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Addition of Al2O3 nanoparticles to bentonite: effects on surface charge and Cd sorption properties

Published online by Cambridge University Press:  01 July 2014

Natalia Mayordomo ,
Ursula Alonso ,
Tiziana Missana ,
Ana Benedicto  and
Miguel García-Gutiérrez
Natalia Mayordomo
Affiliation:
CIEMAT, Department of Environment, Avenida Complutense 40 28040 Madrid (SPAIN)
Ursula Alonso
Affiliation:
CIEMAT, Department of Environment, Avenida Complutense 40 28040 Madrid (SPAIN)
Tiziana Missana
Affiliation:
CIEMAT, Department of Environment, Avenida Complutense 40 28040 Madrid (SPAIN)
Ana Benedicto
Affiliation:
CIEMAT, Department of Environment, Avenida Complutense 40 28040 Madrid (SPAIN)
Miguel García-Gutiérrez
Affiliation:
CIEMAT, Department of Environment, Avenida Complutense 40 28040 Madrid (SPAIN)
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Abstract

Compacted bentonite barrier in radioactive waste repositories is expected to prevent radionuclide migration, due to its high sorption capability for many radionuclides. This study analyses whether the addition of Al2O3 nanoparticles (NPs) enhances the sorption properties of bentonite. The study was carried out with 109Cd, highly pollutant heavy metal and divalent fission product. Sorption experiments were conducted in NaClO4 at different ionic strengths (5·10-4 to 10-1 M) and pH (2 to 10), using mixtures of sodium homoionised bentonite and Al2O3 in different proportions.

It has been probed that addition of Al2O3 NPs to bentonite enhances Cd sorption at pH higher than 6. The effect of Al2O3 NPs addition on the surface properties of bentonite colloids was also analyzed by measuring particle size and surface charge in all studied systems.

Keywords

Cdadsorptiongeologic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 131 - 137
Copyright
Copyright © Materials Research Society 2014 

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