Heterogeneous reaction of gaseous ozone with aqueous iodide in the presence of aqueous organic species

Sayaka Hayase, Akihiro Yabushita, Masahiro Kawasaki, Shinichi Enami, Michael R. Hoffmann, Agustín J. Colussi

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The fast reaction of gaseous ozone, O3(g), with aqueous iodide, I-(aq), was found to be affected by environmentally relevant cosolutes in experiments using cavity ring-down spectroscopy (CRDS) and electrospray ionization mass spectrometry (ESIMS) for the detection of gaseous and interfacial products, respectively. Iodine, I2(g), and iodine monoxide radical, IO(g), product yields were suppressed in the presence of a few millimolar phenol (pKa = 10.0), p-methoxyphenol (10.2), or p-cresol (10.3) at pH 3 but unaffected by salicylic acid (pKa2 = 13.6), tert-butanol, n-butanol, or malonic acid. We infer that reactive anionic phenolates inhibit I2(g) and IO(g) emissions by competing with I -(aq) for O3(g) at the air/water interface. ESIMS product analysis supports this mechanism. Atmospheric implications are discussed.

Original languageEnglish
Pages (from-to)6016-6021
Number of pages6
JournalJournal of Physical Chemistry A
Volume114
Issue number19
DOIs
Publication statusPublished - May 20 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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