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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Precipitation and Co-precipitation01:17

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Radionuclides' Recovery from Seawater Using FIC and FIC A Sorbents.

Nikolay A Bezhin1,2, Vitaliy V Milyutin3, Natalia V Kuzmenkova4,5

  • 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

New sorbents based on modified activated carbon effectively recover trace radionuclides like cesium, beryllium, and phosphorus from seawater. This advancement aids radioecological and oceanological studies by enabling accurate natural radionuclide activity measurements.

Keywords:
FICdynamicsisothermkineticsradionuclidesseawatersorption

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Area of Science:

  • Environmental Chemistry
  • Radiochemistry
  • Oceanography

Background:

  • Accurate measurement of natural radionuclide activity in seawater is crucial for radioecological and oceanological research.
  • Existing methods face challenges in efficiently isolating and quantifying trace radionuclides.

Purpose of the Study:

  • To develop and evaluate novel sorbent materials for radionuclide recovery from seawater.
  • To investigate the sorption characteristics and efficiency of modified activated carbon sorbents.

Main Methods:

  • Synthesis of activated carbon sorbents modified with iron(III) ferrocyanide (FIC) and iron(III) hydroxide (FIC A).
  • Laboratory studies on radionuclide recovery, including determination of distribution coefficients and sorption isotherms (Langmuir, Freundlich, Dubinin-Radushkevich).
  • Kinetic modeling (pseudo-first/second-order, intraparticle diffusion, Elovich) and field assessments using single- and two-column methods.

Main Results:

  • FIC and FIC A sorbents demonstrated high efficiency in recovering trace radionuclides (137Cs, 7Be, 32P, 33P, 210Pb, 234Th) from large seawater volumes.
  • Sorption processes were well-described by established isotherm and kinetic models.
  • Successful application of sorbents under expeditionary conditions was confirmed.

Conclusions:

  • Modified activated carbon sorbents (FIC and FIC A) are effective for isolating and quantifying natural radionuclides in seawater.
  • These sorbents offer a promising solution for radioecological and oceanological monitoring and research.