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Nanopartículas de plata funcionalizadas permiten la eliminación eficiente de mercurio y la reducción de la toxicidad

Arianna Bellingeri1, Andrea Calantropio1, Iole Venditti2

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Las nanopartículas de plata (AgNPcitLcys) eliminan eficazmente el mercurio (Hg) del agua, mostrando baja ecotoxicidad para la vida acuática. Si bien son eficientes en ambientes marinos, la eliminación de Hg en agua dulce fue menos efectiva pero aún redujo la toxicidad.

Palabras clave:
Nanosilveraquatic speciesecotoxicitymercuryremoval

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Área de la Ciencia:

  • Ciencias Ambientales
  • Nanotecnología
  • Ecotoxicología

Sus antecedentes:

  • El mercurio (Hg) es un contaminante de metales pesados persistente, bioacumulativo y altamente tóxico.
  • La nanotecnología ofrece soluciones eficientes, rentables y reutilizables para la eliminación de metales pesados del agua.
  • Las nanopartículas de plata funcionalizadas con citrato y L-cisteína (AgNPcitLcys) están diseñadas para la eliminación de Hg con una ecotoxicidad mínima.

Objetivo del estudio:

  • Evaluar la eficacia de las AgNPcitLcys en la eliminación de Hg del agua.
  • Evaluar la ecotoxicidad de las AgNPcitLcys utilizando microalgas de agua dulce (Raphidocelis subcapitata) y marinas (Dunaliella tertiolecta).
  • Determinar la eficiencia de eliminación de Hg y la reducción de la toxicidad en diferentes medios acuáticos.

Principales métodos:

  • Síntesis y caracterización de nanopartículas de plata funcionalizadas con citrato y L-cisteína (AgNPcitLcys).
  • Exposición de Raphidocelis subcapitata y Dunaliella tertiolecta a AgNPcitLcys y agua contaminada con Hg.
  • Medición de los porcentajes de eliminación de Hg y evaluación de la inhibición del crecimiento de microalgas.

Principales resultados:

  • Las AgNPcitLcys exhibieron baja ecotoxicidad tanto para las especies de microalgas, con 10 mg/L causando el 40% de inhibición del crecimiento en D. tertiolecta.
  • La eficiencia de eliminación de Hg fue significativamente mayor en agua de mar (99,26%) en comparación con agua dulce (63,07%).
  • Las AgNPcitLcys redujeron con éxito la toxicidad de Hg en agua de mar para D. tertiolecta, pero no en agua dulce.

Conclusiones:

  • Las AgNPcitLcys demuestran una alta eficiencia en la eliminación de Hg del agua de mar y muestran potencial para aplicaciones en el mundo real.
  • Las nanopartículas poseen baja ecotoxicidad, lo que las convierte en una herramienta prometedora para mitigar la contaminación por mercurio.
  • Se necesita más investigación para optimizar la eliminación de Hg en sistemas de agua dulce y comprender completamente los impactos ecotoxicológicos a largo plazo.