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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >One-step solvothermal synthesis of magnetic Fe3O4-graphite composite for Fenton-like degradation of levofloxacin
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One-step solvothermal synthesis of magnetic Fe3O4-graphite composite for Fenton-like degradation of levofloxacin

机译：一步法溶剂热合成磁性Fe3O4-石墨复合物用于Fenton样降解左氧氟沙星

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摘要

A novel Fe3O4-graphite composite was prepared, characterized, and investigated as a heterogeneous Fenton-like catalyst for the degradation of levofloxacin (LEV) in an aqueous solution. The results revealed that the Fe3O4-graphite composite exhibited excellent properties for the degradation and mineralization of LEV, achieving a nearly complete degradation of 50 mg L-1 LEV in 15 min and 48% of total organic carbon removal in 60 min under optimal conditions. A large electronic conjugation structure exists in graphite, which may lead to the fast production of center dot OH radical species because of the easy reduction of Fe(III) to Fe(II). In addition, we observed that the graphite can degrade LEV in the presence of H2O2. Therefore, the synergistic results of the graphite structure and Fe3O4 magnetic nanoparticles (MNPs) may contribute to the high catalytic activity of the Fe3O4-graphite composite. Compared with pure Fe3O4 MNPs, lesser iron leaching of the Fe3O4-graphite composite was observed during the degradation of LEV. The degradation efficiency of LEV remained approximately 80% at the fifth recycling run, which indicates that the Fe3O4-graphite composite has potential applications in water treatment for removing organic pollutants.
机译：制备，表征和研究了新型Fe3O4-石墨复合材料，作为非均相类Fenton催化剂用于水溶液中左氧氟沙星（LEV）的降解。结果表明，Fe3O4-石墨复合材料对LEV的降解和矿化具有优异的性能，在最佳条件下15分钟内50 mg L-1 LEV几乎完全降解，在60 min内总有机碳去除量达到48％。石墨中存在大的电子共轭结构，由于容易将Fe（III）还原为Fe（II），因此可以快速生成中心点OH自由基物种。此外，我们观察到在H2O2存在下，石墨可以降解LEV。因此，石墨结构和Fe3O4磁性纳米颗粒（MNPs）的协同作用可能有助于Fe3O4-石墨复合材料的高催化活性。与纯Fe3O4 MNP相比，在LEV降解过程中观察到Fe3O4-石墨复合材料的铁浸出较少。在第五次循环运行中，LEV的降解效率保持在80％左右，这表明Fe3O4-石墨复合材料在水处理中去除有机污染物方面具有潜在的应用前景。

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