Department of Environmental Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
Department of Environmental Health Engineering, Tehran University of Medical Sciences, Health Assistant Department, South Tehran Health Center, Tehran, Iran.
Chemosphere. 2021 Jul;274:129772. doi: 10.1016/j.chemosphere.2021.129772. Epub 2021 Jan 28.
In this work, nanopyrite particles (NP) were synthesized by ball mill method and used as a novel source of Fe in the electro-activation of ozone and peroxydisulfate (PDS) for ofloxacin (OFX) removal. Fourier transform infrared spectroscopy, X-ray powder diffraction, field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy analyzes were performed to characterize the as-made NP. Optimal values of operating parameters in NP/PDS and NP/O processes were obtained. The OFX (10 mgL) removal efficiency and molar ratio of OFX: oxidant in NP/PDS and NP/Oprocesses were 92%, 0.1:11 and 89%, 0.1:9, respectively. Although the synergistic effect was observed in both systems, it was more significant in the NP/PDS. The results of free radical tracing showed that HOand SO had the more contribution in NP/O and NP/PDS systems for OFX degradation, respectively. In this way, the OFX removal mechanism was the effective release of Fe from the NP in the electro-activation of O and PDS. Moreover, the effect of electrocoagulation process on OFX removal was negligible. The as-made NP overcame the disadvantages of iron electrode corrosion and iron sludge production in the Fe-based classical electro-activation processes. Overall, the performance of the synthesized NP in the OFX oxidation was very successful in terms of sustainability, Fedistribution, removal efficiency, energy consumption and PDS or O activation.
在这项工作中，通过球磨法合成了纳米黄铁矿（NP）颗粒，并将其用作电激活臭氧和过二硫酸盐（PDS）去除水中氟氧氟沙星（OFX）的新型铁源。采用傅里叶变换红外光谱、X 射线粉末衍射、场发射扫描电子显微镜和能谱分析对所制得的 NP 进行了表征。得到了 NP/PDS 和 NP/O 过程中最佳操作参数的数值。在 NP/PDS 和 NP/O 过程中，10mg/L 的 OFX 的去除效率和 OFX:氧化剂的摩尔比分别为 92%、0.1:11 和 89%、0.1:9。虽然在这两个系统中都观察到了协同效应，但在 NP/PDS 中更为显著。自由基追踪结果表明，HO 和 SO 在 NP/O 和 NP/PDS 体系中对 OFX 降解的贡献更大。这样，OFX 的去除机制是通过电激活 O 和 PDS 从 NP 中有效释放出 Fe。此外，电絮凝过程对 OFX 去除的影响可以忽略不计。与 Fe 基经典电激活过程中存在的铁电极腐蚀和铁污泥生成的缺点相比，所制备的 NP 克服了这些问题。总的来说，所合成的 NP 在 OFX 氧化方面的性能在可持续性、Fed 分布、去除效率、能耗和 PDS 或 O 激活方面都非常成功。
