Abstract:

A kinetic model of the decoloration process based on the example of a water solution of the anthraquinone dye Acid Blue 62 was proposed. The importance of decoloring water solutions for the textile industry is emphasised. The wastewater remaining after yarns and fabrics are dyed is generally too coloured for re-use in technological applications or in surface water circulation. A common schematic of the reactions initiated by a hydroxyl radical was proposed for decolouring solutions during an irradiation process in the presence of nitrous oxide, a photochemical process with hydrogen peroxide and induced by ozone. In each version of the model, a different method was considered for generating hydroxyl radicals (HO). On the basis of experimental data, the model parameters describing the decoloration process were estimated, and the experimental data were compared with theoretical calculations. A relatively good agreement of the comparison was obtained.