7Be Recovery from Seawater by Sorbents of Various Types

Nikolay A Bezhin; Iuliia G Shibetskaia; Ol'ga N Kozlovskaia; Evgeniy V Slizchenko; Ivan G Tananaev

doi:10.3390/ma16114088

⁷Be Recovery from Seawater by Sorbents of Various Types

Materials (Basel). 2023 May 31;16(11):4088. doi: 10.3390/ma16114088.

Authors

Nikolay A Bezhin^{1

2}, Iuliia G Shibetskaia¹, Ol'ga N Kozlovskaia¹, Evgeniy V Slizchenko¹, Ivan G Tananaev^{2

3

4}

Affiliations

¹ Department of Biogeochemistry, Marine Hydrophysical Institute, Russian Academy of Sciences (MHI RAS), Kapitanskaya Str., 2, 299011 Sevastopol, Russia.
² Department of Chemistry and Chemical Engineering, Sevastopol State University, Universitetskaya Str., 33, 299053 Sevastopol, Russia.
³ Radiochemistry Laboratory, Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences (GEOKHI RAS), Kosygin Str., 19, 119991 Moscow, Russia.
⁴ Department of Nuclear Technology, Far Eastern Federal University, Sukhanov Str., 8, 690091 Vladivostok, Russia.

Abstract

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 (K_d = (2.2 ± 0.1) × 10³ mL/g) and MDM (K_d = (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.

Keywords: 7Be; beryllium; iron(III) hydroxide; manganese dioxide; seawater; sorbents.

Abstract

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