Abstract
This study investigates the degradation of synthetic azo dye solution containing direct red 80 (DR-80) by high energy ionizing γ- radiation (60Co). A Box-Wilson face centered central composite design (CCF) was used with variables of pH (3.0–11.0), dose of γ-irradiation (1–6 kGy) and concentration of dye (100–500 mg/L). The predicted model was found to be significant and the predicted values are close to the experimental values with minimum residuals within the range of + 3 to − 3 limits. The concentration of dye and dose of γ-irradiation were found to be significant parameters for the degradation of DR 80. The numerically optimized model for the degradation of DR 80 showed 62.83% degradation efficiency at initial dye concentration of 500 mg/L, initial pH of 6.64 and at 3.29 kGy dose of γ-irradiation. The relation between the percentage of degradation and G values for the degradation process were also established. The synergistic effect of H2O2 on increasing the G values at lower dose of γ-irradiation was exhibited. G value increases as the concentration of H2O2 increases up to 1 mM. The degradation of DR 80 follows pseudo-first order with the dose constant (d = 0.6347 kGy−1). This study explains the importance of G value in establishing the degradation kinetics of γ-irradiation induced process.
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Acknowledgements
The authors are thankful to Tamilnadu State Council for Science and Technology, India for providing an opportunity to do collaborative research through Young Scientist fellowship. One of the author (V.C.Padmanaban) is thankful to BRNS-BARC, Mumbai for providing research grant to carry out this research project (BRNS file number: 2013/20/35/10/BRNS/34).
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Padmanaban, V.C., Selvaraju, N., Vasudevan, V.N. et al. Augmented radiolytic (60Co γ) degradation of direct red 80 (Polyazo dye): optimization, reaction kinetics & G-value interpretation. Reac Kinet Mech Cat 125, 433–447 (2018). https://doi.org/10.1007/s11144-018-1410-4
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DOI: https://doi.org/10.1007/s11144-018-1410-4