Acetone-photosensitized reduction of carbon tetrachloride by 2-propanol in aqueous solution

Eric Betterton, Nadia Hollan, Robert G Arnold, Stefan Gogosha, Krista Mckim, Zhijie Liu

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Simple carbonyl chromophores can be used to facilitate the solar- promoted reductive dehalogenation of halo-organics. Here we describe the kinetics and mechanism of the reductive dehalogenation of carbon tetrachloride (CT) to chloroform (CF) in the presence of aqueous acetone and 2-propanol, which is added as a hydrogen donor. The reaction is rapid in sunlight, stoichiometrically converting 3 mM CT to CF in approximately 2 min. Under typical conditions (0.69 M acetone, 5.7 M 2-propanol, 3 mM CT) using a 75 W Xe lamp, the observed zero-order reaction occurs at a rate of 2.7 x 10- 6 M s-1. The mechanism appears to become first order in CT near the end of the reaction. The zero-order reaction rate increased with both acetone- and 2-propanol concentration and also with absorbed light intensity. Other combinations of carbonyls, alcohols, and halogenated organics are also effective.

Original languageEnglish (US)
Pages (from-to)1229-1233
Number of pages5
JournalEnvironmental Science and Technology
Volume34
Issue number7
DOIs
Publication statusPublished - Apr 1 2000

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ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Environmental Engineering

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