Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 233, Issue -, Pages 80-87Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.03.104
Keywords
Nanosheet; Thermal treatment; Porous structure; Nitrogen vacancy; Visible light
Funding
- National Natural Science Foundation of China [51302212, 21606175]
- China Postdoctoral Science Foundation [2014T70915, 2013M540745]
- Postdoctoral Science Foundation in Shaanxi Province of China
- Natural Science Basic Research Plan in Shaanxi Province of China [2014JQ2-5022]
- Fundamental Research Funds for the Central Universities
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Graphitic carbon nitride is considered as one of the most potential photocatalysts for utilizing solar energy. Herein, an efficient route of rapid high-temperature treatment fat 800 degrees C in air for 0-20 min) was developed to modify pristine graphitic carbon nitride. It was found that, after rapid high-temperature treatment, the obtained photocatalysts showed greatly enhanced photocatalytic H-2-evolution activities (around 25.5 times) under visible-light irradiation attributed to the following reasons. More active sites for photocatalytic reaction were provided by the significant increase of surface areas. The generation, separation and transfer of photo-generated carriers were effectively promoted by the quantum confinement effect of thinner graphitic carbon nitride sheets and by the generated nitrogen vacancies in C-N heterocyclic units. Moreover, stronger driving force for photocatalytic H-2-evolution reaction was obtained to enhance the ability of water reduction reaction.
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