过氧化氢
气体扩散电极
电极
化学
电化学
氧气
扩散
阴极
降级(电信)
化学工程
曝气
材料科学
计算机科学
有机化学
工程类
物理
热力学
物理化学
电信
作者
Yanshi Zheng,Junguo He,Shan Qiu,Dehai Yu,Yingshi Zhu,Heliang Pang,Jie Zhang
标识
DOI:10.1016/j.apcatb.2022.121617
摘要
Electro-Fenton (EF) is a promising electrochemical technology in degrading recalcitrant organic pollutants. However, the technology faces problems of high energy consumption, low cathodic oxygen transfer rate and low H2O2 production efficiency. Therefore, a novel air-breathing gas diffusion electrode (GDE) with multiform hydrophobic layers was prepared by a facile method. The novel GDE allows the air to diffuse to the triphase interface spontaneously, eliminating the cost of aeration. Also, the multiform hydrophobic layers can greatly improve the oxygen transfer rate and expand the triphase interfaces in the GDE, resulting in a high H2O2 accumulation of 44.30 mg L−1 cm−2 h−1 without aeration, which was 18 times higher than that of the virgin cathode. A 100% degradation efficiency of sulfadiazine (SDZ) was achieved with the fabricated GDE in 10 min in EF system. Moreover, theoretical calculations were performed for accurately elucidating the SDZ degradation mechanism and pathway.
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