Preparation and Application of Sulfur and Nitrogen Co-doped Carbon Quantum Dots

doi:10.19894/j.issn.1000-0518.200268

Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (6): 722-730.DOI: 10.19894/j.issn.1000-0518.200268

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Preparation and Application of Sulfur and Nitrogen Co-doped Carbon Quantum Dots

WEN Guang-Ming^1,2*, JIAO Ting², DU Xiao-Yan², LI Zhong-Ping³

¹School of Chemistry and Chemical Engineering, Jinzhong University, Yuci 030619, China
²School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
³Institute of Environmental Sciences, Shanxi University, Taiyuan 030006, China

Received:2020-09-02 Revised:2021-01-04 Published:2021-06-01 Online:2021-08-01
Supported by:
National Natural Science Foundation of China (No.21575083), the Transformation of Science and Technological Achievements Programs of Higher Education Institutions in Shanxi (No.2019KJ008), the Natural Science Foundation of Shanxi Province (No.201801D121042) and Shanxi Province Hundred Talents Project(No.2019)

Abstract

Abstract: Sulphur and nitrogen co-doped carbon quantum dots (SN-CQDs) were synthesized by one-step hydrothermal method using neutral red and thiourea as raw materials. The morphology and optical properties of the synthesized CQDs were characterized by transition electron microscopy (TEM), ultraviolet, X-ray photoelectron spectroscopy (XPS) and fluorescence techniques. The synthesized SN-CQDs have uniform size and high stability. In the fluorescence spectrum, the maximum emission wavelength is 628 nm, and the maximum excitation wavelength is 510 nm. Chromium ions (Cr³⁺) and 4-nitrophenol (4-NP) have a fluorescence quenching effect on SN-CQDs. Using SN-CQDs as fluorescent probes for Cr³⁺, 4-NP detection, the Cr³⁺ concentration in the range of 0～170 μmol/L has a good linear relationship with the fluorescence quenching degree of SN-CQDs, and the correlation coefficient is 0.9922. The concentration of 4-NP in the range of 0～240 μmol/L shows a good linear relationship with the fluorescence quenching, and the correlation coefficient is 0.9955. In the actual water sample detection, the SN-CQDs has high accuracy, high sensitivity and good anti-interference ability to Cr³⁺ and 4-NP detection. This work provides a new detection method for Cr³⁺ and 4-NP.

Key words: Sulfur and nitrogen co-doping, Carbon quantum dots, 4-Nitrophenol detection, Cr³⁺ detection

CLC Number:

O657.3

WEN Guang-Ming, JIAO Ting, DU Xiao-Yan, LI Zhong-Ping. Preparation and Application of Sulfur and Nitrogen Co-doped Carbon Quantum Dots[J]. Chinese Journal of Applied Chemistry, 2021, 38(6): 722-730.

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Preparation and Application of Sulfur and Nitrogen Co-doped Carbon Quantum Dots

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