Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (02): 10-18.doi: 10.13475/j.fzxb.20210701509

• Fiber Materials • Previous Articles     Next Articles

Preparation and application of carbon dots with polyethylene terephthalate as precursor

WANG Rui1,2,3, LIU Yanlin1, LIU Yunyu1, GU Weiwen1, LIU Ziling1, WEI Jianfei1,2,3()   

  1. 1. School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
    2. BeijingKey Laboratory of Clothing Materials R&D and Assessment, Beijing Institute of Fashion Technology, Beijing 100029, China
    3. Beijing Engineering Research Center of Textile Nano Fiber, Beijing 100029, China
  • Received:2021-07-05 Revised:2021-11-26 Online:2022-02-15 Published:2022-03-15
  • Contact: WEI Jianfei E-mail:20190029@bift.edu.cn

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Abstract:

In response to the rapid increase in textile waste and the consequent environmental pollution and depletion of petroleum resources, using waste polyethylene terephthalate (PET) and ammonium dihydrogen phosphate as raw materials, phosphorus nitrogen doped PET based carbon dots were prepared by pyrolysis method. The optimal preparation process of PET based carbon dots and their morphology, chemical structure and fluorescent properties were studied, and their applications in fluorescent anti-counterfeiting were explored. The results showed that at the optimal conditions of the mass of PET oligomer of 5 g, the ammonium dihydrogen phosphate mass of 2 g, the reaction temperature of 260 ℃, and the reaction time of 18 h, the PET based carbon dots have a typical excitation wavelength dependence. The optimal excitation and emission wavelength is 320 nm and 390 nm respectively, and the fluorescence quantum yield can reach 18.26%. The average fluorescence lifetime is 6.96 ns. PET based carbon dots is stable in water solubility and excellent in anti-interference. The fluorescent inks, phosphors and fluorescent agar made from them all exhibit bright blue fluorescence under 365 nm ultraviolet light irradiation. The PET based carbon dots have huge application potential in data encryption, anti-counterfeiting, imaging, LED devices, and more, providing new possibilities for the high-value recycling of waste PET.

Key words: polyethylene terephthalate, carbon dots, fluorescent ink, pyrolysis method, high value utilization of textile waste

CLC Number: 

  • TS151

Fig.1

Effect of different preparation conditions of PET based carbon dots on fluorescence properties. (a)Dosage of diammonium hydrogen phosphate;(b)Reaction temperature;(c)Reaction time"

Fig.2

TEM images of PET based carbon dots at low (a) and high (b) resolution"

Fig.3

Infrared spectra of PET based carbon dots"

Fig.4

NMR H spectra of PET based carbon dots"

Fig.5

XPS spectrum of PET based carbon dots. (a) XPS full spectrum; (b) C1s XPS spectrum;(c) O1s XPS spectrum; (d) N1s XPS spectrum;(e) P2p XPS spectrum"

Fig.6

UV-Vis absorption spectrum of PET based carbon dots"

Fig.7

Fluorescence emission spectra (a) and fluorescence quantum yield (b)of PET based carbon dots excited by light with different wavelengths"

Fig.8

Variation of fluorescence lifetime of PET based carbon dots with emission wavelength under 365 nm laser excitation"

Fig.9

Effects of pH value(a)and metal ions(b)on fluorescence properties of PET based carbon dots"

Fig.10

Optical photo under 365 nm ultraviolet light. (a)Pattern written by a pen with fluorescent ink as ink; (b) Tiger pattern printed with inkjet printer;(c)Two-dimensional code of WeChat public account of School of Material Design and Engineering and logo of Beijing Institute of Fashion Technology"

Fig.11

Starch-carbon dot composite fluorescent powder(a)and fluorescent agar hydrogel (b) under natural light and ultraviolet light (365 nm)"

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