Accelerated Fenton reaction for antibiotic ofloxacin degradation in discharge plasma system based on graphene-Fe3O4 nanocomposites. (March 2021)

• Record Type: Journal Article
• Authors: Guo, He; Li, Zhen; Xie, Zhehao; Song, Jiaxi; Xiang, Liangrui; Zhou, Luoyan; Li, Caixia; liuni Liao, ; Li, Jie; Wang, Huijuan
• Is Part Of: Vacuum. Volume 185(2021)
• Publication Date: 2021-03
• Subjects: Fenton reaction -- Plasma -- Graphene-Fe3O4 -- Ofloxacin -- Degradation; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.110022
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: The reduced graphene oxide (rGO)-Fe3 O4 nanocomposites were proposed to promote Fenton reaction for ofloxacin (OFX) degradation in discharge plasma system. The morphology, structure and optical absorption properties of the prepared rGO-Fe3 O4 were characterized by SEM, TEM, XPS and UV-VIS spectrophotometer. The effect of various parameters on degradation efficiency of OFX was investigated. Besides, the effect of catalyst on the amount of ·OH in the discharge plasma system was analyzed. Finally, the degradation process of OFX was analyzed. The results showed that Fe3 O4 can be successfully loaded on graphene, and has strong optical absorption properties. Compared with Fe3 O4 alone, rGO-Fe3 O4 further improved the degradation efficiency and kinetic constant of OFX in discharge plasma system. The highest degradation efficiency and kinetic constant reached 99.9% and 0.108 min −1 respectively after 60 min treatment. Increasing applied voltage and decreasing the initial solution concentration were beneficial to OFX degradation. The rGO-Fe3 O4 enhanced ·OH formation in discharge plasma system. With the discharge going on, pH value of solution declined while the conductivity of solution increased. Compared with deionized water solution, the decrease of pH and the increase of conductivity in OFX solution were more obvious. The conjugated heterocyclic structure was destroyed gradually in the degradation process. Highlights: Graphene-Fe3 O4 were synthetized to promote ·OH generation and OFX degradation. Highest degradation efficiency of OFX reached 99.9% in plasma-catalytic system. Graphene-Fe3 O4 could further accelerated ·OH formation compared to pure Fe3 O4 . The pH value of the solution decreased and the conductivity increased gradually. The conjugated heterocyclic structure of OFX was destroyed after treatment.