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Synthetic dyes are characterized by their high toxicity, low biodegradability, carcinogenicity and persistent nature in the environment. Advanced oxidation processes (AOPs) offer a promising approach for degrading dyes in aqueous media. In this study, Reactive Blue 222 (RB 222) dye was treated with Cs-137 gamma radiation in the dose range of 1 to 5 kGy and UV radiation for 30 to 150 min, in the presence of hydrogen peroxide (H2O2) as an oxidant (0.1 to 0.5 mL/L) at different initial dye concentrations. In case of UV irradiation, the maximum dye degradation was achieved at 80.28% for a 50 mg/L dye concentration after 150 min, which was enhanced to 84.92% in the presence of H 2 O 2 . For the gamma ray treatment, degradation was 98.87% at a 5 kGy absorbed dose and reached 100% in combination with H 2 O 2 for a 50 mg/L dye initial concentration. The Chemical Oxygen Demand (COD) reduction was 55% and 68% for the UV (150 min) and gamma (5 kGy) treatments, respectively. The Biological Oxygen Demand (BOD) reductions were observed to be 45.25% and 55.61%, while Total Organic Carbon (TOC) removal was 44.97% and 54.43% under these respective treatments, respectively. The dye degradation was pronounced in acidic media versus basic conditions of the medium. The G-value of the degradation was observed to be 0.68, 1.20, and 1.83 for 50, 100, and 150 mg/L RR 222 concentrations, respectively. The dose constant values were 0.80, 0.77, and 0.68 for gamma radiation and 0.90, 0.79, and 0.71 for gamma radiation/H 2 O 2 treatment. The results confirm that AOPs provide an effective and versatile strategy for the rapid degradation and mineralization of synthetic dyes in wastewater systems.
Ali et al. (Thu,) studied this question.