State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China.
Water Res. 2019 Nov 15;165:114975. doi: 10.1016/j.watres.2019.114975. Epub 2019 Aug 12.
Electrolysis and permanganate (PM) oxidation are two commonly used technologies for water treatment. However, they are often handicapped by their slow reaction rates. To improve the removal efficiency of refractory contaminants, we combined electrolysis with PM using an activated carbon fiber (ACF) as cathode (E-ACF-PM) for the first time to treat diclofenac (DCF) in aqueous solution. Up to 90% DCF was removed in 5 min by E-ACF-PM process. In comparison, only 3.95 and 27.35% of DCF was removed by individual electrolysis and PM oxidation at the same time, respectively. Acidic condition was more conducive to DCF removal. Surprisingly, soluble Mn(III) formed on the surface of ACF was demonstrated as the principal oxidizing agent in E-ACF-PM process. Further studies showed that all three components (electrolysis + ACF + PM) were necessary to facilitate the heterogeneous generation of reactive Mn(III) . Moreover, SEM images and XPS spectra of ACF before and after treatment revealed that the morphologies and elemental compositions of reacted ACF were nearly unchanged during the E-ACF-PM process. ACF can be remained active and utilized to the rapid degradation of DCF in E-ACF-PM process even after reused for 20 times. Therefore, the E-ACF-PM process may provide a novel and effective alternative on the generation of reactive Mn(III) in situ for water treatment by green electrochemical reactions.
电解和高锰酸盐（PM）氧化是两种常用于水处理的技术。然而，它们的反应速率往往较慢。为了提高难处理污染物的去除效率，我们首次将电解和 PM 结合起来，使用活性炭纤维（ACF）作为阴极（E-ACF-PM）处理水溶液中的双氯芬酸（DCF）。通过 E-ACF-PM 工艺，在 5 分钟内可去除高达 90%的 DCF。相比之下，单独的电解和 PM 氧化在相同条件下仅分别去除了 3.95%和 27.35%的 DCF。酸性条件更有利于 DCF 的去除。令人惊讶的是，在 ACF 表面形成的可溶性 Mn(III)被证明是 E-ACF-PM 工艺中的主要氧化剂。进一步的研究表明，在 E-ACF-PM 工艺中，需要所有三个组件（电解+ACF+PM）来促进反应性 Mn(III)的异相生成。此外，处理前后 ACF 的 SEM 图像和 XPS 谱表明，在 E-ACF-PM 工艺中，反应后的 ACF 的形态和元素组成几乎没有变化。即使在重复使用 20 次后，ACF 仍能保持活性，并在 E-ACF-PM 工艺中用于 DCF 的快速降解。因此，E-ACF-PM 工艺可能为通过绿色电化学反应原位生成反应性 Mn(III)提供一种新颖而有效的替代方法，用于水处理。
