Batch reactor kinetic studies on the reductive dechlorination of chlorinated ethylenes by tetrakis-(4-sulfonatophenyl)porphyrin cobalt

Brandon R. Barnett, Alexandra L. Evans, Courtney C. Roberts, Joseph M. Fritsch

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Tetrakis-(4-sulfonatophenyl)porphyrin cobalt was identified as a highly-active reductive dechlorination catalyst for chlorinated ethylenes. Through batch reactor kinetic studies, degradation of chlorinated ethylenes proceeded in a step-wise fashion with the sequential replacement of Cl by H. For perchloroethylene (PCE) and trichloroethylene (TCE), the dechlorination products were quantified and the C2 mass was accounted for. Degradation of the chlorinated ethylenes was found to be first-order in substrate. Dechlorination trials with increasing catalyst concentration showed a linearly increasing pseudo first-order rate constant which yielded rate laws for PCE and TCE degradation that are first-order in catalyst. The dechlorination activity of this catalyst was compared to that of another water-soluble cobalt porphyrin under the same reaction conditions and found to be comparable for PCE and TCE.

Original languageEnglish (US)
Pages (from-to)592-596
Number of pages5
JournalChemosphere
Volume82
Issue number4
DOIs
StatePublished - Jan 1 2011
Externally publishedYes

Keywords

  • Chlorinated ethylenes
  • Cobalt porphyrin
  • Kinetic studies
  • Reductive dechlorination

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