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Kinetics and mechanism of photochemical reactions of peroxomonosulfate in the presence and absence of 2-propanol

✍ Scribed by Perumal Kanakaraj; Pichai Maruthamuthu

Publisher: John Wiley and Sons
Year: 1983
Tongue: English
Weight: 457 KB
Volume: 15
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550151205

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✦ Synopsis

The photochemical decomposition of peroxomonosulfate (PMS) in the presence and absence of 2-propanol at 25' C was found to obey an overall first-order rate -d [PMSIldt = k&"S]. In the absence of 2-propanol, the quantum yield @ for the decomposition of PMS was found to depend upon the concentration of PMS at [PMS] 6 2 X 10-M, and is independent of concentration at [PMS] > 2 X lO+M. The quantum yield in the presence of 2-propanol was found to be 3.03 at [PMS] = 1 X 10-2M and 4.45 at higher concentrations of PMS. In the pH range of 2-9.0 the quantum yield was found to be independent of pH, and the overall rate constant k , was found to be 6.49 X s-l and 1.68 X loT3 s-l, respectively, in the presence and absence of isopropanol. A suitable chain mechanism is proposed and explained.

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