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Influence of synthesis parameters on iron nanoparticle size and zeta potential

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Abstract

Zero valent iron nanoparticles are of increasing interest in clean water treatment applications due to their reactivity toward organic contaminants and their potential to degrade a variety of compounds. This study focuses on the effect of organophosphate stabilizers on nanoparticle characteristics, including particle size distribution and zeta potential, when the stabilizer is present during nanoparticle synthesis. Particle size distributions from DLS were obtained as a function of stabilizer type and iron precursor (FeSO4·7H2O or FeCl3), and nanoparticles from 2 to 200 nm were produced. Three different organophosphate stabilizer compounds were compared in their ability to control nanoparticle size, and the size distributions obtained for particle volume demonstrated differences caused by the three stabilizers. A range of stabilizer-to-iron (0.05–0.9) and borohydride-to-iron (0.5–8) molar ratios were tested to determine the effect of concentration on nanoparticle size distribution and zeta potential. The combination of ferrous sulfate and ATMP or DTPMP phosphonate stabilizer produced stabilized nanoparticle suspensions, and the stabilizers tested resulted in varying particle size distributions. In general, higher stabilizer concentrations resulted in smaller nanoparticles, and excess borohydride did not decrease nanoparticle size. Zeta potential measurements were largely consistent with particle size distribution data and indicated the stability of the suspensions. Probe sonication, as a nanoparticle resuspension method, was minimally successful in several different organic solvents.

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Acknowledgments

The authors acknowledge Roy H. Geiss for obtaining TEM images (Online resource 1). LF Greenlee acknowledges the National Research Council and NIST for a postdoctoral fellowship.

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Correspondence to Lauren F. Greenlee.

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Contribution of NIST, an agency of the US government; not subject to copyright in the United States.

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Goldstein, N., Greenlee, L.F. Influence of synthesis parameters on iron nanoparticle size and zeta potential. J Nanopart Res 14, 760 (2012). https://doi.org/10.1007/s11051-012-0760-5

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