化学
激进的
超氧化物
氧气
光化学
电化学
活性氧
降级(电信)
猝灭(荧光)
电子顺磁共振
金属
电子转移
电极
无机化学
有机化学
荧光
电信
生物化学
物理
物理化学
量子力学
核磁共振
计算机科学
酶
作者
Yiyin Peng,Zhaoyong Bian,Feng Wang,Shun‐Lin Li,Shiwei Xu,Hui Wang
标识
DOI:10.1016/j.jhazmat.2023.132797
摘要
Although metal-free electrodes in molecular oxygen-activated Fenton-like wastewater treatment technologies have been developed, the reactive oxygen species (ROS) generation mechanisms are still not sufficiently clear. As a typical example of refractory phenolic wastewater, p-nitrophenol (PNP) has been widely studied. This study demonstrated the critical role of superoxide radicals (O2•-) in PNP degradation by metal-free electrodes through electron spin resonance (ESR), ROS quenching, and density functional theory (DFT) tests. The most superior metal-free electrode exhibited a mass activity of approximately 133.5 h-1 gcatalyst-1. Experimental and theoretical studies revealed the mechanism of O2•- generation via oxygen activation, including one- and three-electron transfer pathways, and found that O2•- mainly attacked the nitro group of PNP to degrade and transform the pollutant. This study enhances the mechanistic understanding of metal-free materials in the electrochemical degradation of refractory pollutants.
科研通智能强力驱动
Strongly Powered by AbleSci AI