Abstract
The photocatalytic decomposition of indigo-5,5′-disulfonic acid (indigocarmine) and indigo-6,6′-dicarboxylic acid has been studied using TiO2 suspension and the polychromatic irradiation of a high-pressure Hg arc lamp. The dyestuffs were dissolved in aqueous medium at pH = 10 and photolyzed in a back-flow tubular photoreactor. The reaction products were determined by HPLC, NMR and MS spectroscopy. Two main photoproducts obtained from indigocarmine (2-amino-5-sulfobenzoic acid and isatine-5-sulfonic acid) were detected. The photocatalysis of indigo-6,6′-dicarboxylic acid gave aminoterephthalic acid and isatine-6-carboxylic acid as two main products. The quantitative analyses of reaction products were performed with UV/Vis and HPLC using chemical standards. A stoichiometric model and kinetic description of photocatalysis of sulfo and carboxy indigo dyes are suggested. The effect of hydroxide and carbonate anions on the rate of photocatalysis was also studied.
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The support from Research Grant GA104/09/0694, the Czech Republic, is gratefully acknowledged. Authors also thank to Dr. J. Panchartek for careful text revision.
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Machalický, O., Lichý, L., Tomica, M. et al. Photocatalysis of sulfo and carboxy derivatives of indigo in a TiO2 slurry with the use of polychromatic irradiation. Reac Kinet Mech Cat 107, 63–77 (2012). https://doi.org/10.1007/s11144-012-0442-4
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DOI: https://doi.org/10.1007/s11144-012-0442-4