The electrochemical oxidation technique was studied to decolourize the dye Reactive Blue 19. Synthetic effluent was prepared to decolorize the color by electro oxidation using graphite electrode as both anode and cathode. Effect of dye concentration (100 - 400 ppm), effect of electrolyte concentration NaCl (0.025 - 0.1M), effect of pH (3, 5, 7, 9), effect of stirring speed (150-300 rpm) and effect current density (5-25V) on decolorization. It was observed that maximum decolourization was observed under optimistic conditions such as, NaCl concentration of 0.075M, initial pH 7.0, applied current density of 20Ma/cm2 , stirrer speed of 200rpm and electrolysis time of 60 min. The UV-Visible spectrum confirms the removal of color from aqueous solution.
Keywords: Reactive Blue 19; Electrochemical oxidation; Decolourization; Graphite electrode.