A study of groundwater matrix effects for the destruction of trichloroethylene using fe/Pd nanoaggregates

D. E. Meyer, S. Hampson, L. Ormsbee, D. Bhattacharyya

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Iron nanoaggregates have been prepared using the sodium borohydride reduction method and post-coated with Pd using aqueous phase electro-deposition. The Fe/Pd nanoaggregates were used to examine dechlorination of trichloroethylene (TCE) with regard to matrix effects using materials representative of a potential zero-valent metal remediation site surrounding the Paducah gaseous diffusion plant in Paducah, KY. A surface-area-normalized first-order rate constant of 1.4 X 10-1 Lm-2 h -1 was obtained for the case of ideal dechlorination of 19.6 mg L-1 TCE at room temperature and pH 6.2 using 0.5 g L-1 Fe/Pd (0.42 wt % Pd) loading. This value decreases by an order of magnitude to 1.9 X 10-2 l-2 b-1 when the reaction is carried out in a realistic background matrix when the pH is high (8.8). For all variables tested, Pd content has the most impact on reaction rates. Circulating batch-column experiments are used to study dechlorination under flow conditions and demonstrate the ability of nonstabilized Fe/Pd nanoaggregates to remove significant amounts of TCE (80-90%) over a broad range of groundwater velocities (12.9-83 ft per day) using moderate metal loadings (0.23-0.5 g L-1).

Original languageEnglish
Pages (from-to)507-518
Number of pages12
JournalEnvironmental Progress and Sustainable Energy
Volume28
Issue number4
DOIs
StatePublished - Dec 2009

Keywords

  • Circulated-column
  • Fe/Pd nanoaggregates
  • Matrix effect
  • Remediation
  • TCE

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemical Engineering (all)
  • Renewable Energy, Sustainability and the Environment
  • Water Science and Technology
  • Waste Management and Disposal
  • Environmental Science (all)

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