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| Degradation of levofloxacin by electro-Fenton with CNT supported nano-iron cathode |
| FENG Fan, GUO Bo, CAO Qun, JIN Shi-yi, WANG Rui-lin, CHEN Cai-yu |
| Department of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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Abstract Carbon nanotubes (CNT) were modified using concentrated sulfuric acid, and the modified CNTs (MCNT) were employed as the support for iron (MCNT-Fe) to construct a heterogeneous electro-Fenton system with the cathode of MCNT-Fe for the removal of levofloxacin (LFV). Characterization results of the cathode material by SEM, XPS, XRD, and FTIR revealed that the loaded iron existed in the form of nano-Fe2O3 with the majority of particles (>80%) being smaller than 8nm, while various oxygen-containing functional groups were found on the surface of MCNT. Analysis of the cyclic voltammetry curves (CV) and impedance spectra (EIS) of the cathode materials indicated that the MCNT-Fe cathode exhibited greater oxygen reduction activity and stronger electron transfer capability than CNT and MCNT. Consequently, the electro-Fenton with the MCNT-Fe cathode demonstrated higher LFV removal efficiency. Under optimized conditions, the LFV removal efficiency could reach 92.7%~95.7% in range of pH 3~9 after 240min reaction. The Singlet oxygen (1O2) was identified as the primary reactive oxygen species (contributing to 64.6%). Furthermore, the MCNT-Fe cathode exhibited stable performance during multiple cycles with LFV removal rate of 89.3% after six cycles. The expanded pH range, stable cathode performance, and excellent LFV removal performance make the electro-Fenton method with MCNT-Fe cathode highly suitable for practical application. The proposed mechanism for the formation of 1O2 provides theoretical support for its application.
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Received: 21 February 2024
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