UV-induced Decomposition of Ozone and Hydrogen Peroxide in the Aqueous Phase at pH 2–7
| Autor: | István Horváth, András Dombi, Gyula Wittmann |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | Ozone: Science & Engineering. 24:281-291 |
| ISSN: | 1547-6545 0191-9512 |
| DOI: | 10.1080/01919510208901619 |
| Popis: | The photolysis of ozone and formation of hydrogen peroxide were investigated in solution of pH 2–7, in a 200 cm3 photoreactor in the incident photon flow range 9.6 x 10−8 - 4.2 x 10−7 einstein s−1. The quantum yield of the primary photochemical reactions was measured in a direct way by suppressing the secondary radical reactions. The determined quantum yields of the photo-decompositions of ozone and hydrogen peroxide were 0.42 ± 0.042 ± 0.04 and 0.49 ± 0.04, respectively. A correct mathematical treatment is given for calculation of the light absorption of the individual components of a multi-absorbent reaction mixture. On the basis of the literature data and die present results, a probable chemical and reaction kinetic model was proposed to characterize the investigated reaction systems. Reaction kinetic simulations demonstrated that the model predicts a good fit to the measured data with the preferred literature rate constants, except that for the HO3 radical decomposition reaction. A reasonable... |
| Databáze: | OpenAIRE |
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