钴
催化作用
化学
热解
维生素B12
氮化物
石墨氮化碳
无机化学
污染物
材料科学
环境化学
化学工程
纳米技术
有机化学
光催化
生物化学
工程类
图层(电子)
作者
Shizong Wang,Jianlong Wang
标识
DOI:10.1016/j.apcatb.2022.122051
摘要
This study prepared the carbon-supported cobalt catalyst (Co-C-X) for activating peroxymonosulfate (PMS), and investigated the effect of co-pyrolysis temperature of graphitic carbon nitride (g-C 3 N 4 ) and vitamin B 12 on the catalytic activity. It was found that with the increase of co-pyrolysis temperature, the catalytic activity of Co-C-X increased, due to the different coordination structures of cobalt. At 500 o C (Co-C-500), cobalt existed as CoO; while it was single atom Co at 600 o C (Co-C-600); and small size CoO at 700 o C (Co-C-700). Co-C-X could activate PMS to produce hydroxyl radicals, sulfate radicals, high-valent cobalt-oxo and singlet oxygen, which depended on the pyrolysis temperature. Although Co-C-700 had the highest catalytic activity, the leaching cobalt was also highest (3.23 mg/L), compared with that of Co-C-500 (0.27 mg/L) and Co-C-600 (0.14 mg/L). Co-C-600 had fast degradation for atrazine, nitrobenzene, bisphenol A, phenol and 4-chlorophenol, which also had wide pH range and high tolerance to inorganic ions. • Pyrolysis temperature could modulate the coordination structure of cobalt atom. • Co single atom catalyst was obtained via co-pyrolysis of g-C 3 N 4 and VB 12 at 600 o C. • Multi reactive species were identified in the system of Co-C-X/PMS. • Co-C-X/PMS could effectively degrade various emerging organic pollutants.
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