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首页> 外文期刊>Separation and Purification Technology >Degradation of levofloxacin in aqueous solution by non-thermal plasma combined with Ag3PO4/activated carbon fibers: Mechanism and degradation pathways
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Degradation of levofloxacin in aqueous solution by non-thermal plasma combined with Ag3PO4/activated carbon fibers: Mechanism and degradation pathways

机译：非热血浆与Ag3PO4 /活性炭纤维结合水溶液中左氧氟沙星的降解：机理和降解途径

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摘要

Degradation of quinolone antibiotic levofloxacin (LFX) in water falling film dielectric barrier discharge (DBD) plasma combined with Ag3PO4 loaded activated carbon fibers (Ag3PO4/ACFs) system was studied. The prepared Ag3PO4/ACFs were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). The results showed that the cubic Ag3PO4 was well loaded on surface of the ACFs with a large specific surface area. Effects of initial concentration of LFX, discharge voltage, initial pH, liquid circulation flow rate, and catalyst dosage on the removal rate of LFX were discussed. The results showed that the degradation efficiency of LFX at 18 min could reach 93% with the addition of Ag3PO4/ACFs compared with 63% by single DBD plasma (discharge voltage 10 kV, initial concentration of LFX 20 mg/L). The addition of Ag3PO4/ACFs increased the mineralization rate of LFX from 11% to 46%. The possible degradation pathways of LFX were derived by Gaussian calculation and high-performance liquid chromatography-mass spectrometry (HPLC-MS) analysis, decarboxylation, demethylation, dehydroxylation, side chain decomposition, and ring cleavage involved in the degradation process of LFX.
机译：研究了喹诺酮抗生素左氧氟沙星（LFX）在水下降薄膜介电阻挡排放（DBD）血浆与Ag3PO4加载的活性炭纤维（Ag3PO4 / ACF）系统结合的降解。通过扫描电子显微镜（SEM），X射线衍射（XRD）和Brunauer-Emmett-Teller（Bet），表征制备的Ag3PO4 / ACF。结果表明，立方体Ag3PO4在具有大的比表面积的ACF的表面上良好地装载。探讨了LFX，放电电压，初始pH，液体循环流速和催化剂剂量对LFX的去除率的初始浓度的影响。结果表明，18分钟的LFX的降解效率可达到93％，加入Ag3PO4 / ACF与63％的单一DBD等离子体（放电电压10kV，LFX 20mg / L的初始浓度）相比。 Ag3PO4 / ACF的添加增加了LFX的矿化速率从11％到46％。通过高斯计算和高效液相色谱 - 质谱（HPLC-MS）分析，脱羧，去甲基化，脱羟基化，侧链分解和参与LFX的降解过程中涉及的LFX的可能降解途径。

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