articleEnvironmental Science & TechnologyDec 1, 2006Closed access

Aggregation and Sedimentation of Aqueous Nanoscale Zerovalent Iron Dispersions

TPTanapon PhenratNBNavid B. SalehKSKevin SirkRDRobert D. TiltonGVGregory V. Lowry

Carnegie Mellon University

PubMed
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Abstract

Nanoscale zerovalent iron (NZVI) rapidly transforms many environmental contaminants to benign products and is a promising in-situ remediation agent. To be effective, NZVI should form stable dispersions in water such that it can be delivered in water-saturated porous media to the contaminated area. Limited mobility of NZVI has been reported, however, attributed to its rapid aggregation. This study uses dynamic light scattering to investigate the rapid aggregation of NZVI from single nanoparticles to micrometer size aggregates, and optical microscopy and sedimentation measurements to estimate the size of interconnected fractal aggregates formed. The rate of aggregation increased with increasing particle…

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Topics & keywords

Topics
Keywords
  • Zerovalent iron
  • Particle aggregation
  • DLVO theory
  • Diffusion-limited aggregation
  • Hematite
  • Magnetite
  • Particle size
  • Dynamic light scattering
UN Sustainable Development Goals
  • Clean water and sanitation
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