Effect of aging on the structure and reactivity of nanoparticles of iron/iron oxides

Vaishnavi Sarathy, James T. Nurmi, Paul G. Tratnyek, James E. Amonette, Donald R. Baer, Chan Lan Chun

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

A key characteristic of iron/iron oxide nanoparticles is that their core-shell structure evolves with exposure to environmental conditions, largely defining their fate and presumably altering their reactivity with other substances. Using nanoparticles with an Fe(0) core and predominantly magnetite shell, we have studied the structure and reactivity of these particles during short- and long-term diagenesis using microscopy, spectroscopy, electrochemical, and chemical probe methods. Chronopotentiometry shows depassivation shortly after immersion, suggesting breakdown of the oxide shell, which is consistent with a short-term increase in the rate of carbon tetrachloride reduction determined with batch experiments. Over longer time-periods (days), however, chronopotentiometry shows passivation is partially restored, XPS and XRD confirm the shell thickness increases, and carbon tetrachloride reduction rates decrease. The yield of chloroform from carbon tetrachloride reduction may increase slightly in the short-time regime, but then it declines and stabilizes, concurrent with regrowth of the magnetite-rich oxide film.

Original languageEnglish (US)
Title of host publication233rd ACS National Meeting, Abstracts of Scientific Papers
StatePublished - Dec 28 2007
Event233rd ACS National Meeting - Chicago, IL, United States
Duration: Mar 25 2007Mar 29 2007

Publication series

NameACS National Meeting Book of Abstracts
ISSN (Print)0065-7727

Other

Other233rd ACS National Meeting
CountryUnited States
CityChicago, IL
Period3/25/073/29/07

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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    Sarathy, V., Nurmi, J. T., Tratnyek, P. G., Amonette, J. E., Baer, D. R., & Chun, C. L. (2007). Effect of aging on the structure and reactivity of nanoparticles of iron/iron oxides. In 233rd ACS National Meeting, Abstracts of Scientific Papers (ACS National Meeting Book of Abstracts).