Journal
APPLIED SURFACE SCIENCE
Volume 548, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.149211
Keywords
Metal-free g-C3N4; GQDs; N and P co-doping; Photodegradation
Categories
Funding
- National Natural Science Foundation of China [11764011, 11664007, 51662004, 21872174, U1932148]
- Natural Science Foundation of Guangxi Zhuang Autonomous Region of China [2018GXNSFAA050014]
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In this study, nitrogen and phosphorus co-doped graphene quantum dots (NP-GQDs) were synthesized and loaded on g-C3N4 to enhance photocatalytic activity, promoting the formation, transportation, and separation of photoexcited carriers. Furthermore, the photocatalyst demonstrated outstanding recycle stability after three reused runs.
In metal-free g-C3N4 based materials, the rapid recombination of photoexcited carriers limits its photocatalytic activity. In this work, for the first time, we synthesized a new kind of diatomic-doped graphene quantum dots (GQDs), namely, nitrogen and phosphorus co-doped GQDs (NP-GQDs), and then loaded on g-C3N4 surface to obtain NP-GQDs/g-C3N4 composite photocatalyst. Under visible and ultraviolet irradiation, the MO photodegradation rate of NP-GQDs/g-C3N4 is as high as 97.5% and 96%, respectively, which was 1.71 and 1.85 times higher than that of pure g-C3N4. The remarkable enhancement of photodegradation activity is mainly attributed to the introduction of NP-GQDs could promote the formation, transportation and separation of photoexcited carriers. Furthermore, the photocatalyst exhibits outstanding recycle stability without a significant decrease in activity after three reused runs. This study provides a new understanding of the roles played by diatomic-doped graphene quantum dots in photocatalytic systems and provides a new prospect in developing highly efficient gC(3)N(4)-based photocatalysts.
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