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Using Silica Coated Nanoscale Zerovalent Particles for the Reduction of Chlorinated Ethylenes

  • Lenka Honetschlägerová
  • Petra Janouškovcová
  • Milica Velimirovic
  • Martin Kubal
  • Leen Bastiaens
Original Paper

Abstract

The impact of a silica coating on the degradation potential of nanoscale zerovalent iron (nZVI) particles toward a mixture of chlorinated ethylenes is presented. The newly employed stabilization method for nZVI, based on silica deposition from saturated sodium silicate water glass, produces nZVI particles with a similar reactivity as non-stabilized particles. Moreover the removal rate constant kM of trichloroethylene (0.1740 L g−1 d−1 Fe0) and cis-dichloroethylene (0.1045 L g−1 d−1Fe0) was significantly improved (almost by a factor of 2) for stabilized nZVI. X-ray photoelectron spectroscopy (XPS) and Wavelength Dispersive X-ray Fluorescence (WDXRF) analyzes revealed a high durability of silica coating and the coating left at least half of nZVI surface silica free for reaction for more than 5 weeks. The silica coating did not affect the surface composition of silica coated nZVI which was confirmed by the very similar distribution of degradation products and corrosion products (Fe3O4, FeOOH) as was found for non-coated nanoparticles. An enhanced reactivity supplemented with a stable corrosion properties indicates that silica coated nZVI has potential as an efficient remediation agent toward chlorinated ethylenes.

Keywords

Nanoscale Zerovalent Iron (nZVI) Silica coating Chlorinated ethylenes Degradation Groundwater remediation 

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Notes

Acknowledgements

This work was financially supported by the Technology Agency of the Czech Republic under grant TA02020654.

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© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Environmental ChemistryUniversity of Chemistry and Technology PraguePragueCzech Republic
  2. 2.Flemish Institute for Technological Research (VITO)MolBelgium
  3. 3.Department of Environmental GeosciencesUniversity of ViennaViennaAustria

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