科研之友
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摘要
In this study, we developed a Heterogeneous Electro-Fenton (Hetero-EF) system using an oxidized carbon nanotubes/iron oxychloride natural air diffusion electrode (OCNTs/FeOCl NADE) as the cathode, enabling simultaneous processes of O-2 diffusion, H2O2 electro-generation and the activation in liquid-gas-solid three-phase interfaces on the cathode. Experimental results showed that rapid ciprofloxacin (CIP) degradation was realized over a wide pH range (3-9). CIP was completely degraded in 90 min, with the total organic carbon (TOC) removal efficiency of 46.8% & PLUSMN; 1.9% under the condition of current 75 mA and initial pH 7. The electron paramagnetic resonance and radical quenching experiments revealed that the reactive species of .OH, .O-2(-) and O-1(2) were all involved in the process, with O-1(2) being the dominant contributor in CIP degradation. From the Fukui function based on the theoretical calculation and the degradation intermediates detected by LC-MS, the possible CIP degradation pathways were deduced. The toxicities of CIP degradation products were also predicted. This study demonstrated the feasibility of a simple and cost-effective integrated cathode combining the OCNTs/FeOCl catalyst exhibiting dual Fenton-like and oxygen reduction reaction (ORR) activity with the natural air diffusion electrode in a Hetero-EF system for efficient wastewater treatment.
