Inhibition of humic substances mediated photooxygenation of furfuryl alcohol by 2,4,6-trimethylphenol. Evidence for reactivity of the phenol with humic triplet excited states
| Autor: | Claire Richard, and Abdelaziz Boulkamh, Sabrina Halladja, Jean-Pierre Aguer, Alexandra ter Halle |
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| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Singlet Oxygen Singlet oxygen Photochemistry Alcohol General Chemistry Reaction inhibitor Furfuryl alcohol Oxygen chemistry.chemical_compound Cresols Kinetics chemistry Environmental Chemistry Photooxygenation Humic acid Soil Pollutants Singlet state Triplet state Furans Humic Substances |
| Zdroj: | Environmental sciencetechnology. 41(17) |
| ISSN: | 0013-936X |
| Popis: | To probe the reactivity of 2,4,6-trimethylphenol with humic triplet excited states, we investigated its influence on the humic substances-mediated photooxygenation offurfuryl alcohol. Elliott soil humic and fulvic acids were employed for these experiments. When added in the concentration range of 10(-4) - 10(-3) M, 2,4,6-trimethylphenol inhibited furfuryl alcohol photooxygenation to an extent depending on its concentration. The inhibiting effect decreased as the oxygen concentration was increased. By postulating that 2,4,6-trimethylphenol competes with oxygen for reaction with humic triplet excited states and with furfuryl alcohol for reaction with singlet oxygen, we obtained kinetic laws describing the consumption profiles of furfuryl alcohol and 2,4,6-trimethylphenol. Experimental rates of 2,4,6-trimethylphenol and furfuryl alcohol loss could be satisfactorily fitted with 1.09-1.16 for the ratio k2/k3, where k2 and k3 are the reaction rate constants of humic triplet excited states with oxygen and 2,4,6-trimethylphenol, respectively. These types of experiments could be extended to a variety of substrates to measure their reaction rate constants with humic triplet excited states. |
| Databáze: | OpenAIRE |
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