Estimation of 137Cs Distribution and Recovery Using Various Types of Sorbents in the Black Sea Surface Layer

Bezhin, N. A.; Kremenchutskii, D. A.; Slizchenko, Evgeniy V.; Kozlovskaia, Ol’ga N.; Shibetskaia, Iuliia G.; Milyutin, V. V.; Тананаев, И. Г.

doi:10.3390/pr11020603

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…5-6 h later, when the concentration of beryllium was equalized in the entire volume of the container, the sample was passed through one column with the studied sorbent. In this case, every 10-50 L, a sample of the passed seawater was taken to analyze the concentration of stable beryllium in it for further evaluation of the sorption efficiency using the equation given in [22,23]:…”

Section: Sorption Of 7 Be From Large Volumes Of Seawatermentioning

confidence: 99%

7Be Recovery from Seawater by Sorbents of Various Types

et al. 2023

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For the first time, a comprehensive study of sorbents based on manganese dioxide was carried out for beryllium sorption from seawater in laboratory and expeditionary conditions. The possibility of using several commercially available sorbents based on manganese dioxide (Modix, MDM, DMM, PAN-MnO2) and phosphorus(V) oxide (PD) for 7Be recovery from seawater for solving oceanological problems was evaluated. Beryllium sorption under static and dynamic conditions was studied. The distribution coefficients and dynamic and total dynamic exchange capacities were determined. Sorbents Modix (Kd = (2.2 ± 0.1) × 103 mL/g) and MDM (Kd = (2.4 ± 0.2) × 103 mL/g) showed high efficiency. The dependences of the degree of recovery on time (kinetics) and the capacity of the sorbent on the beryllium equilibrium concentration in solution (isotherm) were established. The data obtained were processed using kinetic models (intraparticle diffusion, pseudo-first and pseudo-second orders, Elovich model) and sorption isotherm equations (Langmuir, Freindlich, Dubinin–Radushkevich). The paper contains results of expeditionary studies to evaluate the sorption efficiency of 7Be from large volumes of the Black Sea water by various sorbents. We also compared the sorption efficiency of 7Be for the considered sorbents with aluminum oxide and previously obtained sorbents based on iron(III) hydroxide.

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Section: Sorption Of 7 Be From Large Volumes Of Seawatermentioning

confidence: 99%

7Be Recovery from Seawater by Sorbents of Various Types

et al. 2023

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“…The sorption efficiency of 7 Be, 32 P, 33 P, and 137 Cs from seawater was determined by the equations given in refs. [36,53].…”

Section: Evaluation Of the Sorption Efficiencymentioning

confidence: 99%

“…It is clear that FIC sorbent effectively extracts 137 Cs from large volumes of seawater at transmission rates of 1.5-4 C.V./min (E = 60-86.1%). Thus, in expeditionary research, the FIC sorbent is more efficient than the Anfezh sorbent and extracts 137 Cs in a way that is on par with the Uniket sorbent [53].…”

Section: Sorption Efficiencymentioning

confidence: 99%

Radionuclides’ Recovery from Seawater Using FIC and FIC A Sorbents

Bezhin,

Milyutin,

Kuzmenkova

et al. 2023

Materials

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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.

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