Ozonation of azo dye acid black 1 under the suppression effect by chloride ion

Journal of the Brazilian Chemical Society

Pires, Marçal¹  Azevedo, Carla M. N.¹  Hammerschitt, Marta E.¹  Paprocki, Alexandre¹  Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil¹  Santos, Heldiane S. dos¹ 

关键词: azo dye;    ozonation;    salt additives;    chloride ion;    suppression effect;   

DOI  :  10.1590/S0103-50532010000300009

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

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.

【 授权许可】

Unknown