Photo-Induced OH reactions of naphthalene and its oxidation products on SiO2
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The photo-induced degradation of naphthalene, 1,4-naphthoquinone, 1-naphthol and 1-NO2 naphthalene, adsorbed on silica gel, and with the addition of nitrogenous air pollutants e.g. NO2 (as KNO2) was investigated. Results indicate that compounds adsorbed onto a solid carrier are degraded when irradiated with UV light (λ > 290 nm) in the presence of nitrites. The key species initiating the naphthalene degradation is the OH-radical which is generated through the photolysis of NO2. Reaction products identified were 2-formyl-cinnamaldehyde, 1,4-naphthoquinone, nitronaphthol, o-phthaldialdehyde, phthalide and nitronaphthalene. A mass balance between 40–50% was achieved. Under the same irradiation conditions, 1-NO2 naphthalene is mainly degraded by direct photolysis while degradation of 1-naphthol and 1,4-naphthoquinone proceeds via the reaction with OH-radicals. Identified products were hydroxy-nitro-nitroso- and quinones compounds.
Keywords1-naphthol 1-NO2 naphthalene heterogeneous reactions naphthalene nitrite silica gel
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- Brussol, C.; Duane, M.; Larsen, B.; Caruer, P.; Kotzias, D. (1997): OH radical initiated degradation of solid carrieradsorbed PAHs. Proceeding of the seventh European symposium on the physico-chemical behaviour of the atmospheric pollutants. Ed. B. Larsen et al., EUR 17482 EN, pp. 65–68Google Scholar
- Glasius, M.; Duane, M.; Larsen, B. (1998): Analysis of polar terpene oxidation products in aerosols by liquid chromatography ion trap mass spectrometry. Submitted to J. Chromatogr.Google Scholar
- Brussol, C.; Duane, M.; Nicollin, B.; Carlier, P.; Kotzias, D. (1998): Reaction of naphthalene in the NOx photochemical system. Fresenius Environ. Bull., in pressGoogle Scholar
- Machado, F.;Boule, P. (1994): Phototransformation of phenolic derivatives in aqueous solution induced by excitation of nitrate or nitrite ions. Trends in photochemistry & photobiology 3, 29–37Google Scholar