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Nikolay A Bezhin1,2, Iuliia G Shibetskaia1, Ol'ga N Kozlovskaia1

  • 1Department of Biogeochemistry, Marine Hydrophysical Institute, Russian Academy of Sciences (MHI RAS), Kapitanskaya Str., 2, 299011 Sevastopol, Russia.

Materials (Basel, Switzerland)
|June 10, 2023
PubMed
Summary

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Manganese dioxide sorbents effectively recover beryllium-7 (7Be) from seawater. Modix and MDM sorbents demonstrated high efficiency in laboratory and expeditionary studies for oceanological applications.

Area of Science:

  • Environmental Chemistry
  • Marine Geochemistry
  • Radiochemistry

Background:

  • Beryllium-7 (7Be) is a cosmogenic radionuclide found in seawater.
  • Accurate measurement of 7Be is crucial for oceanographic studies.
  • Developing efficient sorbents for 7Be recovery from large seawater volumes is essential.

Purpose of the Study:

  • To comprehensively evaluate manganese dioxide-based sorbents for 7Be recovery from seawater.
  • To compare the efficiency of various sorbents under laboratory and expeditionary conditions.
  • To assess the performance of Modix, MDM, DMM, PAN-MnO2, and phosphorus(V) oxide (PD) sorbents.

Main Methods:

  • Sorption experiments under static and dynamic conditions.
  • Determination of distribution coefficients (Kd), dynamic, and total dynamic exchange capacities.
Keywords:
7Beberylliumiron(III) hydroxidemanganese dioxideseawatersorbents

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  • Kinetic and isotherm modeling (intraparticle diffusion, pseudo-orders, Elovich, Langmuir, Freindlich, Dubinin-Radushkevich).
  • Expeditionary studies on Black Sea water samples.

    • Main Results:

    • Modix (Kd = (2.2 ± 0.1) × 103 mL/g) and MDM (Kd = (2.4 ± 0.2) × 103 mL/g) sorbents showed high 7Be recovery efficiency.
    • Established dependences of recovery degree on time (kinetics) and capacity on equilibrium concentration (isotherm).
    • Demonstrated effective 7Be sorption from large volumes of Black Sea water during expeditionary studies.

    Conclusions:

    • Manganese dioxide-based sorbents, particularly Modix and MDM, are highly effective for 7Be recovery from seawater.
    • The study provides valuable data for optimizing 7Be measurement in oceanological research.
    • Compared favorably with aluminum oxide and iron(III) hydroxide sorbents.