过氧二硫酸盐
四溴双酚A
降级(电信)
催化作用
电子顺磁共振
电子转移
化学
吸附
Atom(片上系统)
拉曼光谱
无机化学
物理化学
光化学
有机化学
核磁共振
物理
阻燃剂
嵌入式系统
光学
电信
计算机科学
作者
Qi Wang,Dongmei Zhou,Cun Liu,Xiurong Chen,Lili Liu,Kuangfei Lin
标识
DOI:10.1016/j.cej.2022.140681
摘要
Increasing the metal atom loading on single-atom catalysts may not improve their activation performance on peroxydisulfate (PDS). In this study, dual-atom catalysts (Fe0.4Cu0.6NC) were synthesized using a one-pot method: Fe and Cu atoms were uniformly dispersed as dual Fe–Cu atom pairs in a nitrogen-doped graphitic carbon support. Fe0.4Cu0.6NC exhibited an excellent degradation efficiency (98.7 %) and rate (0.060 min−1) for tetrabromobisphenol S (TBBPS, 5 mg/L) within 60 min of treatment under optimized conditions. In-situ Raman spectroscopy, electrochemical analyses, and electron paramagnetic resonance tests revealed that electron transfer was the main degradation pathway for TBBPS. Density functional theory calculations demonstrated that the synergism between Fe and Cu atoms enhanced the adsorption of PDS and the dual Fe–Cu sites served as the active centers during PDS activation. Additionally, the TBBPS degradation pathways were investigated, and most of the TBBPS intermediates were considered innocuous. These findings give weight to the enhanced effect of the synergism of dual Fe–Cu sites on PDS activation, providing an innovative system for pollutant degradation through electron-transfer pathways.
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