Herein, degradation of ofloxacin (OFX) by pulsed discharge plasma (PDP) coupled with multi-catalysis using graphene-Fe₃O₄ nanocomposites was inspected. The graphene-Fe₃O₄ nanocomposites were prepared by hydrothermal synthesis, and their morphology, specific surface area, chemical bond structure and magnetic property were characterized systematically. Compared with sole Fe₃O₄, the specific surface area of graphene-Fe₃O₄ nanocomposites increased from 26.34 m²/g to 125.04 m²/g. The prepared graphene-Fe₃O₄ nanocomposites had higher paramagnetism and the magnetic strength reached 66.05 emu/g, which was prone to separate from solution. Graphene-Fe₃O₄ nanocomposites could further accelerate OFX degradation compared to sole Fe₃O₄. When graphene content was 18wt%, graphene-Fe₃O₄ nanocomposites exhibited the highest catalytic activity, and the removal efficiency of OFX enhanced from 65.0% (PDP alone) to 99.9%. 0.23 g/L dosage and acid solution were beneficial for OFX degradation. Higher stability of graphene-Fe₃O₄ nanocomposites could be maintained although four times use. Graphene-Fe₃O₄ nanocomposites could catalyze H₂O₂ and O₃ to produce more ·OH. The degradation products of OFX were identified by liquid chromatography mass spectrometry (LC-MS) and ion chromatography (IC). According to the identified products and discrete Fourier transform (DFT), the degradation pathway was inferred. Further toxicity assessment of products manifested that the toxicity of oral rat 50% lethal dose (LD₅₀) and the developmental toxicity of OFX were reduced.

在本文中，检查了氧氟沙星（OFX）被脉冲放电等离子体（PDP）降解以及石墨烯-Fe ₃ O ₄纳米复合材料的多重催化作用。通过水热合成制备了石墨烯-Fe ₃ O ₄纳米复合材料，并对其形貌，比表面积，化学键结构和磁性能进行了表征。与单一的Fe ₃ O ₄相比，石墨烯-Fe ₃ O ₄纳米复合材料的比表面积从26.34 m ² / g增加至125.04 m ² / g。制备的石墨烯-Fe ₃ O ₄纳米复合材料具有较高的顺磁性，磁性强度达到66.05 emu / g，极易与溶液分离。与唯一的Fe ₃ O ₄相比，石墨烯-Fe ₃ O ₄纳米复合材料可以进一步加速OFX降解。当石墨烯含量为18wt％时，石墨烯-Fe ₃ O ₄纳米复合材料表现出最高的催化活性，并且OFX的去除效率从65.0％（仅PDP）提高到99.9％。0.23 g / L的剂量和酸性溶液有利于OFX降解。尽管使用了四次，但石墨烯-Fe ₃ O ₄纳米复合材料仍可以保持较高的稳定性。石墨烯-Fe ₃ O ₄纳米复合材料可以催化H ₂ O ₂和O ₃产生更多的·OH。通过液相色谱质谱（LC-MS）和离子色谱（IC）鉴定OFX的降解产物。根据鉴定出的产物和离散傅里叶变换（DFT），推断降解途径。产品的进一步毒性评估表明，口服大鼠50％致死剂量（LD ₅₀）的毒性和OFX的发育毒性均降低。