Sorption of Cs(I) on Fe-montmorillonite relevant to geological disposal of HLW
-
Santosh Chikkamath
,
Vaibhavi V. Raut
Abstract
Bentonite is the candidate buffer and backfill material in the deep geological repositories. Montmorillonite (Mt) is the major clay minerals of bentonite. Over a long period of time, the interaction of corrosion products from overpack and/or cansister with clay minerals is expected to result in formation of Fe(III)-Mt, a plausible alterated product. In this context, it is important to understand the properties of Fe-Mt in comparison with original clay mineral, Na-Mt. In the present study, sorption behavior of Cs(I), long lived fission product (135Cs, t1/2 = 2.3 × 106 years; 137Cs, t1/2 = 30.1 years) with high fission yield, on Fe(III)-Mt is investigated. Batch sorption studies are conducted at varying pH (3–9), ionic strength (0.001–1 M) and Cs(I) concentration (10−10 to 0.05 M). The distribution coefficient (Kd) of Cs(I) on Fe(III)-Mt was found to be independent of pH except at low pH, indicating ion exchange mechanism as dominant interaction mode for Cs(I). It was further verified by ionic strength variation which depicted decrease in Cs(I) sorption with increasing ionic strength. Adsorption isotherm of Cs(I) was found to be linear over the concentration range of 10−10 to 10−3 M Cs(I). The Fe released from Fe(III)-Mt during the Cs(I) sorption was found to be not more than 0.2 ppm. However, on lowering the pH and increasing the ionic strength, the Fe release increased. Furthermore, the apparent diffusion coefficient for Cs(I) in Fe(III)-Mt has been determined.
Acknowledgments
Authors are thankful to funding agencies, BRNS/DAE [37(2)/14/20/2015/BRNS] and DST-FIST, Ministry of Science and Technology [SR/FST/CSI-273/2016], Govt. of India.
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Separation of neptunium from actinides by monoamides: a solvent extraction study
- Adsorption of Th(IV) on the modified multi-walled carbon nanotubes using central composite design
- Sorption of Cs(I) on Fe-montmorillonite relevant to geological disposal of HLW
- Sorption behavior of Co-radionuclides from radioactive waste solution on graphene enhanced by immobilized sugarcane and carboxy methyl cellulose
- Preparation of chitosan functionalized polyamidoamine for the separation of trivalent lanthanides from acidic waste solution
- Understanding the recovery of Ruthenium from acidic feeds by oxidative solvent extraction studies
- Radiochemical evidence for the contribution of iron (using 59Fe) remobilization efficiency towards nitrogen (N) and Fe deficiency tolerance in wheat
- Studies on the radiolytic degradation of N,N-dioctyl-2-hydroxyacetamide using dynamic light scattering and ATR-FTIR spectroscopy
Articles in the same Issue
- Frontmatter
- Separation of neptunium from actinides by monoamides: a solvent extraction study
- Adsorption of Th(IV) on the modified multi-walled carbon nanotubes using central composite design
- Sorption of Cs(I) on Fe-montmorillonite relevant to geological disposal of HLW
- Sorption behavior of Co-radionuclides from radioactive waste solution on graphene enhanced by immobilized sugarcane and carboxy methyl cellulose
- Preparation of chitosan functionalized polyamidoamine for the separation of trivalent lanthanides from acidic waste solution
- Understanding the recovery of Ruthenium from acidic feeds by oxidative solvent extraction studies
- Radiochemical evidence for the contribution of iron (using 59Fe) remobilization efficiency towards nitrogen (N) and Fe deficiency tolerance in wheat
- Studies on the radiolytic degradation of N,N-dioctyl-2-hydroxyacetamide using dynamic light scattering and ATR-FTIR spectroscopy
