Leach Resistant Cesium and Strontium-bearing Wasteforms from Hexagonal Tungsten Bronze-Polyacrylonitrile Composite Adsorbers View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2006

AUTHORS

Christopher S. Griffith, Vittorio Luca, Ferdinand Sebesta, Patrick Yee, Elizabeth Drabarek

ABSTRACT

ABSTRACT Immobilization of adsorbed Cs + and Sr 2+ 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 °C. Thermal treatment of the parent composite material at 800 – 1000 °C undergoes a ca. 60% reduction in volume and retains its spherical morphology. For materials prepared at 800 – 1200 °C the full complement of Cs + and the majority of Sr 2+ partition into HTB phases (A∼0.16-0.3MO 3 ; A = Cs, Sr, Na; M = Mo,W), along with sodium cations. The presence of high concentrations of Na + relative to either Cs + or Sr 2+ does not appear to interfere with the formation of the HTB phase. The fraction ( f ) of Cs + and Sr 2+ leached from the tungstate phase assemblages is better or comparable with cesium hollandite (Cs 0.8 Ba 0.4 Ti 8 O 18 ; f = ca. 8 × 10 −5 ; rate = <1.2 × 10 −4 g m −2 d −1 ) and strontium titanate (SrTiO 3 ; f = 3.1 × 10 −3 ; rate = 2.63 × 10 −4 g m −2 day ×1 ), respectively, using a modified PCT test. Furthermore, where aggressive leaching conditions are employed (0.1M HNO 3 ; 150 o C; 4 days), the tungstate phase assemblages display leach resistance orders of magnitude better than the reference phases (Cs + - f = ca. 5 × 10 −3 ; rate = ca. 1.4 × 10 −3 g m −2 day −1 ; Sr 2+ - f = ca. 8 × 10 −2 ; rate = ca. 2.5 × 10 −2 g m −2 day −1 ). More... »

PAGES

79.1

Identifiers

URI

http://scigraph.springernature.com/pub.10.1557/proc-932-79.1

DOI

http://dx.doi.org/10.1557/proc-932-79.1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1067961576


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