To enhance the degradation of N, N-dimethylacetamide (DMAC) in aqueous solution, the natural mackinawite (NM) is introduced for catalytic ozonation in this study as it is an environmentally friendly catalyst with low cost and easy availability. The properties of the NM were initially characterized via scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Then, impact factors including NM dosage, ozone gas concentration and initial pH were investigated and the optimal conditions (i.e., NM dosage = 3.5 g/L, ozone gas concentration = 300 L/min, initial pH = 6.8) were obtained in NM/O3 process. Besides, the superiority of the NM/O₃ process was confirmed by the experiments that the degradation efficiency of DMAC in the NM/O₃ process (i.e., 95.4%) was much higher than that in the zero-valent iron (ZVI)/O₃ process (i.e., 46.1%) and the synthetic FeS/O₃ process (i.e., 68.6%). Furthermore, the intermediate and possible degradation pathway of DMAC were proposed, and the biological toxicity of the intermediate was subsequently evaluated by the activated sludge. Finally, the mechanism of the NM/O3 process was proposed in this study based on control experiment and radical scavenging experiment. The extraordinary efficiency for DMAC degradation was found to be mainly caused by HO^• of the reactive oxygen species (ROS) (i.e., HO^•, O₂^•- and H₂O₂) generated in the NM/O₃ process. Therefore, this study confirmed that NM was a high efficient catalyst for degradation the toxic and refractory pollutants in catalytic ozonation system.

为了促进水溶液中N，N-二甲基乙酰胺（DMAC）的降解，在本研究中引入了天然Mackinawite（NM）进行催化臭氧化，因为它是一种低成本且易于获得的环保催化剂。NM的特性最初是通过扫描电子显微镜（SEM），能量色散X射线光谱（EDS），X射线衍射（XRD），傅里叶变换红外光谱（FTIR）和X射线光电子光谱（XPS）来表征的。然后，研究了包括NM剂量，臭氧气体浓度和初始pH值在内的影响因素，并以NM / N获得了最佳条件（即NM剂量= 3.5 g / L，臭氧气体浓度= 300 L / min，初始pH = 6.8）。 O3过程。此外，NM / O ₃的优越性实验证实，DMAC在NM / O ₃工艺中的降解效率（即95.4％）比零价铁（ZVI）/ O ₃工艺中的降解效率（即46.1％）高得多。合成的FeS / O ₃工艺（即68.6％）。此外，提出了DMAC的中间体和可能的降解途径，随后通过活性污泥评估了中间体的生物毒性。最后，在控制实验和自由基清除实验的基础上，提出了NM / O3过程的机理。对于DMAC降解非凡效率被发现主要由HO ^•活性氧物质（ROS）（即，HO的^•，O- ₂^•和-H ₂ O ₂）在NM / O ₃过程中生成。因此，本研究证实NM是催化臭氧氧化系统中降解有毒和难处理污染物的高效催化剂。