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Unraveling the pyridinic nitrogen vacancy in carbon nitride for photo-self Fenton-like purification of organic contaminants
Yue, Junpeng1; Yang, Hanpei1; Liu, Chen2; Wang, Shi1; Wang, Lina3
2024-11-01
摘要This work reports a carbon nitride with pyridinic nitrogen-vacancy (N2CV-CN), which purifies organic contaminants via an in-situ photo-self Fenton-like reaction. Experiments and calculations demonstrated that the nitrogen-vacancy induces lone-paired (LP) and symmetry-unpaired electrons, promoting the formation of lowenergy LP-pi hybridized orbitals and helping to overcome the pairing energy required for oxygen to accept electrons. Furthermore, the nitrogen-vacancy accelerates film and intra-particle diffusion rates of organic contaminants on N2CV-CN, creating beneficial conditions for reactive oxide species to mineralize organic contaminants. Under sunlight and atmospheric oxygen, a photo-self Fenton-like reaction involving proton-coupled electron transfer occurred on the surface of N2CV-CN. Furthermore, by integrating photocatalysis with flocculation, about 99.1 % suspended substance, 45.5 % chemical oxygen demand, and 38.4 % biological oxygen demand were reduced from polluted river-water. Constructing N2CV-CN and understanding its crucial role offer theoretical and methodological insights into the in-situ purification of contaminated water bodies.
关键词Carbon nitride Nitrogen vacancy Oxygen activation Photo-self Fenton-like Organics degradation
DOI10.1016/j.jcis.2024.06.104
发表期刊JOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN0021-9797
卷号673页码:475-485
通讯作者Yang, Hanpei(yanghanpei@hhu.edu.cn)
收录类别SCI
WOS记录号WOS:001257553100001
语种英语