Interaction of the indoor air pollutant acetone with degussa P25 TiO 2 studied by chemical ionization mass spectrometry

Catherine M. Schmidt, Eric Weitz, Franz M Geiger*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Preventing a build-up of indoor pollutant concentrations has emerged as a major goal in environmental chemistry. Here, we have applied chemical ionization mass spectrometry to study the interaction of acetone, a common indoor air pollutant, with Degussa P25 TiO 2, an inexpensive catalyst that is widely used for the degradation of volatile organic compounds into CO 2 and water. To better understand the adsorption of acetone onto Degussa P25, the necessary first step for its degradation, the experiments were carried out at room temperature in the absence of UV light. This allowed for the deconvolution of the nonreactive and reactive thermal binding processes on Degussa P25 at acetone partial pressures (10 -7-10 -4 Torr) commonly found in indoor environments. On average, 30% of the adsorbed acetone is bound irreversibly, resulting in a surface coverage of irreversibly bound acetone of ∼1 × 10 12 molecules/cm 2 at 3-4 × 10 -5 Torr. Equilibrium and dynamic experiments yield a sticking coefficient of ∼1 × 10 -4 that is independent of the acetone partial pressures examined here. Equilibrium binding constants and free energies of adsorption are reported.

Original languageEnglish (US)
Pages (from-to)9642-9650
Number of pages9
JournalLangmuir
Volume22
Issue number23
DOIs
StatePublished - Nov 7 2006

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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