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In this study, gamma/H 2 O 2  and UV/H 2 O 2  treatment procedures were used for the degradation of five dyes including reactive red PB (R-24), reactive orange P 3 LN (O-13), reactive turquoise blue PG (B-21), reactive golden yellow H 2 R (O-12) and reactive lemon yellow C 4 G L (Y-15). The dye samples of 50 or 100 ppm concentration were treated with either gamma (0–10 kGy) or UV radiations in the presence/absence of H 2 O 2 . This treatment resulted in the elimination of chromophoric groups and degradation of dye molecule into low molecular weight fragments. The H 2 O 2  treatment caused the generation of hydroxyl radicals which degraded the pollutants non-selectively by means of chain oxidation process. The treatment effectiveness was increased when H 2 O 2 , which was used in conjunction with UV or gamma radiation and the treated water quality, improved significantly. However, the gamma/H 2 O 2  treatment was found to be the more effective and efficient method as compared to the UV/H 2 O 2  treatment for the removal of dyes from the water.

Radio-lytic degradation of reactive dyes in aqueous solution: comparative analysis using gamma/H 2 O 2 and UV/H 2 O 2 processes