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Umbite Type Zirconium Germanates for Cs Removal

Published online by Cambridge University Press:  13 February 2017

Ryan George  and
Joseph A. Hriljac
Ryan George
Affiliation:
School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
Joseph A. Hriljac*
Affiliation:
School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
*
*(Email: j.a.hriljac@bham.ac.uk)
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Abstract

Pure and Nb-doped zirconium germanate materials of composition K2-xZr1-xNbxGe3O9.H2O where x = 0, 0.1, 0.2 and 0.3 with the structure of the natural mineral umbite have been prepared in high yield using hydrothermal synthesis methods. The parent material displays virtually no ion exchange of the K+ for Cs+ but the doped materials show rapidly enhanced exchange with replacement of ca. 70% of the K+ by Cs+ for the 30% doped material. Rietveld analysis of the powder X-ray diffraction data is consistent with no change in the unit cell parameters or K+ bonding prior to the exchange, hence we propose the improved property is due to the creation of cation defect sites within the pores of the material that facilities greater cation mobility and leads to exchange.

Keywords

ion-exchange materialCswaste management
Type
Articles
Information
MRS Advances , Volume 2 , Issue 13: Scientific Basis for Nuclear Waste Management XL , 2017 , pp. 729 - 734
Copyright
Copyright © Materials Research Society 2017 

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