期刊
CHEMICAL ENGINEERING JOURNAL
卷 355, 期 -, 页码 118-129出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.08.134
关键词
Metal-free oxidation; N-doping; Microwave; Defects; Catalytic ozonation; ROS
资金
- National Natural Science Foundation of China [21606253]
- National Science Fund for Distinguished Young Scholars of China [51425405]
- Science Foundation of China University of Petroleum, Beijing [2462016YJRC013]
- Beijing Natural Science Foundation [8172043]
N-doped graphene has demonstrated exceptional activities in versatile metal-free catalytic processes. In this study, reduced graphene oxide (rGO) and N-doped rGO were synthesized by a facile approach via microwave reduction with a low energy input and short reaction time. The activities of the derived carbocatalysts were evaluated by catalytic ozonation of 4-nitrophenol (4-NP). Compared with thermally annealed rGOs in argon atmosphere, microwave treated rGO demonstrated a better performance in catalytic oxidation, and N-doping would further improve the catalytic activity. It is discovered that microwave irradiation not only gave rise to more edging sites and dangling bonds in rGO, making higher catalytic potentials for ozone decomposition than that from thermal annealing, but also resulted in a higher concentration of N dopants. XPS studies revealed that more graphitic N species were incorporated into the carbon basal plane during the microwave reduction processes. The reactive oxygen species (ROS) in 4-NP oxidation were evaluated and identified by liquid-phase electron spin resonance (ESR) and radical scavenging tests, which indicated the generation of O-2(center dot-), center dot OH and O-1(2) for 4-NP degradation. This study provides a facile protocol for fabricating advanced nanocarbon materials for green oxidation and enables new insights in catalytic ozonation with state-of-the-art carbocatalysis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据