Oxidation towards enrofloxacin degradation over nanoscale zero-valent copper: mechanism and products

文献类型： 外文期刊

第一作者： Gong, Zhiqiang

作者： Gong, Zhiqiang;Xie, Junpu;Liu, Ting;Chen, Jianwu;Gan, Jinhua;Gong, Zhiqiang;Xie, Junpu;Liu, Jingxin;Li, Jinping

作者机构：

关键词： Enrofloxacin; Nanoscale zero-valent copper; Oxidation; Degradation mechanisms

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：5.8； 五年影响因子：5.4 ）

ISSN： 0944-1344

年卷期： 2022 年

页码：

收录情况： SCI

摘要： Enrofloxacin (ENR) is a widely used veterinary fluoroquinolone antibiotic and is frequently detected in water environments. The degradation of ENR was examined utilizing molecular oxygen mediation using nanometer zero-valent copper (nZVC) as the catalyst in this work. The dosage of nZVC, initial pH, and reaction temperature were investigated as contributing factors to ENR degradation. The effects of Cl-, NO3-, SO42-, and humic acid on the degradation of ENR were investigated. The actual effects were evaluated using natural water. The reactive oxygen species (ROS) that participated in the reaction were identified, their generation mechanisms were elucidated, and the effects on ENR degradation were assessed. More emphasis was given to exploring ENR degradation and transformation pathways via analyses of HPLC-TOF-MS. Data showed that at 35 ?, with an initial pH of 3 and exposed to air, an nZVC dose of 0.5 gmiddotL-1 degraded ENR by 99.51% dramatically. HO center dot radicals were identified as the dominant ROS, and conversions among Cu0, Cu+, and Cu2+ played crucial roles in the generation of ROS. The destruction mechanism of ENR was speculated based on analyses of HPLC-TOF-MS results as the transformation of the piperazine ring into an oxidized state with a-COOH substitution with HO center dot, which caused ENR to be mineralized and converted into CO2, H2O, and NO-3 . The ECOSAR program has been used to evaluate the toxicity of ENR and its degradation products, and oxidative degradation of nZVC significantly reduced its toxicity and increased its biodegradability. This research proposes a capable and practical method for removing ENR from water.

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