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An approach for the efficient immobilization of 79Se using Fe-OOH modified GMZ bentonite

  • Junqiang Yang , Keliang Shi EMAIL logo , Xuejie Sun , Xiaoqing Gao , Peng Zhang , Zhiwei Niu and Wangsuo Wu EMAIL logo
Published/Copyright: June 27, 2019
Radiochimica Acta
From the journal Radiochimica Acta Volume 108 Issue 2

Abstract

Because of high mobility, the immobilization of long-lived fission product 79Se (often existed as 79Se(IV) and 79Se(VI) anions) is a critical consideration in the repository of high-level radioactive waste. In this work, a Fe-OOH modified bentonite (Fe-OOH-bent) was synthesized as a potential filling material in the repository site for effective adsorption and present the migration of different species of 79Se. The adsorbent was characterized using FT-IR, XRD, XFS, zeta potential and BET to clarify its physical properties, compositions and structures. A good thermal and radiation stabilities of Fe-OOH-bent was confirmed by its stable uptake ratio for Se(IV) and Se(VI) compared to original samples. The batch experimental results show that Se(IV) and Se(VI) can be efficiently removed from aqueous by Fe-OOH-bent within 60 min with maximum adsorption capacities of 68.45 mg/g for Se(IV) and 40.47 mg/g for Se(VI) in the optimal conditions, indicating its high potential application in consideration of its simple synthesis process, low cost and high adsorption capacity in view of immobilization of 79Se. The surface species and variation of oxide state of Fe as well as Se(IV) and Se(VI) onto Fe-OOH-bent were investigated by XPS analysis. The values of relative area of Se(IV)–O and Se(VI)–O in XPS spectra followed the same tendency as their adsorption ratio with the variation of system pH, suggesting that the formation of complexes between selenium species and Fe-OOH-bent surface.

Keywords: 79Se; Fe-OOH modified bentonite; adsorption; immobilization mechanism

Funding source: Science Challenging Program

Award Identifier / Grant number: TZ2016004

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 21771093

Funding statement: The financial support from Science Challenging Program (No. TZ2016004), National Natural Science Foundation of China (No. 21771093) and Fundamental Research Funds for the Central Universities of China (lzujbky-2017-it38) are gratefully appreciated.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/ract-2019-3151).

Received: 2019-04-08
Accepted: 2019-05-30
Published Online: 2019-06-27
Published in Print: 2020-01-28

© 2020 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

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  3. Determination of 210Po in low-level wild bilberries reference material for quality control assurance in environmental analysis using extraction chromatography and α-particle spectroscopy
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https://doi.org/10.1515/ract-2019-3151
Keywords for this article
79Se; Fe-OOH modified bentonite; adsorption; immobilization mechanism

Articles in the same Issue

  1. Frontmatter
  2. Development of methods for the preparation of radiopure 82Se sources for the SuperNEMO neutrinoless double-beta decay experiment
  3. Determination of 210Po in low-level wild bilberries reference material for quality control assurance in environmental analysis using extraction chromatography and α-particle spectroscopy
  4. Chemical effects of nuclear transformations and possible formation of unknown derivatives with N-phenylquinazolinium structure
  5. An approach for the efficient immobilization of 79Se using Fe-OOH modified GMZ bentonite
  6. Kinetics and mechanism of the advanced oxidation process of Cr(III) to Cr(VI) by SO4−˙ free radicals in slightly acidic simulated atmospheric water
  7. Preparation of novel nano composite materials from biomass waste and their sorptive characteristics for certain radionuclides
  8. Effect of maleic anhydride content on physico-mechanical properties of γ-irradiated waste polypropylene/corn husk fibers bio-composites
  9. Precise volume fraction measurement for three-phase flow meter using 137Cs gamma source and one detector
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