Polyoxometalates for Radioactive Waste Treatment - Final Report - 06/15/1996 - 09/14/2000

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The research was directed primarily towards the use of polyoxometalate complexes for separation of lanthanide, actinide, and technetium species from aqueous waste solutions, such as the Hanford Tank Wastes. Selective binding of these species responsible for much of the high level waste (HWL) activity, can reduce the volume of material to be subsequently vitrified or otherwise converted for long-term storage. A secondary objective was to explore the direct conversion of the polyoxometalate complexes into possible waste forms, oxide bronzes, thereby avoiding additional handling and energy-intensive vitrification procedures. Although the advantages of polyoxometalate anions (POMs) lie in their high thermal and ... continued below

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Pope, Michael T. September 14, 2000.

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Description

The research was directed primarily towards the use of polyoxometalate complexes for separation of lanthanide, actinide, and technetium species from aqueous waste solutions, such as the Hanford Tank Wastes. Selective binding of these species responsible for much of the high level waste (HWL) activity, can reduce the volume of material to be subsequently vitrified or otherwise converted for long-term storage. A secondary objective was to explore the direct conversion of the polyoxometalate complexes into possible waste forms, oxide bronzes, thereby avoiding additional handling and energy-intensive vitrification procedures. Although the advantages of polyoxometalate anions (POMs) lie in their high thermal and radiolytical stabilities, that has been no attempt to exploit the remarkable variety of these complexes beyond the use of the two anions mentioned above. Our broad knowledge of POM chemistry has allowed us to address and rectify this omission. The innovative aspects of the project are: (a) the selective sequestration of lanthanide and actinide cations by a POM system in the presence of excess alkali and transition metal cations; (b) the formation of the first examples of POM complexes of UO2-2+ and their extraction into nonaqueous solvents; (c) the thermal conversion of ammonium salts of lanthanide and actinide POM complexes into inert oxide bronzes at relatively low temperatures; and (d) the direct formation of highly thermally-robust niobate and tantalate complexes of Re (surrogate for Tc) in highly basic solutions.

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INIS; OSTI as DE00790202

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  • Other Information: PBD: 14 Sep 2000

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  • Report No.: DOE/ER/14695
  • Report No.: Project Number 54716
  • Grant Number: FG07-96ER14695
  • DOI: 10.2172/790202 | External Link
  • Office of Scientific & Technical Information Report Number: 790202
  • Archival Resource Key: ark:/67531/metadc723516

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  • September 14, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 21, 2016, 7:41 p.m.

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Pope, Michael T. Polyoxometalates for Radioactive Waste Treatment - Final Report - 06/15/1996 - 09/14/2000, report, September 14, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc723516/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.