Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China.
Dqchance. Science and Technology co Ltd, Hangzhou 310058, China.
Water Res. 2023 Nov 1;246:120674. doi: 10.1016/j.watres.2023.120674. Epub 2023 Oct 7.
Electrified membrane technologies have recently demonstrated high potential in tackling water pollution, yet their practical applications are challenged by relying on large precursor doses. Here, we developed a Janus porous membrane (JPEM) with synergic direct oxidation by Magnéli phase TiO anode and electro-Fenton reactions by CuFeO cathode. Organic pollutants were first directly oxidized on the TiO anode, where the extracted electrons from pollutants were transported to the cathode for electro-Fenton production of hydroxyl radical (·OH). The cathodic ·OH further enhanced the mineralization of organic pollutant degradation intermediates. With the sequential anodic and cathodic oxidation processes, the reagent-free JPEM showed competitive performance in rapid degradation (removal rate of 0.417 mg L s) and mineralization (68.7 % decrease in TOC) of sulfamethoxazole. The JPEM system displayed general performance to remove phenol, carbamazepine, and perfluorooctanoic acid. The JPEM runs solely on electricity and oxygen that is comparable to that of PEM relies on large precursor doses and, therefore, operation friendly and environmental sustainability. The high pollutant removal and mineralization achieved by rational design of the reaction processes sheds light on a new approach for constructing an efficient electrified membrane.
电化学生物膜技术在处理水污染方面具有很大的潜力，但是其实际应用受到了需要大量前体剂量的限制。在这里，我们开发了一种具有协同直接氧化作用的 Janus 多孔膜（JPEM），其协同直接氧化作用由 Magnéli 相 TiO 阳极的直接氧化和 CuFeO 阴极的电芬顿反应提供。有机污染物首先在 TiO 阳极上被直接氧化，污染物中提取的电子被输送到阴极以产生·OH。阴极·OH 进一步增强了有机污染物降解中间产物的矿化作用。通过顺序的阳极和阴极氧化过程，无试剂的 JPEM 表现出快速降解（磺胺甲恶唑的去除率为 0.417 mg L s）和矿化（TOC 降低 68.7%）的竞争性能。JPEM 系统对苯酚、卡马西平、全氟辛酸的去除也表现出一般性能。JPEM 仅依靠电力和氧气运行，这与需要大量前体剂量的质子交换膜（PEM）相比，具有操作友好和环境可持续性的优点。通过合理设计反应过程实现了高污染物去除率和矿化率，为构建高效电化学生物膜提供了一种新方法。
