An original method is presented of obtaining composite sorption materials based on mixed ferrocyanide Ni-K and Zn-K in a composition with a siloxane-acrylate emulsion and polyethylene. The originality of the method is in the material hydrophobization by introducing polyethylene fibres into the structure of ferrocyanides. The peculiarities of extracting the micro-and microconcentrations of Cs+ cations, as well as Cs-137 radionuclides from seawater under static and dynamic conditions have been studied. The experimental values of sorption are approximated according to the Freundlich, Langmuir, Langmuir-Freundlich equations, and the values of the maximum sorption Gmax and the adsorption equilibrium constants Kl are calculated. It has been determined that the sorbents synthesized with the use of polyethylene, when the degree of seawater purification from cesium ions is reached up to 99%, have the best sorption characteristics. The Kp values for cesium when using the studied sorbents can reach 105 ml/g, which indicates that they are promising for the seawater purification from radioactive cesium. The described approach is an example of a simple and available technological synthesis of effective and practically demanded sorbents of high operational quality. © 2021 Trans Tech Publications Ltd, Switzerland.

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