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Surface Interactions between Gold Nanoparticles and Biochar.

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Engineered gold nanoparticles (nAu) bind strongly to biochar, a soil amendment. This interaction is crucial for understanding how nanomaterials behave in agricultural soils.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Soil Science

Background:

  • Engineered nanomaterials are increasingly used in agriculture via pesticide/fertilizer formulations and soil amendments.
  • The environmental fate of engineered nanomaterials, particularly their interaction with soil components like biochar, is not well understood.

Purpose of the Study:

  • To investigate the surface interactions and retention mechanisms of citrate-capped gold nanoparticles (nAu) on biochar derived from pecan shells.
  • To determine how biochar properties, such as pyrolysis temperature and pH, influence nAu retention.

Main Methods:

  • Transmission Electron Microscopy (TEM) to observe the organic layer on nAu and its interaction with biochar.
  • Experiments to quantify nAu retention on biochars and sandy loam soil under varying ionic strength and pH conditions.
  • Analysis of nAu retention as a function of biochar pyrolysis temperature (300-700°C).

Main Results:

  • Rapid and irreversible retention of citrate-capped nAu on biochars occurred, even at neutral pH.
  • The organic citrate layer on nAu remained intact after binding to biochar.
  • nAu retention was significantly higher on biochars compared to sandy loam soil.
  • Retention was dependent on ionic strength, pH, and biochar pyrolysis temperature, with 300°C biochar showing strong hydrogen bonding and 700°C biochar involving charge transfer.

Conclusions:

  • Biochar plays a significant role in the environmental fate of engineered nanomaterials in soil.
  • The interaction mechanisms between nAu and biochar vary with biochar properties, influenced by factors like carboxyl enrichment and polyaromatic structures.
  • Surface area-normalized retention of nAu on biochar is substantially higher than on other environmental surfaces, highlighting biochar's importance in nanomaterial sequestration.