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Enhancement of gaseous iodine emission by aqueous ferrous ions during the heterogeneous reaction of gaseous ozone with aqueous iodide.
- Source :
-
The journal of physical chemistry. A [J Phys Chem A] 2013 Apr 11; Vol. 117 (14), pp. 2980-6. Date of Electronic Publication: 2013 Apr 02. - Publication Year :
- 2013
-
Abstract
- Gaseous I2 formation from the heterogeneous reaction of gaseous ozone with aqueous iodide in the presence of aqueous ferrous ion (Fe(2+)) was investigated by electron impact ionization mass spectrometry. Emission of gaseous I2 increased as a function of the aqueous FeCl2 concentration, and the maximum I2 formation with Fe(2+) was about 10 times more than without Fe(2+). This enhancement can be explained by the OH(-) scavenging by Fe(3+) formed from Fe(2+) ozonation to produce colloidal Fe(OH)3. This mechanism was confirmed by measurements of aqueous phase products using a UV-vis spectrometer and an electrospray ionization mass spectrometer. We infer that such a pH-buffering effect may play the key role in general halogen activations.
Details
- Language :
- English
- ISSN :
- 1520-5215
- Volume :
- 117
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- The journal of physical chemistry. A
- Publication Type :
- Academic Journal
- Accession number :
- 23485095
- Full Text :
- https://doi.org/10.1021/jp308407j