731
Title New Metal Niobate and Silicotitanate Ion Exchangers: Development and Characterization
Creator/Author Su, Yali ; Nenoff, Tina M. ; Navrotsky, Alexandra
Publication Date2001 Jun 01
OSTI IdentifierOSTI ID: 833731
Report Number(s)EMSP-73748--2001
DOE Contract NumberFG07-97ER45674
Other Number(s)R&D Project: EMSP 73748; TRN: US200430%%1766
Resource TypeTechnical Report
CoverageAnnual
Resource RelationOther Information: PBD: 1 Jun 2001
Research OrgPacific Northwest National Lab., Richland, WA; Sandia National Labs., Albuquerque, NM; University of California, Davis, Davis CA (US)
Sponsoring OrgUSDOE Office of Environmental Management (EM) (US)
Subject11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; ACTINIDES; CERAMICS; CESIUM; HEAT TREATMENTS; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; KINETICS; NIOBATES; NUCLEAR FUELS; PEROVSKITE; RAMAN SPECTROSCOPY; SEPARATION PROCESSES; STOICHIOMETRY; SYNTHETIC ROCKS; TITANATES; WASTE FORMS; X-RAY DIFFRACTION
Description/Abstract This project is a continuing EMSP project entitled ''New Silicotitanate Waste Forms: Development and Characterization.'' In our original study, the phase selection and chemical durability of silicotitanates (including commercially available IE-911) as a function of temperature (500 to 1000 C) was fully characterized by a combination of techniques including XRD, TEM, SEM, NMR, Raman spectroscopy, XAFS, XANES, and by thermodynamic studies. In addition, work on this program led to new discoveries not anticipated in the originally proposed research. Of particular importance was the discovery of a new ion exchange material that is selective for divalent cations under extreme conditions (e.g., acid solutions, competing cations), thus providing an alternative for removing Sr from mixed wastes. This material is converted easily by high-temperature, in situ heat treatment into a perovskite phase, which is also a major component of Synroc, a titanate ceramic waste form used for sequestration of high-level waste (HLW) from reprocessed, spent nuclear fuel. This renewal project is based on the current needs in separation of cesium and strontium and the results obtained from our previous EMSP work. The purpose of this project is to deliver pertinent information that can be used to make rational decisions on selection of separation processes for cesium, strontium, and actinides. The objectives of this project are: (1) to establish the structure/property relationship between inorganic ion exchanger materials and their ability to selectively separate divalent cations under extreme operating conditions-This includes optimizing stoichiometry, synthesis, and pretreatment conditions for metal niobate and silicotitanate ion exchangers for maximum strontium and actinide-surrogate selectivity. (2) to fully characterize the phase relationships, structures, and thermodynamic and kinetic stabilities of these new phases and their related condensed phases (as potential ceramic waste forms) (3) to understand the chemical and thermodynamic stabilities of silicotitanate ion exchangers based on an in-depth comprehension of local bonding configurations and thermochemistry (4) to apply fundamental understanding to tailoring an ion exchanger that is ideally suited for a DOE needs and therefore has the potential for short-term deployment in the DOE complex.
Country of PublicationUnited States
LanguageEnglish
FormatSize: vp.
System Entry Date2007 Apr 23

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