Accelerated generation of free radicals by iron oxide nanoparticles in the presence of an alternating magnetic field

Robert J. Wydra, Catherine E. Oliver, Kimberly W. Anderson, Thomas D. Dziubla, J. Zach Hilt

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

The surfaces of iron oxide nanoparticles are capable of catalytically generating reactive oxygen species (ROS) through the Fenton and Haber-Weiss reactions. Fenton chemistry has been shown to be temperature dependent with an increase in activity up to 40 °C and then a decrease above this temperature as the hydrogen peroxide degrades into oxygen and water which limits the reaction. When exposed to an alternating magnetic field (AMF), iron oxide nanoparticles absorb the energy from the magnetic field and convert it into heat. In this study, we observed an increase in the degradation of methylene blue when a suspension of magnetite nanoparticles (Fe3O4) was exposed to an AMF indicating there was an increase in the ROS generation in response to the AMF. The increase in ROS generation compared to the Arrhenius prediction was both time and concentration dependent; in which we observed a decrease in ROS enhancement with increased time of exposure and concentration. We postulate that the decrease is due to agglomeration in the presence of the field. As the nanoparticles agglomerate, there is a decrease in surface area per mass limiting the reaction rate.

Original languageEnglish
Pages (from-to)18888-18893
Number of pages6
JournalRSC Advances
Volume5
Issue number24
DOIs
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2015.

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)

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