Efficient degradation of lomefloxacin by Co-Cu-LDH activating peroxymonosulfate process: Optimization, dynamics, degradation pathway and mechanism
Efficient degradation of lomefloxacin by Co-Cu-LDH activating peroxymonosulfate process: Optimization, dynamics, degradation pathway and mechanism
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DOI：
10.1016/j.jhazmat.2020.122966
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发表时间：
2020-11-15
影响因子：
13.6
通讯作者：
Crittenden, John C.
中科院分区：
文献类型：
--
作者：
Guo, Ruonan;Zhu, Yiliang;Crittenden, John C.
采用共沉淀法合成了含碳酸盐夹层的CoxCuy-LDHs（CoxCuy-LDHs）。同时，制备相应的层状双氧化物（CoxCuy-LDO）作为对照。在本研究中，每一订单的电能被用来评估经济分析。相应地，我们发现CoxCuy-LDHs具有比相应的金属氧化物复合物（Co 3 O 4/CuO）显著更好的PMS活化能力。与其他Co（x）Cu（y）LDH相比，Co2 Cu 1 LDH具有最好的PMS活化能力和最低的反应过程中的每级电能（EE/O）值。此外，Co_2Cu_1 LDH表现出优异的稳定性，并在宽的pH范围内工作。Co（III）、Co（II）、Cu（I）和Cu（II）的氢氧化态均能活化PMS，表明Co2 Cu 1 LDH表面存在多个活性中心。通过清除剂实验和电子顺磁共振（EPR）确定了该反应体系中自由基的参与。同时，值得注意的是，一个数学模型被开发来量化的参与SO 4中心点-和中心点OH。在此基础上，确定了PMS/Co_2Cu_1 LDH体系的活化机理和LOM分解途径。
In this study, bimetal layered double hydroxides (CoxCuy-LDHs) containing a carbonate interlayer were synthesized using coprecipitation with a variety of Co/Cu mole ratios. Meanwhile, the corresponding layered double oxides (CoxCuy-LDOs) were prepared as controls. In this study, Electrical energy per order was performed to evaluate economic analysis. Correspondingly, we found that CoxCuy-LDHs possessed a significantly better PMS activation capability than the corresponding metal oxide composite (Co3O4/CuO). Compared with other Co(x)Cu(y)LDHs, Co2Cu1 LDH possessed the best PMS activation capability for LOM degradation and the lowest electrical energy per order (EE/O) value during the reaction. Additionally, Co2Cu1 LDH presented an excellent stability and worked over a wide pH range. The hydroxide states of Co(III), Co(II), Cu(I) and Cu(II) were all able to activate PMS, indicating that there were many active sites on the surface of Co2Cu1 LDH. The involvement of radicals in this reaction system was determined via scavenger experiments and electron paramagnetic resonance (EPR). Meanwhile, it's worth noting that a mathematical model was developed to quantify the involvement of SO4 center dot- and center dot OH. Subsequently, we determined PMS activation mechanism and LOM decomposition pathway for the PMS/Co2Cu1 LDH system.