Novel Contaminant Transformation Pathways by Abiotic Reductants

Shengwen Chen, Dimin Fan, Paul Tratnyek

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Environmentally relevant abiotic reductants, such as zerovalent iron (ZVI) and minerals containing divalent iron (DVI), react predominantly by electron-transfer mechanisms with a variety of contaminant and probe compounds. Other reduction mechanisms involving activated forms of hydrogen (Hads or H-) have been suggested, but most evidence for these is only from systems containing noble metals that catalyze hydrogen activation (e.g., Pd). Here, 2-chlorophenylethanol and relatives of this aromatic halohydrin are used as probe compounds to show that ZVI can affect reduction by several novel pathways that are not observed with DVI minerals. These pathways include dechlorination by intramolecular nucleophilic substitution and epoxide ring opening by reduction. The former appears to be catalyzed by hydroxyl groups associated with oxides on actively corroding ZVI, and the latter can arise from hydride transfer (from NaBH4) or electron transfer (from ZVI).

Original languageEnglish (US)
Pages (from-to)432-436
Number of pages5
JournalEnvironmental Science and Technology Letters
Volume1
Issue number10
DOIs
StatePublished - Sep 24 2014

ASJC Scopus subject areas

  • Ecology
  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Water Science and Technology

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