Preparation and Application of N-Heterocyclic Aryl Water-Soluble Carbon Dots Full-Spectrum UV Absorbers

doi:10.19894/j.issn.1000-0518.230148

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (12): 1700-1711.DOI: 10.19894/j.issn.1000-0518.230148

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Preparation and Application of N-Heterocyclic Aryl Water-Soluble Carbon Dots Full-Spectrum UV Absorbers

Jing-Yi HU, Ya-Tong ZHENG, Wei-Hao YE, Ying-Liang LIU()

College of Materials and Energy，South China Agricultural University，Guangzhou 510642，China

Received:2023-05-17 Accepted:2023-11-21 Published:2023-12-01 Online:2024-01-03
Contact: Ying-Liang LIU
About author:tliuyl@scau. edu. cn
Supported by:
the National Natural Science Foundation of China(12174119);Guangzhou Science and Technology Plan Project(202103000059)

Abstract

Abstract:

Water-soluble carbon point ultraviolet absorbers using aromatic compounds containing N atoms， sodium citrate and ethylenediamine as raw materials were prepared by hydrothermal method. Aging tests were carried out on carbon points prepared by different aromatic compounds， and carbon points （A-CDs） with aging resistance were finally screened out. Among them， A-CDs was rich in functional groups such as —COOH and —NH₂ and had UV total absorption performance. The absorption performance was further improved by optimizing the reaction conditions. A-CDs was combined with polyvinyl alcohol （PVA） to form A high performance UV shielding film. When the mass fraction of CDs increases from 0.02% to 0.1%， the ultraviolet transmittance decreases from 8% to 3%， indicating that carbon points can exist stably in the film. At the same time， the addition of carbon points can reduce the aging rate of the film under ultraviolet irradiation and maintain the mechanical properties of the film.

Key words: Carbon dots, UV full absorption, Water-soluble UV absorbers, Anti-UV aging, Stability, Aromatic compounds

CLC Number:

O613.7

Jing-Yi HU, Ya-Tong ZHENG, Wei-Hao YE, Ying-Liang LIU. Preparation and Application of N-Heterocyclic Aryl Water-Soluble Carbon Dots Full-Spectrum UV Absorbers[J]. Chinese Journal of Applied Chemistry, 2023, 40(12): 1700-1711.

Figures/Tables 12

Fig.1 HRTEM image （A） and XRD patterns of A-CDs and CE-CDs （B）

Fig.2 FT-IR spectra of different CDs

Fig.3 UV-Vis spectra of CDs

Fig.4 XPS spectra of C1s （A）， N1s （B） and O1s （C） of A-CDS

Fig.5 UV-Vis spectra of A-CDs at different synthesis temperatures （A） and pH conditions （B）

Fig.6 UV-Vis spectra of different CDs

Fig.7 UV-Vis spectra of different CDs under UV aging

Fig.8 Comparison of yellowing （A） and color chart （B） of A-CDs@PVA film under UV radiation

Table 1 A-CDs@PVA yellow color difference of film under UV radiation

Sample	Aging time/d
	Initial	3		5		7		9		11
	Initial	Parallel comparison	Contrast with blank	Parallel comparison	Contrast with blank	Parallel comparison	Contrast with blank	Parallel comparison	Contrast with blank	Parallel comparison	Contrast with blank
Blank	0	0	0	0	0	0	0	0	0	0	0
0.02%	6.3	1.7	6.2	2.0	6.0	1.4	6.8	1.7	7.7	2.2	5.0
0.04%	11.6	2.4	12.8	2.4	12.2	3.7	13.5	3.2	12.2	2.4	11.3
0.06%	13.6	2.0	12.1	1.4	14.4	4.4	15.9	3.0	15.8	3.6	14.0
0.08%	13.1	2.4	14.3	4.6	15.8	5.9	17.2	6.8	18.1	6.2	18.8
0.1%	20.2	0	20.2	2.8	19.8	2.8	21.4	4.2	22.2	2.4	21.4

Fig.9 UV peak aging trend of A-CDs@PVA films under different mass fractions

Fig.10 The relationship between A-CDs@PVA film aging time （A） and mass fraction （B） of A-CDs and UV transmittance

Table 2 Mechanical properties of A-CDs@PVA films

Aging time/h	Tensile strength/MPa
Aging time/h	Blank	A-CDs@PVA film
0	4.0	3.9
100	3.5	3.5
200	2.7	3.1
300	2.0	2.5
450	1.1	1.9
600	0.5	1.2

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Preparation and Application of N-Heterocyclic Aryl Water-Soluble Carbon Dots Full-Spectrum UV Absorbers

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