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Cs+ and Sr2+ Ion-Exchange Properties of Microporous Tungstates

Published online by Cambridge University Press:  01 February 2011

Vittorio Luca
Affiliation:
Materials and Engineering Sciences, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, AUSTRALIA
Christopher S. Griffith
Affiliation:
Materials and Engineering Sciences, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, AUSTRALIA
Harriet Chronis
Affiliation:
Materials and Engineering Sciences, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, AUSTRALIA
Jonathan Widjaja
Affiliation:
Materials and Engineering Sciences, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, AUSTRALIA
Huijun Li
Affiliation:
Materials and Engineering Sciences, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, AUSTRALIA
Nicholas Scales
Affiliation:
Materials and Engineering Sciences, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, AUSTRALIA
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Abstract

The hydrothermally prepared hexagonal tungsten bronze (HTB) phase displays promising distribution coefficients (KD) for both Cs+ (2 – 100 ppm) and Sr2+ (0.5 – 60 ppm) in acidic (1M HNO3) radioactive waste simulants. The development of an inorganic ion-exchanger that displays such selectivity has previously eluded researchers in this field. The selectivity for Cs+ and Sr2+ can be modulated by isomorphous substitution of molybdenum into the tungstate framework, and is optimum for material of nominal composition, Na0.2Mo0.03W0.97O3·zH2O (Mo-HTB). Both the parent HTB and Mo-HTB phases display fast ion-exchange kinetics for Cs+ and Sr2+ and cation exchange capacities ca. 50% that of the theoretical capacities of 0.9 and 0.45 mmol.g−1, respectively. The Mo-HTB adsorbent has a modest tolerance to alkali metal ions such as Na+ and K+ in acidic solutions with total Cs+ and Sr2+ uptake dropping by 66% as the concentration of Na+ increases from 9 mmol.L−1 to 1200 mmol L−1.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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