College of Biological Resources and Environmental Science, Jishou University , Hunan , People's Republic of China.
College of Resources and Environment, Hunan Agricultural University , Changsha , People's Republic of China.
Environ Technol. 2019 Nov;40(27):3632-3640. doi: 10.1080/09593330.2018.1483972. Epub 2018 Jun 13.
The degradation of norfloxacin by Fenton reagent with core-shell Fe@FeO nanomaterials was studied under neutral conditions in a closed batch system. Norfloxacin was significantly degraded (90%) in the Fenton system with Fe@FeO in 30 min at the initial pH 7.0, but slightly degraded in Fenton system without Fe@FeO under the same experimental conditions. The intermediate products were investigated by gas chromatography-mass spectrometry, and the possible Fenton oxidation pathway of norfloxacin in the presence of Fe@FeO nanowires was proposed. Electron spin resonance spectroscopy was used to identify and characterize the free radicals generated, and the mechanism for norfloxacin degradation was also revealed. Finally, the reusability and the stability of Fe@FeO nanomaterials were studied using x-ray diffraction and scanning electron microscope, which indicated that Fe@FeO is a stable catalyst and can be used repetitively in environmental pollution control.
采用核壳结构的 Fe@FeO 纳米材料作为 Fenton 试剂，在封闭的间歇式体系中研究了在中性条件下诺氟沙星的降解情况。在初始 pH 值为 7.0 的条件下，Fe@FeO 存在的 Fenton 体系中，诺氟沙星在 30 min 内被显著降解（90%），但在相同实验条件下，没有 Fe@FeO 的 Fenton 体系中则略有降解。通过气相色谱-质谱联用技术对中间产物进行了研究，并提出了在 Fe@FeO 纳米线存在的情况下诺氟沙星的可能的 Fenton 氧化途径。电子顺磁共振光谱用于鉴定和表征生成的自由基，也揭示了诺氟沙星的降解机制。最后，通过 X 射线衍射和扫描电子显微镜研究了 Fe@FeO 纳米材料的可重复使用性和稳定性，表明 Fe@FeO 是一种稳定的催化剂，可在环境污染控制中重复使用。
