双功能
单线态氧
煅烧
钴
材料科学
碳纤维
化学工程
金属有机骨架
双功能催化剂
碳化
化学
催化作用
降级(电信)
多孔性
无机化学
光化学
热解
有机化学
吸附
氧气
复合材料
工程类
复合数
电信
计算机科学
作者
Hu Li,Xingyan Liu,An Guo,Jie Wu,Yi Wang,Long Yan,Guangyin Fan
标识
DOI:10.1016/j.seppur.2022.120595
摘要
Sustainable synthesis of earth-abundant metal/porous carbon architecture as a bifunctional catalyst for efficient 4-nitrophenol (4-NP) destruction and reduction is highly desirable but challengeable from the perspective of environmental protection and fine chemical syntheses. Here, we develop a simple, effective and sustainable salt-template method to prepare a [email protected] carbon nanosheets (Co/PCNS) through pyrolysis of cobalt [email protected]2SO4 precursor by carefully controlling the calcination temperature at 700 ℃. The achieved Co/PCNS reveals an excellent performance for peroxymonosulfate (PMS) activation toward 4-NP destruction with a removal efficiency of 99.5% and rate constant of 0.6186 min−1 at 25 ℃. The main active substances of the Co/PCNS/PMS system are demonstrated to be sulphate radical (SO4∙−) and singlet oxygen (1O2) by radical scavenging experiments and electron paramagnetic resonance tests. The possible degradation pathways for 4-NP in the Co/PCNS/PMS system is also proposed. Impressively, the developed Co/PCNS also exhibits an excellent catalytic activity for 4-NP reduction to 4-aminophenol with NaBH4 at 25 ℃. The Co/PCNS hybrid can be easily recovered by an external magnet and reused for five times with relatively high remained activity for the studied reactions. This study presents a facile and sustainable approach for fabricating low-cost but efficient catalysts toward organic pollutant destruction and fine chemical synthesis.
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