Novel lignin-based single atom catalysts as peroxymonosulfate activator for pollutants degradation: Role of single cobalt and electron transfer pathway

被引:311
作者
Qi, Yuanfeng [1 ,3 ]
Li, Jing [1 ]
Zhang, Yanqing [1 ]
Cao, Qi [3 ]
Si, Yanmei [3 ]
Wu, Zhiren [3 ]
Akram, Muhammad [2 ,3 ]
Xu, Xing [2 ,3 ]
机构
[1] Qingdao Univ Technol, Sch Environm & Municipal Engn, Qingdao 266033, Peoples R China
[2] Shandong Univ, Sch Environm Sci & Technol, Qingdao 266237, Peoples R China
[3] Jiangsu ATK Environm Engn Co Ltd, Wuxi 214000, Jiangsu, Peoples R China
关键词
Single-atom; Cobalt; Naproxen; Peroxymonosulfate; Electron transfer; BISPHENOL-A; SELECTIVE DEGRADATION; AROMATIC CONTAMINANTS; ORGANIC CONTAMINANTS; CARBON NANOTUBES; NAPROXEN; REMOVAL;
D O I
10.1016/j.apcatb.2021.119910
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, a facile one-pot pyrolytic strategy was employed to fabricate a nitrogen coordinated Co single-atom catalyst (SA Co-N/C catalyst) by using lignin as carbon sources. The HAADF-STEM images and X-ray absorption spectra (XAS) analysis showed the isolated Co atoms less than 2 A throughout the entire SA Co-N/C architecture. Results showed that the single-atom Co sites served as the main active sites for naproxen (NPX) degradation via peroxymonosulfate (PMS) activation. This was confirmed by the high positive correlation (R-2 = 0.9675) between the rate constants and Co amounts in all SA Co-N/C catalysts. In particular, the as-prepared SA Co-N/C catalyst with a very small Co loading (2.45 wt.%) exhibited exceptional high turnover frequency (TOF) value for NPX (4.82 min(-1)), which is promising for the potential application prospect. Electron transfer was induced by the single-atom Co sites, which was the dominated mechanism for the NPX degradation.
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页数:11
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