Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Chemosphere. 2020 Jul;250:126177. doi: 10.1016/j.chemosphere.2020.126177. Epub 2020 Feb 17.
A novel superhydrophobic gas diffusion electrode based on carbon black (CB)- polytetrafluoroethylene (PTFE) modified graphite felt cathode was prepared to increase oxygen mass transfer efficiency and produce hydrogen peroxide at the gas-liquid-solid three-phase interface without aeration. The gas diffusion electrode system was further tested for the degradation of sulfamethazine (SMT) by electro-Fenton (EF) and photoelectro-Fenton (PEF). In the EF process, SMT was removed effectively, but the mineralization degree was not high due to the generation of organic acids which were difficult to be further degraded. While in the PEF process, organic contaminant can be destroyed by the combined action of Fe/HO, UV/HO and UV radiation, and more efficient mineralization (>83.5%) at low current (50 mA) was attained, which might be attributed to the high HO utilization (70-90%), rapid regeneration of Fe and photolysis of intermediates. In addition, it was verified that the PEF system had a good adaptability to pH and pollutant concentration. Compared with aeration system, the use of this active gas diffusion cathode in electrochemical advanced oxidation processes significantly reduced energy consumption.
一种新型基于炭黑（CB）-聚四氟乙烯（PTFE）改性石墨毡阴极的超疏水气体扩散电极被制备，以提高氧气传质效率，并在气-液-固三相界面上产生过氧化氢，而无需曝气。进一步测试了气体扩散电极系统用于电芬顿（EF）和光电芬顿（PEF）降解磺胺甲噁唑（SMT）的性能。在 EF 过程中，SMT 被有效去除，但由于生成了难以进一步降解的有机酸，矿化程度不高。而在 PEF 过程中，Fe/HO、UV/HO 和 UV 辐射的协同作用可以破坏有机污染物，在低电流（50 mA）下实现了更高的矿化效率（>83.5%），这可能归因于高 HO 利用率（70-90%）、Fe 的快速再生和中间产物的光解。此外，还验证了 PEF 系统对 pH 和污染物浓度具有良好的适应性。与曝气系统相比，在电化学高级氧化过程中使用这种活性气体扩散阴极可显著降低能耗。
