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In the current study, the degradation of reactive orange 122 (RO 122) dye was carried out under UV and gamma irradiation in presence of H 2 O 2 . The effect of variables such as UV exposure time, gamma-ray absorbed dose, initial concentration of dye and oxidant dose were investigated. The removal of 64.10, 58.84 and 55.46 (%) was observed for 50, 100 and 150 (mg/L) dye concentrations, respectively using UV radiation time of 150 (min). The degradation was enhanced to 80.39, 69.95 and 67.01 (%) when UV radiation was employed in the presence of H 2 O 2  (0.5 mL/L) for above concentrations respectively. The degradation was further improved to 97, 92.54 and 81.32 (%) using 5 kGy absorbed dose along with H 2 O 2  (0.5 mL/L). The reduction in chemical oxygen demand (COD) was 77, 64 and 57 (%) using UV/H 2 O 2  (0.5 mL/L), while 63, 56 and 53 (%) in case of gamma/H 2 O 2  for aforementioned concentrations. The removal efficiency ( G -value), dose constants ( k ), dose indispensable for 50, 90 and 99 (%) degradation ( D   0.5 ,  D   0.90 , and  D   0.99 ) after the treatment with gamma radiation were determined. The  G -value was noted as 0.46–0.0711 for 50–150 mg/L dye concentration for gamma irradiated samples which improved to 0.57–0.1204 for above mentioned concentrations in presence of H 2 O 2 . The FTIR analysis showed that all the peaks were disappeared using gamma/H 2 O 2  at 5 kGy absorbed dose except a minor peak of −CO stretching. The degradation mechanism of dye followed pseudo-first-order kinetics. A significant decrease in peak area was observed by the HPLC analysis after treating the dye samples with gamma/H 2 O 2  (0.5 mL/L) at absorbed dose of 5 kGy which has proven the process efficiency for dye degradation.

Ionizing radiation based advanced oxidation process for reactive orange 122 dye degradation and kinetics studies