Co-monomer engineering optimized electron delocalization system in carbon-bridging modified g-C3N4 nanosheets with efficient visible-light photocatalytic performance

[Display omitted] •The carbon-bridging modified g-C3N4 nanosheet has been prepared successfully.•The bridging carbon optimizes the original conjugate system and band structure of g-C3N4.•The co-monomer of MLDD as a blocking agent generates numerous structure edge defects.•The as-prepared CBCN sample...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2020-10, Vol.274, p.119116, Article 119116
Main Authors: Li, Yunfeng, Wang, Shuai, Chang, Wei, Zhang, Luohong, Wu, Zhansheng, Jin, Renxi, Xing, Yan
Format: Article
Language:English
Subjects:
Bridging carbon
Carbon
Carbon nitride
Conjugates
Copolymerization
Electronegativity
Environmental degradation
g-C3N4
Hybridization
Hydrogen production
Monomers
Nanosheets
Nitrogen
Performance degradation
Photocatalysis
Photodegradation
Pollutants
Urea
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Summary:[Display omitted] •The carbon-bridging modified g-C3N4 nanosheet has been prepared successfully.•The bridging carbon optimizes the original conjugate system and band structure of g-C3N4.•The co-monomer of MLDD as a blocking agent generates numerous structure edge defects.•The as-prepared CBCN samples show a superior photocatalytic performance. The bridged nitrogen that linked each melem unit in g-C3N4 is considered to be sp3 hybridization with a high electronegativity, which confines the original conjugate system of melon networks. Herein, the carbon-bridging modified g-C3N4 nanosheet (CBCN) is prepared by a one-pot copolymerization for the first time through employing malondiamide (MLDD) as a novel polymerized small molecule to urea. Experimental and DFT computation identify that substituting parts of bridged nitrogen in melon units with carbon not only improves the original conjugate system and optimizes the band structure of g-C3N4, but also induces the charges redistribution, leading to an enhanced charges separation and visible light utilization. Moreover, the MLDD co-monomer can act as a blocking agent to generate structure edge defects, which results in numerous in-plane holes and increases the specific surface area greatly. As a result, the CBCN samples show an excellent photocatalytic performance in degradation of pollutants and H2 generation.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2020.119116