首页|Performance and degradation pathways of bromuconazole by gamma radiation in aqueous solutions
Performance and degradation pathways of bromuconazole by gamma radiation in aqueous solutions
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Gamma irradiation has received increasing attention due to its high potential in the degradation of recalcitrant pollutants. Thus, in the present study, gamma irradiation was used for the degradation of bromuconazole with the presence of hydrogen peroxide (H2O2) as a source of *OH and humic acid as natural organic matter. The effects of initial concentration, irradiation doses and pH were examined. A kinetic study was performed, and the by-products were identified by HPLC-QTOF-MS/MS. Results showed that the degradation process of bromuconazole was pseudo-first-order and 99.9% of bromuconazole was decomposed under an absorbed dose of 1 kGy. The percentage of removal increased with doses and the degradation process was accelerated under neutral conditions. The addition of H2O2 showed a synergistic effect on the decomposition of bromuconazole and the degradation efficiency increased with the increase of H2O2 concentration. Humic acid indicated a negative influence on the degradation efficiency, which decreased from 99.6% to 70.365% at a dose of 0.8 kGy when the humic acid concentration was 20 mg/L. Six degradation products were identified and the kinetic rates of three intermediate compounds were calculated using a Himmelblau-Jones-Bischoff numerical analysis technique. A study conducted by ~1H NMR indicated a complete mineralization at 1.2 kGy.
Sciences and Environmental Technologies Laboratory, High Institute of Environmental Sciences and Technologies of Borj Cedria, University of Carthage, Borj Cedria, Tunisia
Research Laboratory on Matter and Energy for Nuclear Science Development, CNSTN, LR16CNSTN02, Sidi Thabet Technopark, 2020 Tunis, Tunisia
Department of Environmental Sciences, Saigon University, Ho Chi Minh City 70000, Viet Nam
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