Active sites and reaction mechanism for N-doped carbocatalysis of phenol removal

• 作者: Mingjie Zhang Chen Han Wenyao Chen Wei Luo Yueqiang Cao Gang Qian Xinggui Zhou Xiaoguang Duan Shaobin Wang Xuezhi Duan
• 来源期刊: 绿色能源与环境:英文版
• 学科: 化学
• 关键词: Phenol removal Carbocatalysis Multi-sites kinetics analysis Graphitic N-Containing sites Surface-bound reactive species
• 年，卷（期）: 2020,（4）
• 页码范围: 444-452
• 页数: 9页
• 分类号: O64

摘要

Heteroatom-doping of carbocatalysts has been a powerful strategy to remarkably enhance the catalytic performance.Herein,the underlying nature of N promotional effects on peroxymonosulfate(PMS)activation for phenol removal is understood by combining kinetics analysis with multiple techniques.A strategy using mixed acid oxidation of carbon nanotube(CNT)followed by NH3 treatment is employed to yield a series of catalysts with different N-doping contents but similar fraction of sp^(2)-hybridized carbon and defective degree,endowing with a chance to discriminate the dominant N-containing active sites.The multi-sites kinetics analysis suggests the graphitic N-containing sites as the dominant active sites.The mechanism of the surface-bound reactive species is also discriminated as the dominant reaction mechanism.The insights reported here could provide the methodology to fundamentally understand the heteroatom-doping effects of carbocatalysis.