Singlet oxygen mediated the selective removal of oxytetracycline in C/Fe3C/Fe0 system as compared to chloramphenicol,Environment International

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Singlet oxygen mediated the selective removal of oxytetracycline in C/Fe3C/Fe0 system as compared to chloramphenicol
Environment International ( IF 10.3 ) Pub Date : 2020-07-03 , DOI: 10.1016/j.envint.2020.105899
Nan Zhao ₁ , Kunyuan Liu ₁ , Chao He ₁ , Jia Gao ₁ , Weihua Zhang ₁ , Tingjie Zhao ₁ , Daniel C W Tsang ₂ , Rongliang Qiu ₃

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Reactive oxygen species (ROS) production for Fe is limited because of the formed iron corrosion products. In this study, C/FeC/Fe composite which produces enhanced ROS has been specifically designed and fabricated to remove typical antibiotics (i.e., oxytetracycline (OTC) and chloramphenicol (CAP)) as a heterogeneous Fenton-like catalyst. The C/FeC/Fe composite demonstrated excellent performance for both OTC and CAP removal as compared with Fe and biochar. Furthermore, X-ray photoelectron spectrometry, Fourier transform infrared spectrometry, high performance liquid chromatography-mass spectra and electron spin resonance analyses were conducted to elucidate the adsorption and degradation mechanisms. The adsorption of OTC and CAP was mainly dominated by H bonds and the electron-acceptor-acceptor on the surface of the C/FeC/Fe composite, respectively. In particular, OH simultaneously induced the degradation of OTC and CAP, while O presented the selective oxidation to OTC. More specifically, the degradation of OTC over C/FeC/Fe was stronger and faster than that of CAP, leading to 65.84% and 16.84% of removal efficiency for OTC and CAP, respectively. Furthermore, C/FeC/Fe exhibited superior reusability and stability after regeneration, but regenerated Fe almost lost its reactivity. Therefore, the efficiency in situ generation of O using C/FeC/Fe would shed new light on the selective oxidation of aqueous organic compounds.

中文翻译：

与氯霉素相比，单线态氧介导 C/Fe3C/Fe0 体系中土霉素的选择性去除

由于形成铁腐蚀产物，Fe 的活性氧 (ROS) 产生受到限制。在这项研究中，C/FeC/Fe 复合材料经过专门设计和制造，可产生增强的 ROS，作为非均相类芬顿催化剂去除典型抗生素（即土霉素 (OTC) 和氯霉素 (CAP)）。与 Fe 和生物炭相比，C/FeC/Fe 复合材料在 OTC 和 CAP 去除方面表现出优异的性能。此外，还进行了X射线光电子能谱、傅里叶变换红外光谱、高效液相色谱-质谱和电子自旋共振分析来阐明吸附和降解机制。 OTC和CAP的吸附分别主要由C/FeC/Fe复合材料表面的H键和电子受体-受体主导。特别是，OH同时诱导OTC和CAP的降解，而O则对OTC进行选择性氧化。更具体地说，OTC 相对于 C/FeC/Fe 的降解比 CAP 更强、更快，导致 OTC 和 CAP 的去除效率分别为 65.84% 和 16.84%。此外，C/FeC/Fe在再生后表现出优异的可重复使用性和稳定性，但再生的Fe几乎失去了反应活性。因此，利用 C/FeC/Fe 原位生成 O 的效率将为水性有机化合物的选择性氧化提供新的思路。

更新日期：2020-07-03

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