Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 36, Pages 13814-13821Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta04297j
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Funding
- National Key Basic Research Program of China [2013CB933200]
- National 863 plans projects [2012AA062703]
- Youth Innovation Promotion Association CAS [2012200]
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)
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A novel and facile post-grafting strategy, instead of conventional copolymerization, via a Schiff base chemical reaction between aldehyde and -NH2 groups has been developed to construct aromatic heterocycle-grafted graphitic carbon nitride (g-C3N4) photocatalysts for the first time. The highresolution N 1s XPS spectrum and the CO2 TPD analysis confirmed the successful introduction of heterocycles and the reduced structural defects (unreacted -NH2 groups during the copolymerization modification of g-C3N4). The post-grafting of aromatic rings into the g-C3N4 network did not disrupt the original framework of g-C3N4, but effectively expanded its p-delocalized system, enlarged its surface area and promoted the separation and transfer of photo-excited charge carriers. As a result, the obtained copolymer composites exhibit significantly enhanced visible-light photocatalytic activity for H-2 evolution over pristine g-C3N4. This strategy is general and can be used to graft large numbers of aromatic rings of different molecular structures onto g-C3N4.
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