Radiolytic degradation of ornidazole in aqueous solutions by electron beam irradiation: Implications to parameters, kinetics, toxicity and cost evaluation
Radiolytic degradation of ornidazole in aqueous solutions by electron beam irradiation: Implications to parameters, kinetics, toxicity and cost evaluation
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DOI：
10.1016/j.jece.2020.104423
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发表时间：
2020-08
影响因子：
7.7
通讯作者：
Rahil Changotra;Jhimli Paul Guin;S. Khader;A. Dhir
中科院分区：
文献类型：
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作者：
Rahil Changotra;Jhimli Paul Guin;S. Khader;A. Dhir
The study is aimed to assess the effectiveness of electron beam (EB) technology to degrade the antibiotic ornidazole (ORN) in aqueous solution. The influence of several factors viz. initial ORN concentrations, dose, pH of solution, and addition of N O 2−, N O 3−, isopropanol, H 2 O 2, thiourea, and different water mediums were evaluated on the ORN degradation. The degradation of ORN was followed by pseudo first-order reaction kinetics with rate constant value of 2.01, 1.17, 0.87 and 0.70 kGy− 1 for the initial concentrations of 25, 50, 75, and 100 mg L− 1 with their corresponding (G-(ORN)) values of 0.93, 1.60, 1.97, and 2.12 μmol J− 1, respectively. The presence of N O 2−, thiourea and isopropanol revealed reduction in the k-value, whereas, addition of N O 3− anion had not substantially effected the degradation of ORN. Presence of H 2 O 2 exhibits significant effect on the mineralization efficiency of ORN rather than degradation extent. The efficacy of EB irradiation to degrade ORN decreased in wastewater in comparison to surface, ground and ultrapure water. Based on the LC-QTOF-MS study, it could be ascribed that degradation of ORN was primarily due to the oxidative species HO radical dot radical and direct cleavage of ORN compound. Tentative pathways for EB-induced radiolytic degradation of ORN were proposed. Cytotoxicity assessment and overall cost of electrical energy consumed for the degradation of ORN was also evaluated.
