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Related Experiment Videos

In situ sorption of technetium using activated carbon

Holm1, Gafvert, Lindahl

  • 1Department of Radiation Physics, Lund University Hospital, Sweden. elis.holm@radfys.lu.se

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|July 6, 2000
PubMed
Summary

Activated carbon effectively removes technetium (Tc) from water, with optimal sorption at pH 2-4. This method allows rapid analysis of 99Tc in large water volumes using cartridge filters.

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Area of Science:

  • Environmental Chemistry
  • Radiochemistry
  • Materials Science

Background:

  • Technetium (Tc) is a radioactive element found in nuclear waste and environmental samples.
  • Efficient methods for technetium removal and analysis are crucial for environmental monitoring and remediation.
  • Pertechnetate (TcO4-) is the dominant mobile species of technetium in oxic aqueous environments.

Purpose of the Study:

  • Investigate the sorption of technetium (Tc) in pertechnetate form onto activated carbon.
  • Determine optimal conditions for technetium removal from aqueous solutions.
  • Evaluate the feasibility of using activated carbon filters for environmental water sampling and analysis of 99Tc.

Main Methods:

  • Sorption experiments were conducted using activated carbon with varying pH and grain sizes.

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  • Distribution coefficients (Kd) were measured to quantify sorption efficiency.
  • Kinetic studies were performed to determine equilibrium time.
  • Technetium removal from large volumes of environmental water was tested using impregnated cartridge filters.

    • Main Results:

    • Sorption is highly pH-dependent, with maximum distribution coefficients (Kd) of approximately 10^6 at pH 2-4.
    • Optimal sorption was observed with activated carbon grain size <= 100 micrometers.
    • Equilibrium was reached within approximately 5 hours at room temperature.
    • Activated carbon cartridge filters effectively sorbed technetium from large water volumes at a rate of 5 L/min.

    Conclusions:

    • Activated carbon is a highly effective sorbent for removing technetium from water, particularly in acidic conditions.
    • The reduction of Tc by activated carbon may be a significant sorption mechanism.
    • Impregnated activated carbon filters provide a practical method for concentrating and analyzing 99Tc from large environmental water samples.