Decomposition of a Diazo Dye in Aqueous Solutions by KMnO4 /UV/H2O2 Process

This study examined the photolytic degradation of c.i. acid red 73(ar73), in aqueous solution by kmno4/uv/h2o2 process. a continuous circulated photoreactor equipped with a uv lamp was used. (i) potassium permanganate was used for decolourisation of ar73 dye solution. the stoichiometric amount of potassium permanganate required for 1 mol of ar73 complete color removal was determined (2.79 mol). in the acidic solution, 100% of ar73 color removal and near 10% dye mineralization have been observed in no more than 5 minutes. (ii) after decolourisation period, uv/h2o2 system was applied for mineralization of the dye solution. under the best operational conditions, after 180 minutes of uv irradiation, 90% of dye mineralization was observed. iii) the results of this method were compared with those of obtained by using uv/h2o2 system (without kmno4). it was found that within the same irradiation time, kmno4/uv/h2o2 process is about 10% more effective for mineralization of ar73 dye solution. prog. color colorants coat. 5(2012), 41-46. © institute for color science and technology