Metal-free catalytic ozonation on surface-engineered graphene: Microwave reduction and heteroatom doping 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Chemical engineering journal
年/卷/期
2019 / 355 /
页码
118-129
ISSN号
1385-8947
作者单位
China Univ Petr, Dept Chem Engn, State Key Lab Heavy Oil Proc, 18 Fuxue Rd, Beijing 102249, Peoples R China;Chinese Acad Sci, Inst Proc Engn, Div Environm Technol & Engn, Beijing 100190, Peoples R China;China Univ Petr, Dept Chem Engn, State Key Lab Heavy Oil Proc, 18 Fuxue Rd, Beijing 102249, Peoples R China;Chinese Acad Sci, Inst Proc Engn, Div Environm Technol & Engn, Beijing 100190, Peoples R China;Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Joondalup, WA 6027, Australia;Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;
作者
Wang, Yuxian;Cao, Hongbin;Chen, Chunmao;Xie, Yongbing;Sun, Hongqi;Duan, Xiaoguang;Wang, Shaobin;
摘要
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.
机翻摘要
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关键词/主题词
Metal-free oxidation;N-doping;Microwave;Defects;Catalytic ozonation;ROS;
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