The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
J Hazard Mater. 2020 Mar 5;385:121604. doi: 10.1016/j.jhazmat.2019.121604. Epub 2019 Nov 6.
Fenton reaction can disinfect bacteria and degrade organic pollutants via the generation of OH through the reaction of Fe(II) and HO However, its high efficiency only at very acidic conditions and the formation of Fe(III) sludge limit its practical application. Herein, magnetic FeO-deposited flower-like MoS (MF) composites were fabricated to disinfect Escherichia coli and degrade diclofenac (DCF) with addition of small amount of HO at a wide pH range (from 3.5 to 9.5). MF can efficiently inactivate bacteria and remove DCF at broad pH from 3.5 to 9.5. For example, 1.2 × 10 CFU mL cells are completely disinfected by MF in 30 min at pH 6 with 5 mM HO, while 10 mg L DCF is fully degraded in 7 min at pH 6 with 1 mM HO. MoS facilitates the conversion cycle of Fe(III)/Fe(II) and improves the generation of OH. MF can be easily collected by magnet after use. Confocal image, SEM images, the leakage of K and DNA were employed to determine the damage of cell membrane. Meanwhile, the theoretical density functional theory and the degradation intermediates determination were employed to provide the degradation pathway of DCF. MF exhibit excellent reusability and good catalytic performance towards sanitary sewage.
芬顿反应可以通过 Fe(II) 和 HO 的反应生成 OH 来消毒细菌和降解有机污染物。然而，其高效性仅在非常酸性的条件下实现，并且 Fe(III) 污泥的形成限制了其实际应用。在此，通过添加少量 HO 在较宽的 pH 范围（从 3.5 到 9.5）下，制备了磁性 FeO 沉积花状 MoS（MF）复合材料来消毒大肠杆菌并降解双氯芬酸（DCF）。MF 可以在从 3.5 到 9.5 的宽 pH 范围内有效灭活细菌和去除 DCF。例如，在 pH 6 下，用 5 mM HO 在 30 min 内可完全灭活 1.2×10 CFU mL 的细胞，而在 pH 6 下用 1 mM HO 在 7 min 内可完全降解 10 mg L 的 DCF。MoS 促进 Fe(III)/Fe(II)的转化循环，提高 OH 的生成。使用后，MF 可以通过磁铁轻松收集。共聚焦图像、SEM 图像和 K 和 DNA 的泄漏用于确定细胞膜的损伤。同时，理论密度泛函理论和降解中间体的确定用于提供 DCF 的降解途径。MF 对生活污水表现出良好的可重复使用性和良好的催化性能。
