期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 56, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jwpe.2023.104427
关键词
PMS activation; LEV degradation; Reactive oxidizing species
A Co-doped g-C3N4 catalyst with non-uniform pores was synthesized for the degradation of levofloxacin. The catalyst showed good catalytic activity and stability, maintaining good activity in the pH range of 5-9. The study also revealed the degradation mechanisms and pathways of levofloxacin.
Co is a transition metal with a promising catalytic effect. Catalytic activation of peroxymonosulfate (PMS) and peroxydisulfate (PDS) using cobalt-based catalysts has received increasing attention as a promising technology that can remove difficult-to-degrade pollutants from water. Herein, a porous Co-doped g-C3N4 catalyst Cox/CN with non-uniform pores was synthesized to investigate the degradation of levofloxacin (LEV) by its activated peroxymonosulfate (PMS). The results showed that Co was uniformly distributed in g-C3N4 in the form of Co-N bonds, which provided more active sites for the activation of PMS. The catalytic performance of Cox/CN was investigated by factors such as Co doping, catalyst dosing, PMS dosing, initial pH of the solution, and reaction temperature, and it was found that Cox/CN could maintain good catalytic activity in the pH range of 5-9. The cyclic catalytic degradation experiments showed that Cox/CN has good stability and reusability. The degradation mechanisms and pathways of LEV were also revealed such that SO4 center dot was the main reactive oxidizing species (ROS), and LEV was degraded to organic compounds of smaller molecular mass through six pathways. This study offered a new strategy for synthesizing structurally diverse non-homogeneous Co-based catalysts and for the degradation of antibiotics.
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