High energy radiation induced degradation of reactive yellow 145 dye: A mechanistic study

Gamma and UV radiation alone and in the presence of oxidant (H2O2) were employed for the degradation of reactive yellow 145 dye. The observed degradation was 82.73 and 77.93% under UV radiation, while 100 and 94.84% using gamma ray treatment for 50 and 100 mg/L drug initial concentrations along with H2O2, respectively. The reduction in COD was noted as 73 and 60% for 50 and 100 mg/L dye initial concentrations using gamma/H2O2 combined process, respectively. The pH was reduced significantly when the samples were treated with gamma/H2O2. The removal efficiency (G-value), dose constant (k), D0.50, D0.90 and D0.99 of gamma-ray treated samples were also evaluated. The cytotoxicity and mutagenicity were measured, which reduced significantly in response of radiation treatment. The 44.45 and 55.56% decrease in cytotoxicity was shown by the Allium cepa, whereas 77.45 and 80.41% in case of hemolytic while 83.75 and 88.65% reduction in cytotoxicity was noted by the shrimp assay using UV/H2O2 and gamma/H2O2 treatments, respectively. The mutagenicity of dye solutions was reduced to 78.25 and 83.13% (in case of TA98), while 82.53 and 85.32% (in case of TA100) using UV/H2O2 and gamma/H2O2 processes, respectively. Results suggested that AOP can efficiently be used to degrade and detoxify the textile wastewater. •High energy irradiation induced degradation of Yellow 145 dye was evaluated.•Kinetics, G-value, dose constants were evaluated as a function radiation absorbed dose.•Effect of dose on degradation, water quality and toxicity reduction was studied.•Gamma/H2O2 reduced toxicity of dyes along with improvement in water quality.•High energy radiation induced degradation of dye was promising.