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http://hdl.handle.net/10397/88332
Title: | Singlet oxygen mediated the selective removal of oxytetracycline in C/Fe3C/Fe0 system as compared to chloramphenicol | Authors: | Zhao, N Liu, K He, C Gao, J Zhang, W Zhao, T Tsang, DCW Qiu, R |
Issue Date: | 2020 | Source: | Environment international, 2020, v. 143, 105899 | Abstract: | Reactive oxygen species (ROS) production for Fe0 is limited because of the formed iron corrosion products. In this study, C/Fe3C/Fe0 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/Fe3C/Fe0 composite demonstrated excellent performance for both OTC and CAP removal as compared with Fe0 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/Fe3C/Fe0 composite, respectively. In particular, [rad]OH simultaneously induced the degradation of OTC and CAP, while 1O2 presented the selective oxidation to OTC. More specifically, the degradation of OTC over C/Fe3C/Fe0 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/Fe3C/Fe0 exhibited superior reusability and stability after regeneration, but regenerated Fe0 almost lost its reactivity. Therefore, the efficiency in situ generation of 1O2 using C/Fe3C/Fe0 would shed new light on the selective oxidation of aqueous organic compounds. | Keywords: | Antibiotics adsorption Biochar C/Fe3C/Fe0 composite Fe0 Oxidative degradation Stability/reusability |
Publisher: | Pergamon Press | Journal: | Environment international | ISSN: | 0160-4120 | DOI: | 10.1016/j.envint.2020.105899 | Rights: | © 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). The following publication Zhao, N., Liu, K., He, C., Gao, J., Zhang, W., Zhao, T., ... & Qiu, R. (2020). Singlet oxygen mediated the selective removal of oxytetracycline in C/Fe3C/Fe0 system as compared to chloramphenicol. Environment International, 143, 105899, is available at https://doi.org/10.1016/j.envint.2020.105899 |
Appears in Collections: | Journal/Magazine Article |
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