A method for the preparation of stable dispersion of zero-valent iron nanoparticles

Yuan Pang Sun, Xiao Qin Li, Wei Xian Zhang, H. Paul Wang

Research output: Contribution to journalArticlepeer-review

314 Citations (Scopus)

Abstract

Reported herein is a method for the synthesis of fully dispersed and reactive nanoscale particles of zero-valent iron. Polyvinyl alcohol-co-vinyl acetate-co-itaconic acid (PV3A), a nontoxic and biodegradable surfactant, is used in the synthesis of the nanoscale zero-valent iron (nZVI). The addition of PV3A effects three key surface-related changes, which lead to significant enhancements in surface chemistry, particle stability and subsurface mobility potential. These include (1) a reduction of the mean nZVI particle size from 105 nm to 15 nm, (2) a reduction of the zeta (ζ)-potential from +20 mV to -80 mV at neutral pH, and (3) a shift of the isoelectric point (IEP) from pH ≅ 8.1 to 4.5. X-ray photoelectron spectroscopy (XPS) indicates the sorption of PV3A on the nanoparticle surface and also the existence of zero-valent iron (Fe0) in the nZVI mass. Batch experiments further confirm that the PV3A-stabilized iron nanoparticles are capable of effectively reducing trichloroethene (TCE), as has been observed with previous nZVI materials. No sedimentation of the PV3A stabilized nZVI has been observed for over 6 months, suggesting the formation of stable nZVI dispersion. The appreciably smaller mean particle sizes and ability to remain in suspension should translate into improved subsurface mobility potential.

Original languageEnglish
Pages (from-to)60-66
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume308
Issue number1-3
DOIs
Publication statusPublished - 2007 Oct 31

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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