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Selective Ordering of Pertechnetate at the Interface between Amorphous Silica and Water: a Poisson Boltzmann Treatment

Published online by Cambridge University Press:  19 March 2015

Christopher D. Williams ,
Karl P. Travis ,
John H. Harding  and
Neil A. Burton
Christopher D. Williams
Affiliation:
Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, U.K. School of Chemistry, University of Manchester, Manchester, M13 9PL, U.K.
Karl P. Travis
Affiliation:
Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, U.K.
John H. Harding
Affiliation:
Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, U.K.
Neil A. Burton
Affiliation:
School of Chemistry, University of Manchester, Manchester, M13 9PL, U.K.
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Abstract

Calculations based on Poisson-Boltzmann theory are used to investigate the equilibrium properties of an electrolyte containing TcO4− and SO42− ions near the surface of amorphous silica. The calculations show that the concentration of TcO4− is greater than SO42− at distances less than 1 nm from the surface due to the negative charge density caused by deprotonation of the amorphous silica silanol groups. At lower pH, the surface becomes protonated and the magnitude of this effect is reduced. These results have implications for the potential use of oxyanion-SAMMS for the environmental remediation of water contaminated with 99Tc.

Keywords

surface chemistrywaste managemention-solid interactions
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1744: Symposium EE – Scientific Basis for Nuclear Waste Management XXXVIII , 2015 , pp. 53 - 58
Copyright
Copyright © Materials Research Society 2015 

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