Gallic acid influence on azo dyes oxidation by Fenton processes
The present work consisted in evaluating the effect of a natural plant reducer, gallic acid (GA), on the discolouration/oxidation of two azo dyes by Fenton processes (Fe3+/H2O2 and Fe2+/H2O2). A kinetic study was performed to better interpret the discolouration data at different temperatures. The 1s...
| Veröffentlicht in: | Environmental technology. - 1993. - 43(2022), 22 vom: 25. Sept., Seite 3390-3400 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2022
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| Zugriff auf das übergeordnete Werk: | Environmental technology |
| Schlagworte: | Journal Article Fenton reaction dyes gallic acid hydroxyl radical kinetics Azo Compounds Coloring Agents Gallic Acid 632XD903SP mehr... |
| Zusammenfassung: | The present work consisted in evaluating the effect of a natural plant reducer, gallic acid (GA), on the discolouration/oxidation of two azo dyes by Fenton processes (Fe3+/H2O2 and Fe2+/H2O2). A kinetic study was performed to better interpret the discolouration data at different temperatures. The 1st-order kinetic model presented the best fit for the experimental data of methyl orange discolouration, while the 2nd-order was better for chromotrope 2R. Due to the addition of GA and the temperature rise, there were increases in discolouration and in the reaction rate constant values. As a highlight, it was possible to verify the reduction of the apparent activation energy (Ea) due to the presence of GA. For example, Ea for discolouring methyl orange corresponded to 81.5 and 53.6 kJ.mol-1 by Fe2+/H2O2 and Fe2+/H2O2/GA, respectively. Thus, it can be inferred that the GA reduces the energy barrier to increase the oxidation of dyes by Fenton processes |
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| Beschreibung: | Date Completed 12.09.2022 Date Revised 12.09.2022 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1479-487X |
| DOI: | 10.1080/09593330.2021.1921855 |