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Title New Metal Niobate and Silicotitanate Ion Exchangers: Development and Characterization
Creator/Author Su, Yali ; Li, Liyu ; Nenoff, Tina M. ; Nyman, May ; Navrotsky, Alexnadra ; Xu, Hongwu
Publication Date2003 Sep 11
OSTI IdentifierOSTI ID: 826238
Other Number(s)TRN: US200425%%58
Resource TypeConference
Resource RelationConference: 226th American Chemical Society Meeting, New York, NY (US), 09/07/2003--09/11/2003; Other Information: PBD: 11 Sep 2003
Research OrgArizona State University, Tempe, AZ; Pacific Northwest National Lab., Richland, WA; Sandia National Labs., Albuquerque, NM; University of California, Davis, CA (US)
Sponsoring OrgUSDOE Office of Science (SC) (US)
Subject12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CERAMICS; ION EXCHANGE MATERIALS; NIOBATES; PEROVSKITES; REMOVAL; SOLVENT EXTRACTION; STABILITY; THERMODYNAMICS; WASTE FORMS; WASTES
Description/Abstract We are evaluating new metal niobate and silicotitanate ion exchangers for Cs and Sr removal and their related condensed phases as potential ceramic waste forms. The goal of the program is to provide DOE alternative materials that can exceed the solvent extraction process for removing Cs and Sr from high level wastes and technical alternatives for disposal of silicotitanate and niobate based ion exchange materials. To date we have determined the structural property relationship and thermodynamic stability of new silicotitanate and niobate based ion exchangers and their thermally converted phases. Several new phases include Na2Nb2-xMIV xO6-x(OH)x {center_dot} H2O (MIV=Ti, Zr, x=0.04 {approx} 0.4, SOMS), NaTixNb1-xO3-0.5x, Na2-xMxNb1.6Ti0.4O5.8+yx (M=Sr, Y), CsTixAl1-xSi2O6+x/2 (0 x 1), and Cc- A2TiSi6O15 (A=K, Rb, Cs) have been synthesized and characterized and results will be presented. Additionally, chemical, thermal, radiation, and thermodynamic stabilities of the new ion exchange materials and their related perovskites as potential ceramic waste forms will also be presented at the meeting.
Country of PublicationUnited States
LanguageEnglish
FormatSize: vp.
AvailabilityAmerican Chemical Society Meeting
System Entry Date2004 Sep 06

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