Abstract
Abstract The reduced graphene oxide (rGO)-Fe3O4 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-Fe3O4 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 Fe3O4 can be successfully loaded on graphene, and has strong optical absorption properties. Compared with Fe3O4 alone, rGO-Fe3O4 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-Fe3O4 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.
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