Non-isothermal kinetic modelling of potassium indigo-trisulfonate dye discolouration by Horseradish peroxidase

摘要

Textile industries account for two-thirds of the total dyestuff market been responsible for the production of a large volume of effluent with unfixed dye. Aromatic dyes as potassium indigo-trisulfonate dye (PIT) are characterized as a chemically stable and complex molecule with high heat and light stability and with high toxicity even at low concentration. In order to evaluate an environmentally friendly method to remove potassium indigo-trisulfonate dye from aqueous solution, a commercial peroxidase (horseradish peroxidase, HPR) was used in the experimental and the data were modelled by the Arrhenius equation. According to the results, the best reaction conditions were obtained using 80 mg.L-1 of dye concentration, 45 degrees C, pH 5.0, 349.35 U.mL(-1), and 4.5 mM hydrogen peroxide concentration leading to a 96 of dye discolouration.