4.7 Article

Designing nitrogen and phosphorus co-doped graphene quantum dots/g-C3N4 heterojunction composites to enhance visible and ultraviolet photocatalytic activity

期刊

APPLIED SURFACE SCIENCE
卷 548, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apsusc.2021.149211

关键词

Metal-free g-C3N4; GQDs; N and P co-doping; Photodegradation

资金

  1. National Natural Science Foundation of China [11764011, 11664007, 51662004, 21872174, U1932148]
  2. 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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