N-doped reduced graphene oxide quantum dots(N-rGQDs)have attracted more and more attention in efficient catalytic degradation of aqueous organic pollutants.However,the synthesis of N-rGQDs is generally a complex and high energy required process for the reduction and N-doping steps.In this study,a facile and green fabrication approach of N-rGQDs is established,based on a metal-free Fenton reaction without additional energy-input.The N structures of N-rGQDs play a significant role in the promotion of their catalytic performance.The N-rGQDs with relatively high percentage of aromatic nitrogen(NAr-rGQDs)perform excellent catalytic activities,with which the degradation efficiency of pollutant is enhanced by 25 times.Density functional theory(DFT)calculation also indicates aromatic nitrogen structures with electron-rich sites are prone to transfer electron,presenting a key role in the catalytic reaction.This metal-free Fenton process provides a green and cost-effective strategy for one-step fabrication of N-rGQDs with controllable features and potential environmental catalytic applications.

CAS Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Innovation Academy for Green Manufacture,Chinese Academy of Sciences,Beijing Engineering Research Centre of Process Pollution Control,Beijing,100190,China;University of Chinese Academy of Sciences,Beijing,100049,China;School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,China

[1]He Zhao;Juehua Wang;Zhuangjun Fan;Yongbing Xie;Di Zhang;Shanshan Sun;Yi Zhang;Hongbin Cao-.A facial synthesis of nitrogen-doped reduced graphene oxide quantum dot and its application in aqueous organics degradation)[J].绿色能源与环境（英文）,2022(03):440-448

rGQDs,NAr

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