State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Water Res. 2022 Jun 1;216:118322. doi: 10.1016/j.watres.2022.118322. Epub 2022 Mar 19.
Peracetic acid (PAA)-based advanced oxidation processes (AOPs) has attracted increasing attentions towards contaminant degradation in the wastewater treatment. Herein, we report the efficient activation of PAA by nano-CuO (nCuO/PAA) to degrade carbamazepine (CBZ) for the first time. Rapid degradation of CBZ was observed in the nCuO/PAA system at neutral initial pH. A new scavenging experiment with Mn as a specific scavenger was developed to distinguish the dominant role of CHC(O)OO for CBZ degradation in the nCuO/PAA process. The oxidation of CBZ by CHC(O)OO was verified to proceed via the electrons transfer, and the acute and chronic toxicity of the transformation products was significantly reduced. The efficient activation of PAA by nCuO was found to be realized through continuous conversion of Cu(II) to Cu(I), which was significantly boosted by co-existing HO. The nCuO/PAA process was slightly affected by the water matrices, and maintained high efficiency in real water samples. The findings obtained in this study provide new insights into the catalytic formation of CHC(O)OO from PAA and facilitate the development and application of PAA-based AOPs in wastewater treatment.
过氧乙酸（PAA）基高级氧化工艺（AOPs）在废水处理中对污染物降解的研究受到了越来越多的关注。本文首次报道了纳米氧化铜（nCuO/PAA）高效活化过氧乙酸（PAA）降解卡马西平（CBZ）。在中性初始 pH 值条件下，nCuO/PAA 体系中 CBZ 迅速降解。通过 Mn 作为特定清除剂的新的清除实验，区分了在 nCuO/PAA 过程中 CHC(O)OO 对 CBZ 降解的主导作用。通过电子转移验证了 CHC(O)OO 对 CBZ 的氧化作用，并且转化产物的急性和慢性毒性显著降低。发现 nCuO 可通过连续将 Cu(II)转化为 Cu(I)来高效活化 PAA，而共存的 HO 会显著促进这一过程。nCuO/PAA 工艺受水基质的影响较小，在实际水样中仍保持高效。本研究结果为 PAA 催化生成 CHC(O)OO 提供了新的见解，有助于 PAA 基 AOPs 在废水处理中的开发和应用。
