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Experimental adsorption studies on different materials selected for developing a permeable reactive barrier for radiocesium retention

Published online by Cambridge University Press:  03 July 2014

Miguel García-Gutiérrez ,
Tiziana Missana ,
Ana Benedicto ,
Carlos Ayora  and
Katrien DePourcq
Miguel García-Gutiérrez
Affiliation:
CIEMAT, Departamento de Medioambiente, Av. Complutense 40, 28040 Madrid (SPAIN).
Tiziana Missana
Affiliation:
CIEMAT, Departamento de Medioambiente, Av. Complutense 40, 28040 Madrid (SPAIN).
Ana Benedicto
Affiliation:
CIEMAT, Departamento de Medioambiente, Av. Complutense 40, 28040 Madrid (SPAIN).
Carlos Ayora
Affiliation:
IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona (SPAIN)
Katrien DePourcq
Affiliation:
IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona (SPAIN)
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Abstract

Cs-137 was accidentally spilled in an industrial waste repository located in a salt marsh in southern Spain, and a permeable reactive barrier was proposed to retain it. Cs adsorption properties of different natural clayey materials were analyzed. The salt marsh waters show high salinity and high chemical variability, therefore Cs adsorption was also analyzed in the presence of competitive ions, especially K+ and NH4+.

Cs adsorption was non-linear in all the analyzed materials, indicating more than one adsorption sites with different selectivity. It was shown that in mixed clay systems with illite, montmorillonite and kaolinite, the presence of illite favors Cs retention at low and medium Cs loadings and montmorillonite at high Cs loadings. In the presence of illite and montmorillonite, kaolinite plays almost no role in Cs retention. The presence of K+ and NH4+ significantly hinders cesium adsorption.

Keywords

adsorptionCsgeologic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 117 - 122
Copyright
Copyright © Materials Research Society 2014 

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References

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