1. Facile fabrication of Fe/Fe3C embedded in N-doped carbon nanofiber for efficient degradation of tetracycline via peroxymonosulfate activation: Role of superoxide radical and singlet oxygen.
- Author
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Zhu, Ke, Xia, Wen, He, Dongdong, Huang, Jin, He, Hongmei, Lei, Lele, Chen, Wenjin, and Liu, Xiaobo
- Subjects
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REACTIVE oxygen species , *ELECTRON paramagnetic resonance spectroscopy , *PEROXYMONOSULFATE , *TETRACYCLINE , *TETRACYCLINES , *SUPEROXIDES - Abstract
[Display omitted] • Fe/Fe 3 C embedded in N-doped carbon nanofiber (Fe/Fe 3 C@NCNF) was prepared successfully. • The zero-dimensional Fe/Fe 3 C nanoparticles were homogeneously distributed to one-dimensional NCNF. • Fe/Fe 3 C@NCNF exhibited excellent TC degradation over a wide range of pH 3–11. • Fe/Fe 3 C and graphitic N were the main active sites of Fe/Fe 3 C@NCNF. • Superoxide radical and singlet oxygen were primary ROS for the TC degradation. The toxic metal ions leaching and metal nanoparticles agglomeration were the critical issues for metal-based carbon materials during the peroxymonosulfate (PMS) activation processes. Herein, a facile strategy was first proposed that zero-dimensional Fe/Fe 3 C nanoparticles were embedded in one-dimensional N-doped carbon nanofiber (Fe/Fe 3 C@NCNF) to solve the above challenges. The as-obtained Fe/Fe 3 C@NCNF-800 possessed a low E a value (11.7 kJ/mol) and exhibited high activity for activating PMS to degrade tetracycline (TC) in a wide range of pH 3–11. As expected, the iron ions leaching concentration of Fe/Fe 3 C@NCNF-800 was very low (0.082 mg/L). Meanwhile, the Fe/Fe 3 C@NCNF-800 was easily recovered from the reaction solution due to its magnetic properties. Both superoxide radicals (O 2 ∙−) and non-radical of singlet oxygen (1O 2) were the primary reactive oxygen species (ROS) in the Fe/Fe 3 C@NCNF-800/PMS system via quenching tests and electron spin resonance spectroscopy (ESR). The catalytic mechanism suggested that the Fe/Fe 3 C and graphitic N were the main active sites in the Fe/Fe 3 C@NCNF-800 for PMS activation. This work provided a facile method for the preparation of Fe-based carbon materials with high catalytic ability, low metal leaching and easy recycling, showing a broad prospect for environmental applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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