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In situ XANES Study of Co2+ Ion Adsorption on Fe3O4 Nanoparticles in Supercritical Aqueous Fluids

Published online by Cambridge University Press:  07 February 2012

Hao Yan ,
Robert A. Mayanovic ,
Joseph Demster  and
Alan J. Anderson
Hao Yan
Affiliation:
Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO 65897, USA
Robert A. Mayanovic
Affiliation:
Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO 65897, USA
Joseph Demster
Affiliation:
Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO 65897, USA
Alan J. Anderson
Affiliation:
Department of Earth Sciences, St. Francis Xavier University, P.O. Box 5000, Antigonish, Nova Scotia, B2G 2W5, Canada
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Abstract

In situ x-ray absorption spectroscopy (XAS) measurements were made on Fe3O4 nanoparticles in supercritical aqueous fluids to 500 °C in order to study their reactivity with Co2+ aqua ions and to investigate the structural properties of the reacted nanoparticles. The analyses of the x-ray absorption near edge structure (XANES) of XAS indicate that reactivity of Fe3O4 nanoparticles with Co2+ ions is minimal to 200 °C but becomes significant in the 250–500 °C temperature range. XANES and angular momentum projected density of states (l-DOS) calculations were carried out using the FEFF8.2 code and analyses were made using multi-peak fitting to determine the origin of the features exhibited in the spectra.

Keywords

nanoscale hydrothermal extended x-ray absorption fine structure(EXAFS)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1383: Symposium A – Material Challenges in Current and Future Nuclear Technologies , 2012 , mrsf11-1383-a07-10
Copyright
Copyright © Materials Research Society 2012

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In situ XANES Study of Co2+ Ion Adsorption on Fe3O4 Nanoparticles in Supercritical Aqueous Fluids
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