Surface-functionalized magnetic nanoparticles are promising adsorbents due to their large specific surface areas, tunable surface chemistries, and ease of separation after contaminant removal. We have quantified the equilibrium adsorption behavior and developed surface complexation models that can be used to interpret and predict metal adsorption as a function of the water chemistry. The first system explored is the adsorption of U(VI) to iron oxide nanoparticles with bilayer structures that have outward facing functional groups present in stearic acid, oleic acid and octadecylphosphonic acid. The second system studied extended the investigation of U(VI) adsorption to iron oxide nanoparticles with coatings composed of a natural rhamnolipid biosurfactants. The final set of experiments to be presented is an investigation of adsorption of Cr(VI), present as anionic CrO42- and HCrO4- species, to nanoparticles with a bilayer structure with the net positive (cationic) head group in trimethyloctadecylammonium bromide.

Impact of water chemistry on metal adsorption to surface-functionalized iron oxide nanoparticles

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.