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Journal of Nanoparticle Research

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01.10.2011 | Research Paper

Enhanced reactivity of nanoscale iron particles through a vacuum annealing process

verfasst von: Olga Riba, Robert J. Barnes, Thomas B. Scott, Murray N. Gardner, Simon A. Jackman, Ian P. Thompson

Erschienen in: Journal of Nanoparticle Research | Ausgabe 10/2011

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Abstract

A reactivity study was undertaken to compare and assess the rate of dechlorination of chlorinated aliphatic hydrocarbons (CAHs) by annealed and non-annealed nanoscale iron particles. The current study aims to resolve the uncertainties in recently published work studying the effect of the annealing process on the reduction capability of nanoscale Fe particles. Comparison of the normalized rate constants (m²/h/L) obtained for dechlorination reactions of trichloroethene (TCE) and cis-1,2-dichloroethene (cis-1,2-DCE) indicated that annealing nanoscale Fe particles increases their reactivity ~30-fold. An electron transfer reaction mechanism for both types of nanoscale particles was found to be responsible for CAH dechlorination, rather than a reduction reaction by activated H₂ on the particle surface (i.e., hydrogenation, hydrogenolysis). Surface analysis of the particulate material using X-ray diffraction (XRD) and transmission electron microscopy (TEM) together with surface area measurement by Brunauer, Emmett, Teller (BET) indicate that the vacuum annealing process decreases the surface area and increases crystallinity. BET surface area analysis recorded a decrease in nanoscale Fe particle surface area from 19.0 to 4.8 m²/g and crystallite dimensions inside the particle increased from 8.7 to 18.2 nm as a result of annealing.

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Titel: Enhanced reactivity of nanoscale iron particles through a vacuum annealing process
verfasst von: Olga Riba
Robert J. Barnes
Thomas B. Scott
Murray N. Gardner
Simon A. Jackman
Ian P. Thompson
Publikationsdatum: 01.10.2011
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 10/2011
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-011-0421-0

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