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Using graphene quantum dots for treating radioactive liquid waste.

Frederico Duarte de Menezes1, Luciana Magalhães Rebelo Alencar2, Clenilton Costa Dos Santos2

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Graphene quantum dots (GQDs) effectively adsorb uranium from radioactive waste. This green-synthesized nanomaterial offers significant volume reduction for safer storage and disposal.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Nanotechnology

Background:

  • Smart materials, particularly carbon-based nanomaterials, are gaining prominence due to their unique properties.
  • Graphene quantum dots (GQDs) exhibit remarkable adsorption capabilities, attributed to their large surface area and negatively charged functional groups.

Purpose of the Study:

  • To develop and evaluate graphene quantum dots (GQDs) as efficient nano-adsorbents for uranium (238U) removal from radioactive industrial waste.
  • To assess the potential of GQDs in reducing the volume of radioactive waste for improved storage and disposal.

Main Methods:

  • Graphene quantum dots (GQDs) were synthesized using an environmentally friendly (green) method.
  • The synthesized GQDs, sized between 160-220 nm, were tested for their uranium adsorption capacity in an alamine 3366 solution.

Main Results:

  • The developed GQDs demonstrated the ability to adsorb approximately 40% of uranium (238U) from the tested solution.
  • Treatment of radioactive waste with GQDs resulted in a significant volume reduction of nearly 90%.

Conclusions:

  • Graphene quantum dots (GQDs) show promise as smart nano-adsorbents for treating radioactive waste, offering an effective alternative to conventional absorbents.
  • The substantial volume reduction achieved using GQDs facilitates the storage and final disposal of radioactive materials.