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Magnetic Characterization and Interaction Modeling of Zerovalent Iron Nanoparticles for the Remediation of Contaminated Aquifers

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Abstract:

Nanoscale zerovalent iron (NZVI), promising for in situ degradation of many environmental contaminants, has been shown to aggregate reducing reactivity and mobility. Aggregation is attributed to the magnetic attractive forces between particles. In this study an alternating gradient force magnetometer (AGFM) is used to measure magnetic properties of NZVI. The magnetization curve is modeled according to the Langevin theory, evidencing a non-superparamagnetic nature of the particles. The measured ratio of remanent and saturation magnetization, 0.16, excludes the possibility of the dispersion being composed of Stoner-Wohlfarth (SW) type structures, probably due to the aggregated state of the particles at the measurement time. An extension of the Stoner-Wohlfarth model is therefore adopted to keep into account particle interaction and domain nucleation and found to be suitable for the system. Extended Derjaguin-Landau-Verwey-Overbeek (DLVO) model is applied to experimental data, under the hypothesis that primary particles behave according to the SW model, proving magnetic attraction to prevail on electrostatic repulsion.

Keywords: AGGREGATION; GROUNDWATER REMEDIATION; MAGNETIC CHARACTERIZATION; NANOSCALE ZEROVALENT IRON

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2009.047

Publication date: May 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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