Heterogeneous photocatalysis of coumarin and 3-carboxycoumarinic acid effect of NaF and methanol on the transformation rate and formation rate of hydroxilated products
Using heterogeneous photocatalysis, it is complicated to determine the formation rate of hydroxyl radical (HO•) and its relative contribution to the transformation of various target substances. In this work we compared the transformation rate of coumarin and 3- carboxycoumarinic acid (3CCA), and the...
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| Dokumentumtípus: | Könyv része |
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2018
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| Sorozat: | Proceedings of the International Symposium on Analytical and Environmental Problems
24 |
| Kulcsszavak: | Analitikai kémia, Fotokatalízis |
| Online Access: | http://acta.bibl.u-szeged.hu/56277 |
| Tartalmi kivonat: | Using heterogeneous photocatalysis, it is complicated to determine the formation rate of hydroxyl radical (HO•) and its relative contribution to the transformation of various target substances. In this work we compared the transformation rate of coumarin and 3- carboxycoumarinic acid (3CCA), and the formation rate of their fluorescent hydroxylated intermediates under various experimental conditions. The fluorescent spectroscopic methods were optimized. The effect of NaF and methanol as a radical scavenger were also investigated. Coumarin poorly adsorbs on the surface of TiO2; addition of NaF has no effect on the adsorption capacity, while NaF significantly hinder the adsorption of 3CCA. NaF increases the transformation rate of both model compounds, while slightly decreases the formation of their hydroxylated intermediates. Methanol decreases the transformation rates, and this effect is less pronounced in the case of 3CCA, probably because of its favored adsorption on the TiO2 surface. |
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| Terjedelem/Fizikai jellemzők: | 53-57 |
| ISBN: | 978-963-306-623-2 |