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Influence of synthesis parameters on iron nanoparticle size and zeta potential

  • Nikki Goldstein
  • Lauren F. GreenleeEmail author
Research Paper

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.

Keywords

Nanoparticles Zero valent iron Particle size distribution Stabilizer Organophosphate Carboxymethyl cellulose Water treatment Environmental effects 

Notes

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.

Supplementary material

11051_2012_760_MOESM1_ESM.doc (740 kb)
Supplementary material 1 (DOC 740 kb)

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Copyright information

© Springer Science+Business Media B.V. (outside the USA) 2012

Authors and Affiliations

  1. 1.Materials Reliability DivisionNational Institute of Standards and TechnologyBoulderUSA

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