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Sorption of Eu(III) on Fe–montmorillonite relevant to geological disposal of HLW

  • Santosh Chikkamath , Madhuri A. Patel , Aishwarya S. Kar EMAIL logo , Vaibhavi Raut , Bhupendra Singh Tomar and Jayappa Manjanna EMAIL logo
Published/Copyright: August 30, 2018
Radiochimica Acta
From the journal Radiochimica Acta Volume 106 Issue 12

Abstract

Montmorillonite (Mt) is the major clay mineral of bentonite, which is the candidate buffer material in the engineered barrier system for geological disposal of high level waste (HLW). The alteration of Mt due to its interaction with carbon steel (overpack) can produce Fe–Mt. In order to understand the basic properties of Fe–Mt, the sorption studies using Eu(III) are reported here. For this, Fe(III)–Mt was prepared by conventional cation exchange method using FeCl3 with Na–Mt. The obtained Fe(III)–Mt was then reduced to Fe(II)–Mt using ascorbic acid. Both the samples were characterized based on their X-ray diffraction, Fourier transform infrared spectra, cation exchange capacity and specific surface area. The batch sorption studies of Eu(III) were conducted for both Fe(III)–Mt and Fe(II)–Mt as a function of pH (3–10), ionic strength (0.001 M–1 M) and Eu(III) concentration (10−8–10−3 M). The distribution coefficient (Kd) was found to be higher for Fe(III)–Mt compared to Fe(II)–Mt and Na–Mt. The sudden increase in sorption in the pH range 4.5–6 and remaining constant beyond it indicates ion exchange mechanism at pH<4.5, with surface complexation mechanism dominating the sorption at pH>4.5. This is further corroborated by ionic strength dependent sorption data which shows decrease in sorption capacity of Fe–Mt with increasing ionic strength at low pH, but remaining more or less unchanged at higher pH. Eu(III) adsorption isotherm on Fe–Mt increased linearly with [Eu(III)] reaching saturation at 10−5 M and 10−4 M for Fe(III)–Mt and Fe(II)–Mt, respectively. The amount of iron released from Fe–Mt and Fe(II)/Fetotal during sorption were estimated to understand the effect on Eu(III) sorption behaviour by release of interlayer iron in Fe–Mt.

Keywords: Clay alteration; Fe(III)–montmorillonite; Fe(II)–montmorillonite; sorption; Eu(III)
Corresponding authors: Dr. Aishwarya S. Kar, Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India; and Dr. Jayappa Manjanna, Department of Chemistry, Rani Channamma University, Belagavi 591 156, India, Tel.: +91 99 1658 4954

Acknowledgments

Financial support from the Board of Research in Nuclear Sciences (BRNS), Dept. of Atomic Energy (DAE), Govt. of India, is greatly acknowledged.

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Received: 2018-02-20
Accepted: 2018-07-12
Published Online: 2018-08-30
Published in Print: 2018-11-27

©2018 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Online chemical adsorption studies of Hg, Tl, and Pb on SiO2 and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA
  3. Thermodynamic parameters for the complexation of technetium(IV) with EDTA
  4. Sorption of Eu(III) on Fe–montmorillonite relevant to geological disposal of HLW
  5. Study of the redistribution of U, Zr, Nb, Tc, Mo, Ru, Fe, Cr, and Ni between oxide and metallic phases in the matrix of a multiphase Chernobyl hot-particle extracted from a soil sample of the Western Plume
  6. 99Mo/99mTc radioisotope generator based on adsorption of 99Mo (VI) on cerium (IV) molybdate column matrix
  7. Radioiodination and biological evaluation of landiolol as a tracer for myocardial perfusion imaging: preclinical evaluation and diagnostic nuclear imaging
  8. Study on gamma ray shielding performance of concretes doped with natural sepiolite mineral
  9. Neural network prediction of K and L-shell X-ray production cross sections
https://doi.org/10.1515/ract-2018-2947
Keywords for this article
Clay alteration; Fe(III)–montmorillonite; Fe(II)–montmorillonite; sorption; Eu(III)

Articles in the same Issue

  1. Frontmatter
  2. Online chemical adsorption studies of Hg, Tl, and Pb on SiO2 and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA
  3. Thermodynamic parameters for the complexation of technetium(IV) with EDTA
  4. Sorption of Eu(III) on Fe–montmorillonite relevant to geological disposal of HLW
  5. Study of the redistribution of U, Zr, Nb, Tc, Mo, Ru, Fe, Cr, and Ni between oxide and metallic phases in the matrix of a multiphase Chernobyl hot-particle extracted from a soil sample of the Western Plume
  6. 99Mo/99mTc radioisotope generator based on adsorption of 99Mo (VI) on cerium (IV) molybdate column matrix
  7. Radioiodination and biological evaluation of landiolol as a tracer for myocardial perfusion imaging: preclinical evaluation and diagnostic nuclear imaging
  8. Study on gamma ray shielding performance of concretes doped with natural sepiolite mineral
  9. Neural network prediction of K and L-shell X-ray production cross sections
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