Effect of the structural change of an iron-iron oxide mixture on the decomposition of trichloroethylene

Shiro Kubuki, Koya Shibano, Kazuhiko Akiyama, Zoltán Homonnay, Erno Kuzmann, Mira Ristić, Tetsuaki Nishida

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The effect of the structure of a mixture of industrially produced iron and iron oxide on the decomposition of trichloroethylene (TCE) was investigated by gas chromatography, scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray analysis, X-ray diffractometry, and 57Fe-Mössbauer spectroscopy. The concentration of 10 mg L -1 TCE aqueous solution decreased to 0.41, 0.52, 0.26, and 0.09 mg L-1 when stirred for 7 days with iron-iron oxide mixtures having mass ratios of 2:8, 3:7, 4:6, and 5:5, respectively. The Mössbauer spectra of the mixtures after leaching were composed of two sextets with respective isomer shifts (δ) and internal magnetic fields (H) of 0.29±0.01 mm s-1 and 48.8±0.1 T, and 0.64 ±0.01 mm s-1 and 45.5±0.1 T, attributed to the Fe3+ species in tetrahedral (T d) and the Fe2+ and Fe3+ mixed species (Fe2.5+) in octahedral (O h) sites, respectively. Mössbauer spectra of a 3:7 mass ratio iron-iron oxide mixture showed a gradual decrease in the absorption area (A) of zero valent iron (Fe0) from 40.6. to 12.6, 13.2, 3.8 2.8, and 1.0±0.5 % and an increase in A of Fe3O 4 from 31.8 to 59.4, 71.4, 93.2, 95.6, and 98.0±0.5 % after leaching with 10 mg L-1 TCE aqueous solution for 1, 2, 3, 7, and 10 days, respectively. Consistent values of the first-order rate constant were calculated as 0.32 day-1 for Fe0 oxidation, 0.34 day-1 for Fe3O4 production, and 0.30 day -1 for TCE decomposition, which indicates that the oxidation of Fe0 was the rate-controlling factor for Fe3O4 production and TCE decomposition. It is concluded from the experimental results that an iron-iron oxide mixture is very effective for the decomposition of TCE.

Original languageEnglish
Pages (from-to)23-30
Number of pages8
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume295
Issue number1
DOIs
Publication statusPublished - Jan 1 2013

Keywords

  • Fe-Mössbauer spectroscopy
  • Gas chromatography
  • Maghemite
  • Magnetite
  • Trichloroethylene (TCE)
  • Zero valent iron (Fe)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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