Nanoscaled magnetic CuFe2O4 as an activator of peroxymonosulfate for the degradation of antibiotics norfloxacin
Nanoscaled magnetic CuFe2O4 as an activator of peroxymonosulfate for the degradation of antibiotics norfloxacin
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纳米磁性 CuFe2O4 作为过一硫酸盐活化剂用于降解抗生素诺氟沙星
DOI：
10.1016/j.seppur.2018.11.051
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发表时间：
2019-04
影响因子：
8.6
通讯作者：
Lu Xinwei
中科院分区：
文献类型：
--
作者：
Wang Yuru;Tian Dongfan;Chu Wei;Li Minrui;Lu Xinwei
采用共沉淀-煅烧法合成了磁性可分离的纳米CuFe 2 O 4，并将其作为非均相催化剂活化过一硫酸根（PMS）生成强氧化性硫酸根自由基（SO 4 radical dot−）.研究了CuFe 2 O 4/PMS体系对水中氟喹诺酮类抗生素诺氟沙星（NOR）的降解。实验参数，包括初始pH值，氧化剂和NOR浓度，催化剂剂量，和水基质上NOR去除的效果进行了系统的研究。无机离子的演化（例如，NO3-、F-和NH 4+）和低分子量有机酸（例如，甲酸、乳酸、乙酸和草酸）。实验结果表明，NOR的降解符合准一级反应动力学。在pH = 7时，使用200 mg L− 1CuFe 2 O 4活化0.5 mM PMS，在120 min内可去除90%以上的25 μM NOR。自由基猝灭实验表明，在CuFe 2 O 4/PMS体系中，SO 4自由基dot−在NOR氧化过程中起主导作用。TOC测试表明，>64%的初始碳含量在12 h内被去除，同时观察到羧酸的增加，并在12 h内贡献了初始碳含量的32.9%，这表明它们是完全矿化之前的主要终产物。对反应前后催化剂的XRD图谱进行了表征。结果表明，催化剂的结构和性能保持稳定，回收后的催化剂在重复使用试验中表现出良好的性能。因此，CuFe 2 O 4/PMS是一种很有前途的替代物，可用于处理诺氟沙星类抗生素污染的水体。
In this study, a magnetically separable nanoscale CuFe2O4synthesized by co-precipitation-calcination method was employed as a heterogeneous catalyst to activate peroxymonosulfate (PMS) for the generation of powerful oxidizing sulfate radical (SO4radical dot−). The degradation of the fluoroquinolone antibiotics norfloxacin (NOR) in aqueous solution by CuFe2O4/PMS system was examined. The effect of experimental parameters, including initial pH, oxidant and NOR concentrations, catalyst dose, and water matrices on NOR removal was systematically investigated. The evolution of inorganic ions (e.g., NO3−, F−, and NH4+) and low molecular weight organic acids (e.g., formic acid, lactic acid, acetic acid, and oxalic acid) during NOR degradation was monitored by using ion chromatography. Experimental results showed that NOR degradation was in accordance with the pseudo first-order reaction kinetics. At pH = 7, more than 90% of 25 μM NOR was removed in 120 min by using 200 mg L−1CuFe2O4to activate 0.5 mM PMS. Free radical quenching experiments revealed the dominant role of SO4radical dot−in oxidizing NOR in CuFe2O4/PMS system. TOC test indicated that >64% of initial carbon content was removed in 12 h; meanwhile an increasing buildup of carboxylic acids was observed and contributed to 32.9% of initial carbon content in 12 h, suggesting that they were the predominant end products before completely mineralization. The XRD profile of the catalyst before and after the reaction was characterized. It was found that the structure and properties of the catalyst kept stable, and the recovered catalyst exhibited good performance during the reusability test. The result therefore suggested that CuFe2O4/PMS is a promising alternative as a possible application for treatment of water polluted by norfloxacin antibiotics.
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通讯作者：
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