锌盐添加对电凝聚法去除全氟辛酸（PFOA）的影响。
Effects of zinc salt addition on perfluorooctanoic acid (PFOA) removal by electrocoagulation with aluminum electrodes.
机构信息
Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 10673, Taiwan, ROC.
School of Public Health, Taipei Medical University, 250 Wu-Xing Street, Taipei, 11031, Taiwan, ROC.
出版信息
Chemosphere. 2022 Feb;288(Pt 3):132665. doi: 10.1016/j.chemosphere.2021.132665. Epub 2021 Oct 25.
In this study, the electrocoagulation (EC) of perfluorooctanoic acid (PFOA) by an aluminum electrode with the addition of zinc salt was investigated. Adding ZnCl successfully prevented a rise in pH during EC and increased the efficiency from 73.7% to over 99%. In addition, the longer the carbon chain of a PFA was, the better the removal of that PFA by electrocoagulation. The main functions of ZnCl were to prevent the rise in pH and improve flotation because the flocs with added ZnCl were easy to gather together and had a faster floating speed. The XPS results demonstrated the occurrence of bonding between aluminum and fluoride. This finding indicates that complexation between aluminum and fluoride may be the main mechanism for removal when aluminum electrodes are used to remove perfluoroalkyl (PFA) compounds.
在这项研究中，研究了在添加锌盐的情况下，铝电极对全氟辛酸（PFOA）的电化学混凝（EC）。添加 ZnCl 成功地防止了 EC 过程中 pH 值的上升，并将效率从 73.7%提高到 99%以上。此外，PFA 的碳链越长，电混凝对其的去除效果越好。ZnCl 的主要作用是防止 pH 值上升和提高浮选效果，因为添加 ZnCl 的絮体容易聚集在一起，并且具有更快的漂浮速度。XPS 结果表明，铝和氟之间发生了键合。这一发现表明，当使用铝电极去除全氟烷基（PFA）化合物时，铝和氟之间的络合可能是去除的主要机制。
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