Leach Resistant Cesium and Strontium-bearing Wasteforms from Hexagonal Tungsten Bronze-Polyacrylonitrile Composite Adsor
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Leach Resistant Cesium and Strontium-bearing Wasteforms from Hexagonal Tungsten Bronze-Polyacrylonitrile Composite Adsorbers Christopher S. Griffitha*, Vittorio Lucaa, Ferdinand Sebestab, Patrick Yeea and Elizabeth Drabareka. a Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia; b Czech Technical University in Prague, Department of Nuclear Chemistry, Břehová 7, 115 19 Prague 1, Czech Republic
ABSTRACT Immobilization of adsorbed Cs+ and Sr2+ on a molybdenum-doped, hexagonal tungsten bronze (HTB)-polyacrylonitrile (PAN) composite adsorbent can be achieved by heating in air at temperatures in the range 600 - 1200 oC. Thermal treatment of the parent composite material at 800 – 1000 oC undergoes a ca. 60% reduction in volume and retains its spherical morphology. For materials prepared at 800 – 1200 oC the full complement of Cs+ and the majority of Sr2+ partition into HTB phases (A~0.16-0.3MO3; A = Cs, Sr, Na; M = Mo,W), along with sodium cations. The presence of high concentrations of Na+ relative to either Cs+ or Sr2+ does not appear to interfere with the formation of the HTB phase. The fraction (f) of Cs+ and Sr2+ leached from the tungstate phase assemblages is better or comparable with cesium hollandite (Cs0.8Ba0.4Ti8O18; f = ca. 8 x 10-5; rate =
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