Xing Chuanhong, Chen Kang, Hu Limin, Liu Lanhua
School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China.
Toxics. 2024 Oct 10;12(10):731. doi: 10.3390/toxics12100731.
Magnetic CuFeO was prepared with the modified sol-gel method and used for enhanced peroxymonosulfate (PMS) activation and ofloxacin (OFL) degradation. The OFL could almost degrade within 30 min at a catalyst dosage of 0.66 g/L, PMS concentration of 0.38 mM, and initial pH of 6.53 without adjustment, using response surface methodology (RSM) with Box-Behnken design (BBD). In the CuFeO/PMS system, the coexisting substances, including CO, NO, SO, Cl and humic acid, have little effect on the OFL degradation. The system also performs well in actual water, such as tap water and surface water (Mei Lake), indicating the excellent anti-interference ability of the system. The cyclic transformation between Cu(II)/Cu(I) and Fe(III)/Fe(II) triggers the generation of active radicals including SO, •OH, •O and O. The OFL degradation pathway, mainly involving the dehydrogenation, deamination, hydroxylation, decarboxylation and carboxylation processes, was proposed using mass spectroscopy. Moreover, the toxicity assessment indicated that the end intermediates are environmentally friendly. This study is about how the CuFeO/PMS system performs well in PMS activation for refractory organic matter removal in wastewater.
采用改进的溶胶 - 凝胶法制备了磁性CuFeO，并将其用于强化过一硫酸盐（PMS）活化及降解氧氟沙星（OFL）。使用Box - Behnken设计（BBD）的响应面方法（RSM），在催化剂用量为0.66 g/L、PMS浓度为0.38 mM且初始pH为6.53无需调节的条件下，OFL在30分钟内几乎可完全降解。在CuFeO/PMS体系中，共存物质，包括CO、NO、SO、Cl和腐殖酸，对OFL降解影响较小。该体系在实际水体如自来水和地表水（梅湖）中也表现良好，表明该体系具有出色的抗干扰能力。Cu(II)/Cu(I)与Fe(III)/Fe(II)之间的循环转化引发了包括SO、•OH、•O和O在内的活性自由基的产生。利用质谱法提出了主要涉及脱氢、脱氨、羟基化、脱羧和羧化过程的OFL降解途径。此外，毒性评估表明最终中间体对环境友好。本研究探讨了CuFeO/PMS体系在活化PMS以去除废水中难降解有机物方面的良好性能。
