Synthesis and investigation of composite sorbents based on mixed K-Co and K-Cu ferrocyanides for cesium extraction from aqueous media

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Abstract

A new method of creating composite sorption materials based on mixed K-Co and K-Cu ferrocyanides using polyethylene is proposed. The uniqueness of this method lies in the hydrophobisation of the material by integrating polyethylene fibres into the ferrocyanide structure. The surface morphology and structure of the obtained sorbents were investigated by scanning electron microscopy, X-ray phase analysis and low-temperature nitrogen adsorption. The peculiarities of extraction of micro- and macro concentrations of Cs+ cations and 137Cs radionuclide from sea water under static conditions were studied. The approximation of experimental sorption data using the Langmuir and Freundlich equations has been carried out, and the values of limiting sorption Gmax and adsorption equilibrium constant Kl have been calculated. It is demonstrated that the sorbents synthesised with the addition of polyethylene have the best sorption characteristics, achieving up to 99% purification of seawater from caesium ions. The average distribution coefficient of caesium in seawater is 3.8×10^4 ml/g at a solid-to-liquid phase ratio of 1000 ml/g, which indicates the prospects of their application for purification of seawater from radiocaesium.

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About the authors

А. N. Drankov

Far Eastern Federal University

Author for correspondence.
Email: artur.drankov@gmail.com
Russian Federation, Vladivostok

V. A. Balybina

Far Eastern Federal University

Email: artur.drankov@gmail.com
Russian Federation, Vladivostok

A. M. Zarubobo

The Joint Institute for Power and Nuclear Research–Sosny of the National Academy of Sciences of Belarus

Email: artur.drankov@gmail.com
Belarus, Minsk

V. V. Milutin

Institute of Physical Chemistry and Electrochemistry A.A. Frumkin, Russian Academy of Sciences

Email: artur.drankov@gmail.com
Russian Federation, Moscow

A. O. Lembikov

Far Eastern Federal University

Email: artur.drankov@gmail.com
Russian Federation, Vladivostok

S. M. Pisarev

Far Eastern Federal University

Email: artur.drankov@gmail.com
Russian Federation, Vladivostok

E. A. Ponomareva

Far Eastern Federal University

Email: artur.drankov@gmail.com
Russian Federation, Vladivostok

N. Y. Savelyev

Far Eastern Federal University

Email: artur.drankov@gmail.com
Russian Federation, Vladivostok

N. G. Kokorina

Far Eastern Federal University

Email: artur.drankov@gmail.com
Russian Federation, Vladivostok

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Supplementary files

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2. Fig. 1. X-ray diffraction patterns of FC K-Cu and FC K-Co, the composition of the samples is presented in Table 3.

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3. Fig. 2. Crystal structure of PC K-Co (a) and PC K-Cu (b) with marked Miller planes in Vesta software [25].

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4. Fig. 3. SEM images of the surface of mixed ferrocyanides: a – PC K-Co-PE with the addition of polyethylene, b – PC K-Cu-PE with the addition of polyethylene.

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5. Fig. 4. Low-temperature nitrogen sorption–desorption isotherms and histograms of pore size distribution calculated by the DFT method for PC K-Co-PE (a) and PC K-Cu-PE (b).

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6. Fig. 5. Isotherms of 133Cs sorption from distilled water solutions: a – FC K-Co-Pe, b – FC K-Cu-Pe; approximation of experimental values ​​(1), using the Freundlich equation (2).

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