Abstract
This study is aimed at investigating the influence of different scavenger species of radicals that might possibly be involved in the TiO2/UVA photocatalytic degradation of Indigo Carmine dye. The effect caused by the presence of hydroxyl radicals (1-butanol and 2-propanol), positive holes (h+) (potassium iodide) and singlet oxygen (azide) was studied. Kinetics and optimal degradation conditions were evaluated using a factorial experiment design. The highest pseudo-first-order kinetics (k = 5.22 × 10−2 ± 0.002 and t1/2 = 13.25 ± 0.49 min) was achieved at pH 4.0, 6 mg L−1 of Indigo Carmine dye and 12 mg L−1 of TiO2. Mineralization was not achieved, and direct photolysis was not observed under the studied conditions. Indigo Carmine degradation occurs mainly due to oxidation in the positive hole (h+) followed by singlet oxygen action and on a smaller scale by hydroxyl radical. The use of the aforementioned radical scavengers made it possible to verify the mechanism and kinetics of Indigo Carmine dye through TiO2 heterogeneous photocatalysis.
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The authors would like to thank the Brazilian National Research Council (CNPq) (Process n. 201488/2016-7) and Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES) (Process n. 131639/2017-0) for financial support.
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Neto, J.S.G., Satyro, S., Saggioro, E.M. et al. Investigation of mechanism and kinetics in the TiO2 photocatalytic degradation of Indigo Carmine dye using radical scavengers. Int. J. Environ. Sci. Technol. 18, 163–172 (2021). https://doi.org/10.1007/s13762-020-02842-6
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DOI: https://doi.org/10.1007/s13762-020-02842-6