A INFLUENCE OF OPERATING PARAMETERS ON DECOLORATION OF INDIGO CARMINE SOLUTIONS USING GAMMA RADIATIONS

Abstract

Abstract: It has been observed that the process parameters influence the extent of decoloration of synthetic dyes during gamma radiolysis in aqueous solutions. The influence of some factors viz. concentration of dye, dye solution pH, addition of H₂O₂ on the colour bleaching of Indigo Carmine dye in aqueous medium was studied using ⁶⁰Co gamma radiation source (dose rate was 0.386 kGy/hr). The dose required for the thorough decoloration was observed to be the direct function of the dye concentration in the solution. Further, when pH of solution was increased, the extent of decoloration reduced, for all the concentrations. H₂O₂ addition had the accelerating effect on the overall decoloration. The addition of H₂O₂ was governed by the critical value which corresponds to optimum dose of H₂O₂ that is required for maximum decoloration.