Guijuan Li, Yan Cheng, Mengyao Jing, Dan Zhang, Yufei Ma, Shengke Yang
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The redox potential of the MNBs/NaClO system exhibited significantly superior properties than the single system, with bubble sizes predominantly in the nanoscale. The degradation kinetics of NOR adhered to a pseudo-first-order reaction model, with optimal degradation occurring at a 0.025% NaClO volume concentration. Acidic conditions promoted the degradation of NOR, and alkaline conditions inhibited the degradation of NOR. Inorganic anions PO<sub>4</sub><sup>3-</sup>, HCO<sub>3</sub><sup>-</sup>, and CO<sub>3</sub><sup>2-</sup> in the water matrix led to strong inhibition of NOR degradation. Cationic surfactants accelerated the degradation process of NOR, while anionic and nonionic surfactants had a consistent inhibitory effect on the degradation of NOR. Based on the degradation behavior, three potential pathways for NOR degradation were proposed: quinolone group transformation, defluorination reaction, piperazine ring cracking and quinolone ring decomposition. 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引用次数: 0
摘要
本研究深入研究了诺氟沙星(NOR)在微纳米气泡(MNBs)和次氯酸钠(NaClO)影响下的降解过程,重点关注它们之间的协同效应。系统评估了各种环境因素(包括 NaClO 浓度、pH 值、无机阴离子和表面活性剂)对 MNBs/NaClO 系统中 NOR 降解效率的影响。探讨了 MNBs/NaClO 系统的基本特性和 NOR 的降解动力学。利用密度泛函理论(DFT)和高效液相色谱-质谱联用技术(HPLC-MS),探索了 NOR 的降解产物和降解途径,从而揭示了抗生素在 MNBs/NaClO 体系中的降解机理。与单一体系相比,MNBs/NaClO 体系的氧化还原电位表现出明显的优越性,气泡尺寸主要在纳米级。NOR 的降解动力学遵循伪一阶反应模型,最佳降解发生在 NaClO 体积浓度为 0.025% 时。酸性条件促进 NOR 的降解,碱性条件抑制 NOR 的降解。水基质中的无机阴离子 PO43-、HCO3- 和 CO32- 强烈抑制了 NOR 的降解。阳离子表面活性剂加速了 NOR 的降解过程,而阴离子和非离子表面活性剂对 NOR 的降解具有一致的抑制作用。根据降解行为,提出了 NOR 降解的三种潜在途径:喹诺酮基团转化、脱氟反应、哌嗪环裂解和喹诺酮环分解。这项研究为解决抗生素污染问题提供了一种新的技术方法,并为了解抗生素在环境中的归宿提供了一个理论框架。
Degradation of norfloxacin by the synergistic effect of micro-nano bubbles and sodium hypochlorite: kinetics, influencing factors and pathways.
This study thoroughly investigated the degradation of norfloxacin (NOR) under the influence of micro-nanobubbles (MNBs) and sodium hypochlorite (NaClO), focusing on their synergistic effects. The impact of various environmental factors, including NaClO concentration, pH, inorganic anions, and surfactants, on NOR degradation efficiency within the MNBs/NaClO system was systematically assessed. The basic properties of the MNBs/NaClO system and the degradation kinetics of NOR were explored. The degradation products and pathways of NOR were explored to reveal the degradation mechanism of antibiotics in the MNBs/NaClO system by employing density functional theory (DFT) and high-performance liquid chromatography-mass spectrometry (HPLC-MS). The redox potential of the MNBs/NaClO system exhibited significantly superior properties than the single system, with bubble sizes predominantly in the nanoscale. The degradation kinetics of NOR adhered to a pseudo-first-order reaction model, with optimal degradation occurring at a 0.025% NaClO volume concentration. Acidic conditions promoted the degradation of NOR, and alkaline conditions inhibited the degradation of NOR. Inorganic anions PO43-, HCO3-, and CO32- in the water matrix led to strong inhibition of NOR degradation. Cationic surfactants accelerated the degradation process of NOR, while anionic and nonionic surfactants had a consistent inhibitory effect on the degradation of NOR. Based on the degradation behavior, three potential pathways for NOR degradation were proposed: quinolone group transformation, defluorination reaction, piperazine ring cracking and quinolone ring decomposition. This research contributes a novel technical approach for addressing antibiotic pollution and offers a theoretical framework for understanding the fate of antibiotics in the environment.
期刊介绍:
Environmental Science: Processes & Impacts publishes high quality papers in all areas of the environmental chemical sciences, including chemistry of the air, water, soil and sediment. We welcome studies on the environmental fate and effects of anthropogenic and naturally occurring contaminants, both chemical and microbiological, as well as related natural element cycling processes.