The study of the effects of the variables on H2O2/UV decoloration of vinylsulphone dye:: part II

As a continuation of part I [Dyes and Pigments 42 (1999), 123] where modeling of H2O2/UV decoloration of monochlorotriazine azo dye C.I. Reactive Red 120 was discussed, this part deals with the study of the effects of the variables on H2O2/UV decoloration of reactive vinylsulpone dye C.I. Reactive Blue 19. Influence of chemicals (NaOH, NaCl, urea), added to the dye-bath for dyeing with stated colorant, as well as the influence of reaction conditions (intensity of UV irradiation, concentration of hydrogen peroxide and decoloration time) is described. Influences were determined by the measurement of ecological parameters: absorbance, COD, TOC and TIC. (C) 2002 Elsevier Science Ltd. All rights reserved.