Energy-saving photo-degradation of three fluoroquinolone antibiotics under VUV/UV irradiation: Kinetics, mechanism, and antibacterial activity reduction
Energy-saving photo-degradation of three fluoroquinolone antibiotics under VUV/UV irradiation: Kinetics, mechanism, and antibacterial activity reduction
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VUV/UV 照射下三种氟喹诺酮类抗生素的节能光降解：动力学、机制和抗菌活性降低
DOI：
10.1016/j.cej.2019.123145
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发表时间：
2020-03-01
影响因子：
15.1
通讯作者：
Wang, Chuang
中科院分区：
文献类型：
--
作者：
Geng, Cong;Liang, Zhijie;Wang, Chuang
由于污水处理厂的生物和紫外线消毒工艺处理效率低下，世界各地的水环境中经常检测到广谱氟喹诺酮类抗生素（FQ）。在这项工作中，研究了 VUV/UV 照射下三种 FQ（诺氟沙星-NOR、环丙沙星-CIP、左氧氟沙星-LEV）的光降解情况。结果表明，VUV/UV辐照体系中FQs的降解效果比UV辐照体系更有效，增强了脱氟和脱羧作用。高温和低初始浓度可以更有效地降解FQs，且流速的影响较小。初始 pH 在 NOR 和 CIP 的降解中起着关键作用。除碳酸盐和磷酸盐外，大多数阴离子都会轻微影响水中 FQ 的去除。 O-1(2) 和中心点 OH 在 VUV/UV 系统中 FQ 降解中起主要作用。脱氟、脱羧和哌嗪环氧化是三种FQs降解的主要降解途径，但去甲基化是LEV的特殊降解途径。 FQs 水样的抗菌活性在 VUV/UV 和 UV 系统中均有所降低，而对于 NOR 和 LEV，VUV/UV 过程中的抗菌活性去除效果比 UV 过程更有效。 VUV/UV系统对于去除FQs更加节能。这些结果表明，VUV/UV 系统是未来替代或增强废水处理厂中用于去除 FQ 的 UV 系统的潜在替代方案。
Due to the inefficient treatment by the biotic and UV-disinfection processes in wastewater treatment plants, the broad-spectrum Fluoroquinolone antibiotics (FQs) are frequently detected in water environment around the world. In this work, the photo-degradation of three FQs (norfloxacin-NOR, ciprofloxacin-CIP, levofloxacin-LEV) by VUV/UV irradiation was investigated. The results showed that the degradation of FQs in VUV/UV irradiation system were more effective than that in UV irradiation system by enhanced the defluorination and decarboxylation. FQs could be degraded more efficiently with high temperature and low initial concentration, and the effect of flow rate was small. Initial pH played a key role in degradation of NOR and CIP. Most anions could slightly affect the FQs removal in water, except the carbonate and phosphate species. O-1(2) and center dot OH played the primary role in FQs degradation in VUV/UV system. Defluorination, decarboxylation, and piperazine ring oxidation were the main degradation pathways for three FQs degradation, but demethylation was a particular degradation pathway of LEV. Antibacterial activities of FQs aqueous sample were reduced in both VUV/UV and UV system, while the removal of antibacterial activities in the VUV/UV process were more efficient than UV process for NOR and LEV. VUV/UV system was more energy-saving for removing FQs. These results suggested that VUV/UV system is potential alternative in replacing or enhancing UV system in wastewater treatment plants for FQs removal in the future.