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Interaction Between Graphene Oxide Nanoparticles and Quartz Sand.

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|October 15, 2015
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Ionic strength significantly impacts graphene oxide (GO) nanoparticle attachment to quartz sand, increasing with higher ionic strength. Temperature and pH showed minimal influence on GO nanoparticle adsorption.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Nanotechnology

Background:

  • Graphene oxide (GO) nanoparticles are increasingly used in environmental applications.
  • Understanding GO nanoparticle interactions with geological media like quartz sand is crucial for risk assessment.
  • Surface properties and solution chemistry influence nanoparticle fate and transport.

Purpose of the Study:

  • To investigate the effects of pH, ionic strength (IS), and temperature on graphene oxide (GO) nanoparticle attachment to quartz sand.
  • To determine the dominant mechanisms governing GO nanoparticle-quartz sand interactions.
  • To evaluate the thermodynamic and kinetic aspects of GO nanoparticle adsorption.

Main Methods:

  • Batch experiments conducted under controlled temperature, pH, and ionic strength.
  • Electrophoretic mobility measurements to characterize surface properties of GO and quartz sand.
  • Derjaguin-Landau-Verwey-Overbeek (DLVO) potential energy calculations using zeta potentials.
  • Adsorption isotherm (Freundlich) and kinetic (pseudo-second-order) modeling.

Main Results:

  • GO nanoparticles exhibited high stability under tested conditions.
  • Ionic strength significantly enhanced GO nanoparticle attachment to quartz sand.
  • Temperature and pH had negligible effects on GO nanoparticle adsorption.
  • Adsorption followed Freundlich isotherm and pseudo-second-order kinetics, indicating surface heterogeneity and chemisorption.
  • Attachment process was nonspontaneous and endothermic.

Conclusions:

  • Ionic strength is the primary factor controlling GO nanoparticle attachment to quartz sand.
  • Chemisorption, driven by surface heterogeneity, governs GO retention.
  • Secondary minimum interactions are unlikely to be the dominant attachment mechanism.
  • Findings provide insights into the environmental behavior and fate of GO nanoparticles.