Collaborative Innovation Center for Vessel Pollution Monitoring and Control, Dalian Maritime University, Dalian 116026, China E-mail:
College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, China.
Water Sci Technol. 2021 Nov;84(9):2278-2287. doi: 10.2166/wst.2021.421.
Ti-based electrode coated with MnO catalytic layer has presented superior electrochemical activity for degradation of organic pollution in wastewater, however, the industrial application of Ti-based MnO electrode is limited by the poor stability of the electrode. In this study, the novel Ti-based MnO electrodes co-incorporated with rare earth (Ce) and conductive carbon black (C) were prepared by spraying-calcination method. The Ti/Ce:MnO-C electrode, with uniform and integrated surface and enhanced Mn(IV) content by C and Ce co-incorporation, could completely remove ammonia nitrogen (NH-N) with N as the main product. The cell potential and energy consumption of Ti/Ce:MnO-C electrode during the electrochemical process was significantly reduced compared with Ti/MnO electrode, which mainly originated from the enhanced electrochemical activity and reduced charge transfer resistance by Ce and C co-incorporation. The accelerated lifetime tests in sulfuric acid showed that the actual service lifetime of Ti/Ce:MnO-C was ca. 25 times that of Ti/MnO, which demonstrated the significantly promoted stability of MnO-based electrode by Ce and C co-incorporation.
钛基电极涂覆 MnO 催化层具有优异的电化学活性，可用于降解废水中的有机污染物，但钛基 MnO 电极的工业应用受到电极稳定性差的限制。本研究采用喷涂-煅烧法制备了新型共掺杂铈和导电炭黑的钛基 MnO 电极 Ti/Ce:MnO-C。Ti/Ce:MnO-C 电极表面均匀且一体化，由于 C 和 Ce 的共掺杂提高了 Mn(IV)的含量，可以完全以 N 作为主要产物去除氨氮（NH-N）。与 Ti/MnO 电极相比，Ti/Ce:MnO-C 电极在电化学过程中的电池电势和能耗显著降低，这主要源于 Ce 和 C 的共掺杂提高了电化学活性并降低了电荷转移电阻。在硫酸中的加速寿命测试表明，Ti/Ce:MnO-C 的实际使用寿命约为 Ti/MnO 的 25 倍，这表明 Ce 和 C 的共掺杂显著提高了 MnO 基电极的稳定性。
