Dechlorination of trichloroethylene formed from 1,1,2,2-tetrachloroethane by dehydrochlorination in Portland cement slurry including Fe(II)

Bahngmi Jung, Bill Batchelor

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Transformation of 1,1,2,2-tetrachloroethane (1,1,2,2-TeCA) by Fe(II) in 10% cement slurries was characterized using a batch reactor system. 1,1,2,2-TeCA was completely converted to trichloroethylene (TCE) within 1 h in all experiments, even in controls with cement that did not include Fe(II). Therefore, complete degradation of 1,1,2,2-TeCA depends on the behavior of TCE. The half-life of TCE was observed to be 15 d when concentrations of Fe(II) and 1,1,2,2-TeCA were 98 mM and 0.245 mM, respectively. The kinetics of TCE removal was observed to be dependent on Fe(II) dose, pH and initial substrate concentration. Pseudo-first-order rate constants linearly increased with Fe(II) dose up to 198 mM when initial target concentration was 0.245 mM. Pseudo-first-order kinetics generally described the degradation reactions of TCE at a specific initial concentration, but a modified Langmuir-Hinshelwood model was necessary to describe the degradation kinetics of TCE over a wide range of initial concentrations. A surface reaction of TCE on active solids, which were formed from Fe(II) and products of cement hydration appears to control observed TCE degradation kinetics.

Original languageEnglish
Pages (from-to)726-734
Number of pages9
JournalChemosphere
Volume71
Issue number4
DOIs
Publication statusPublished - Mar 2008
Externally publishedYes

    Fingerprint

Keywords

  • 1,1,2,2-Tetrachloroethane
  • Degradative solidification/stabilization
  • Fe(II)
  • Portland cement
  • Reductive dechlorination
  • Trichloroethylene

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry

Cite this