Facile synthesis of porous nitrogen doped carbon dots (NCDs)@g-C3N4 for highly efficient photocatalytic and anti-counterfeiting applications

A novel porous nitrogen doped carbon dots (NCDs)@g-C3N4 composite was successfully synthesized by a facile hydrothermal approach. The surface area of NCDs@g-C3N4 can reach up to 60.9 m3/g, and pores with diameter between 20–50 nm are the most widely distributed. The photocatalytic activity of NCDs@g...

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Bibliographic Details
Published in:Applied surface science 2019-10, Vol.490, p.592-597
Main Authors: Yang, Xue-Chun, Yang, Yun-Ling, Zhang, Shao-Lin, Liu, Yu-Feng, Fu, Si-Jie, Zhu, Meng, Hu, Jian-Feng, Zhang, Zhi-Jun, Zhao, Jing-Tai
Format: Article
Language:English
Subjects:
Fluorescent inks
g-C3N4
Hydrothermal
NCDs
Photocatalytic
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Summary:A novel porous nitrogen doped carbon dots (NCDs)@g-C3N4 composite was successfully synthesized by a facile hydrothermal approach. The surface area of NCDs@g-C3N4 can reach up to 60.9 m3/g, and pores with diameter between 20–50 nm are the most widely distributed. The photocatalytic activity of NCDs@g-C3N4 toward the degradation of Methylene blue (MB) under visible light irradiation was remarkably higher than that of g-C3N4 and NCDs. The improved photocatalytic activity can be attributed to the fact that the addition of NCDs not only broadens the photo-response range, but also suppresses the photo-generated electrons and holes recombination of g-C3N4. Degradation rate of 2.0 wt% NCDs@g-C3N4 is about twice than that of pristine g-C3N4 at 60 min under the same conditions. In addition, at 120 min, MB was almost degraded completely by 2.0 wt% NCDs@g-C3N4 with the degradation rate as high as 97.9%, while the pristine g-C3N4 was only 69%. NCDs@g-C3N4 can be used as a potential catalyst for organic contaminants degradation considering its high photo-response range and excellent photocatalytic activity. Moreover, NCDs, g-C3N4 and NCDs@g-C3N4 also can be used as fluorescent inks for anti-counterfeiting. [Display omitted] •A novel porous NCDs@g-C3N4 composite was synthesized by a hydrothermal approach without template.•The photocatalytic activity of NCDs@g-C3N4 was remarkably higher than that of g-C3N4 and NCDs.•NCDs broadens the photo-response range and suppresses the electrons and holes recombination of g-C3N4.•NCDs, g-C3N4 and NCDs@g-C3N4 also can be used as fluorescent inks for anti-counterfeiting.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2019.05.367