Ozonation of azo dye Acid Black 1 under the suppression effect by chloride ion

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Abstract

The aim of this study is to determine the kinetics of the Acid Black 1 dye by oxidizing action of ozone and to evaluate the influence of chloride ion contamination on the dye degradation. Pseudo-first order kinetics was observed for both decolorization (620 nm) and aromatic structure (321 nm) degradations. A complete color removal was verified in 25 min ([dye]0 = 1.8 × 10 -5 mol L-1), while aromatic structures degraded at slower rates. The presence of chloride ion, the principal impurity of the solid dye reagents, influences significantly the ozonation rate (-42%), even at low chloride concentration (5.6 × 10-4 mol L-1). The most probable mechanism for the chloride suppression effect involves a direct reaction between O3 and Cl- generating HOCl, among other by-products. In despite of that, ozonation could be a competitive degradation process for this dye. © 2010 Sociedade Brasileira de Química.

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Paprocki, A., Dos Santos, H. S., Hammerschitt, M. E., Pires, M., & Azevedo, C. M. N. (2010). Ozonation of azo dye Acid Black 1 under the suppression effect by chloride ion. Journal of the Brazilian Chemical Society, 21(3), 452–460. https://doi.org/10.1590/S0103-50532010000300009

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