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Method for Modification of Vermiculite with Copper Ferrocyanide for Selective Extraction of 137Cs from Liquid-salt Media

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Abstract

Composite materials have been obtained on the basis of vermiculite modified with copper ferrocyanide and the subsequent treatment with chitosan. Preliminarily, vermiculite was treated with hydrochloric acid and then cellulose, with the subsequent precipitation of all the salts that passed into solution with ammonia. Further, a sample was modified with copper ferrocyanide and then chitosan was deposited. The composition and properties of vermiculite samples were examined by energy-dispersive method of analysis, IR spectroscopy, positron-annihilation spectroscopy (PAS), diffraction analysis and also by means of nitrogen adsorption at low temperature a and adsorption of Methylene Blue. The specific surface area and the internal volume were found for the samples crushed in accordance with the modification stage. The PAS data were used to calculate the specific volumes of positron and positronium annihilations, which were correlated with the data on the low-temperature adsorption of nitrogen. Model solutions were used to examine the sorption properties of the modified vermiculites for 137Cs in salt solutions. The sorption isotherms were used to calculate the ultimate sorption capacity of the materials. For samples modified with copper ferrocyanide and chitosan it reaches values of 260 and 660 mg/g, respectively.

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ACKNOWLEDGMENTS

The part of the study, concerned with the sorption characteristics of the sorbents synthesized, was carried out at the Collective Use Center at the Ozersk Technological Institute, Research Institute of Nuclear Reactors, Moscow Engineering Physics Institute by a staff member Fedorova O. V.

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Authors and Affiliations

  1. Far-Eastern Federal University, 690091, Vladivostok, Russia

    N. P. Shapkin, I. G. Khal’chenko, A. I. Matskevich & I. G. Tananaev

  2. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    I. G. Tananaev

  3. Ozersk Technological Institute, Research Institute of Nuclear Reactors, Moscow Engineering Physics Institute, Ozersk, 456783, Chelyabinsk oblast, Russia

    I. G. Tananaev

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  1. N. P. Shapkin
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  2. I. G. Khal’chenko
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  3. A. I. Matskevich
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  4. I. G. Tananaev
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Correspondence to N. P. Shapkin.

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Translated from Radiokhimiya, No. 3, pp. 268–275, April, 2021 https://doi.org/10.31857/S0033831121030097

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Shapkin, N.P., Khal’chenko, I.G., Matskevich, A.I. et al. Method for Modification of Vermiculite with Copper Ferrocyanide for Selective Extraction of 137Cs from Liquid-salt Media. Radiochemistry 63, 345–352 (2021). https://doi.org/10.1134/S1066362221030127

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  • DOI: https://doi.org/10.1134/S1066362221030127

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