Radionuclides’ Recovery from Seawater Using FIC and FIC A Sorbents

Bezhin, N.A.; Milyutin, V.V.; Kuzmenkova, N.V.; Shibetskaia, I.G.; Kozlovskaia, O.N.; Slizchenko, E.V.; Razina, V.A.; Tananaev, I.G.

Авторы: Bezhin Nikolay A., Milyutin Vitaliy V., Kuzmenkova Natalia V., Shibetskaia Iuliia G., Kozlovskaia Ol’ga N., Slizchenko Evgeniy V., Razina Victoria A., Tananaev Ivan G.
Журнал: Materials
Том: 16
Номер: 11
Год издания: 2023
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 4181
DOI: 10.3390/ma16114181
Аннотация: To solve radioecological and oceanological problems (estimate the vertical transport, flows of particulate organic carbon, phosphorus biodynamics, submarine groundwater discharge, etc.), it is necessary to determine the natural values of the radionuclides’ activity in seawater and particulate matter. For the first time, the radionuclides’ sorption from seawater was studied using sorbents based on activated carbon modified with iron(III) ferrocyanide (FIC) and based on activated carbon modified with iron(III) hydroxide (FIC A—activated FIC) obtained by FIC sorbent treatment with sodium hydroxide solution. The possibility of trace amounts of phosphorus, beryllium, and cesium recovery in laboratory conditions has been investigated. Distribution coefficients, dynamic, and total dynamic exchange capacities were determined. The physicochemical regularities (isotherm and kinetics) of sorption have been studied. The results obtained are characterized via Langmuir, Freindlich, and Dubinin–Radushkevich isotherm equations, as well as pseudo-first and pseudo-second-order kinetic models, intraparticle diffusion, and the Elovich model. Under expeditionary conditions, the sorption efficiency of 137Cs using FIC sorbent, 7Be, 32P, and 33P—using FIC A sorbent with a single-column method by adding a stable tracer, as well as the sorption efficiency of radionuclides 210Pb and 234Th with their natural content by FIC A sorbent in a two-column mode from large volumes of seawater was assessed. High values of efficiency of their recovery by the studied sorbents were achieved.
Добавил в систему: Кузьменкова Наталья Викторовна

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