Abstract
This study reports the efficiency of gamma-ray irradiation to degrade quinolone antibiotic, norfloxacin, in aqueous solution. Laboratory batch experiments were conducted to determine the “pseudo-first” order degradation kinetics of norfloxacin in the concentration ranges of 3.4–16.1 mg L−1 by gamma-ray irradiation. The dose constant was found to be dependent on the initial concentration of norfloxacin and gamma-ray irradiation dose rate (D r). The saturation of norfloxacin sample solutions with N2, air or N2O, and the presence of tert-butanol and 2-propanol showed that •OH played more crucial role in the degradation of norfloxacin. The second order rate constants of •OH, eaq −, and •H with norfloxacin were calculated to be 8.81 × 109, 9.54 × 108, and 1.10 × 109 M−1 s−1, respectively. The effects of various additives including CO3 2−, HCO3 −, NO3 −, NO2 −, and thiourea and the pH of the medium on the degradation of norfloxacin were also investigated. Norfloxacin degradation was lower in surface water and wastewater than in ultrapure water. Several degradation byproducts of norfloxacin were identified from which the possible degradation pathway was proposed.
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Acknowledgments
HMK is grateful to the Higher Education Commission of Pakistan (HEC) for research project (HEC 20–376) and MS also acknowledges HEC for financial support of this work under research project SRGP No. 730.
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Sayed, M., Khan, J.A., Shah, L.A. et al. Degradation of quinolone antibiotic, norfloxacin, in aqueous solution using gamma-ray irradiation. Environ Sci Pollut Res 23, 13155–13168 (2016). https://doi.org/10.1007/s11356-016-6475-x
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DOI: https://doi.org/10.1007/s11356-016-6475-x