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Gamma radiations have emerged as a potential tool to degrade and decolorize the industrial effluents containing synthetic dyes in eco friendly and efficient manner. The dose and exposure time required to achieve the efficient decolration are quite high using gamma radiations alone during gamma radiolysis of synthetic dyes. Studies have revealed that, it can be brought down significantly on addition of H 2 O 2  as it enhances the degree of decoloration. This happens due to the formation of highly oxidizing •OH radicals that are formed due to rapid reaction of H 2 O 2 with hydrated electrons formed during radiolysis of water. Further as the dose of H 2 O 2  increases, extent and rate of decoloration also increases up to a certain value referred to as critical dose. But further increase in dose of H 2 O 2  beyond this critical value affects the extent of decoloration adversely. In present communication, the gamma radiation induced decoloration of Methylene Blue, Malachite Green and Indigo Carmine dyes was achieved using various doses of H 2 O 2 . It was observed that, the value of H 2 O 2  Critical dose required for efficient decoloration varies from dye to dye indicating its dependence on structure and concentration of dye solutions.

Synergistic Effect of H2O2 Addition on Gamma Radiolytic Decoloration of Some commercial Dye Solutions