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Cyano group modified carbon nitride with enhanced photoactivity for selective oxidation of benzylamine
Tan, Hao; Gu, Xianmo; Kong, Peng; Lian, Zan; Li, Bo; Zheng, Zhanfeng
2019-03-01
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume242Pages:67-75
AbstractPolymeric graphitic carbon nitride (g-C3N4) is a promising photocatalyst but suffers from the high recombination rate of photogenerated carriers. Many strategies for introducing active "sites", such as heteroatom doping and defect creation, which can hinder recombination by capturing the separated electrons or holes, have been developed to solve the problem. As a polymeric organic material, it is possible to alter the electron structure and improve the charge separation by introducing organic groups with different electronegativities or conjugation properties to the side chains. Herein, we report a facile and efficient -C equivalent to N group modification strategy using the thermal condensation of the thiocyanuric acid (TA) precursor. The sulfur content in the precursor forms -C=N=S and then transforms to -C equivalent to N. The -C equivalent to N group introduced catalyst exhibits enhanced light absorption and a low carrier recombination rate based on optical and photoelectrical measurements. This is due to the formation of a -C equivalent to N group related midgap state between the bandgap of g-C3N4, according to a density functional theory (DFT) calculation. The -C equivalent to N groups can also loosen the stacking texture of g-C3N4 and result in a thinner layer structure during the post-thermal treatment, which can shorten the distance of photogenerated carrier transfer from the bulk to the surface. The -C equivalent to N group introduced photocatalyst is efficient for the selective oxidation of benzylamine to imine, even under green light irradiation. This result demonstrates that the introduction of an electron rich conjugation group such as -C equivalent to N into the edge chain of polymeric carbon nitride is efficient for better photoactivity.
KeywordCyano group Carbon nitride Midgap state Benzylamine Thin-layered structure
Indexed BySCI
Language英语
WOS IDWOS:000450135000008
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81352
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Tan, Hao,Gu, Xianmo,Kong, Peng,et al. Cyano group modified carbon nitride with enhanced photoactivity for selective oxidation of benzylamine[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2019,242:67-75.
APA Tan, Hao,Gu, Xianmo,Kong, Peng,Lian, Zan,Li, Bo,&Zheng, Zhanfeng.(2019).Cyano group modified carbon nitride with enhanced photoactivity for selective oxidation of benzylamine.APPLIED CATALYSIS B-ENVIRONMENTAL,242,67-75.
MLA Tan, Hao,et al."Cyano group modified carbon nitride with enhanced photoactivity for selective oxidation of benzylamine".APPLIED CATALYSIS B-ENVIRONMENTAL 242(2019):67-75.
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