College of Environmental Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China.
School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
J Colloid Interface Sci. 2022 Nov 15;626:283-295. doi: 10.1016/j.jcis.2022.06.138. Epub 2022 Jun 30.
Electrocatalytic filtration process adopting the electrocatalytic membrane as both filtration membrane and active electrode showed great prospect on the organic pollutant removal from water. In this work, a high-performance metal-free polypyrrole (PPy) coated carbon-based electrocatalytic membrane (PPy@CCM) was developed through the facile and controllable electro-polymerization deposition method. Structural properties and electrochemical performance of the prepared PPy@CCM were characterized systematically. The influences of preparation parameters and operational parameters on water treatment performance of PPy@CCM were also investigated. Results indicates that the spherical PPy particles uniformly distributed on the surface of PPy@CCM. Coating with PPy particles can significantly improve the hydrophilicity and electrochemical activity of CCM, therefore PPy@CCM has lower hydraulic resistance and higher water treatment performance than CCM. The phenol and chemical oxygen demand (COD) removal rates obtained by PPy@CCM are up to 99.51% and 89.90%, respectively, under the optimal condition of 2.0 V cell potential, 2.50 g·L NaSO, 1.5 ml·min flow rate and 50 mg·L phenol, and only 0.5 kWh·kgCOD energy consumption is consumed. In addition, PPy@CCM also exhibits good treatment performance in different water matrixes. Moreover, PPy@CCM has good stability for several cycle operation and considerable applicability for different types of organic pollutants removal. The oxidation mechanism study reveals that PPy@CCM has both direct and indirect oxidation activity during the electrocatalytic filtration treatment, and the coating of PPy can improve the direct oxidation ability and ·OH yield of CCM.
电催化过滤工艺采用电催化膜作为过滤膜和活性电极，在去除水中有机污染物方面具有广阔的前景。本工作通过简便可控的电化学聚合沉积法制备了高性能的无金属聚吡咯（PPy）负载碳基电催化膜（PPy@CCM）。系统地表征了所制备的 PPy@CCM 的结构性能和电化学性能。还研究了制备参数和操作参数对 PPy@CCM 水处理性能的影响。结果表明，PPy@CCM 表面均匀分布着球形 PPy 颗粒。PPy 颗粒的涂覆可以显著提高 CCM 的亲水性和电化学活性，因此 PPy@CCM 具有比 CCM 更低的水力阻力和更高的水处理性能。在 2.0 V 电池电位、2.50 g·L NaSO、1.5 ml·min 流速和 50 mg·L 苯酚的最佳条件下，PPy@CCM 对苯酚和化学需氧量（COD）的去除率分别高达 99.51%和 89.90%，仅消耗 0.5 kWh·kgCOD 能量。此外，PPy@CCM 在不同的水基质中也表现出良好的处理性能。此外，PPy@CCM 在几个循环运行中具有良好的稳定性，并且对不同类型的有机污染物去除具有相当的适用性。氧化机制研究表明，PPy@CCM 在电催化过滤处理过程中具有直接和间接氧化活性，PPy 的涂覆可以提高 CCM 的直接氧化能力和·OH 产量。
