Microwave-assisted synthesis of water-soluble red-emitting carbon dots derived from spinach powder and its Pb2+ fluorescence detection application

doi:10.7503/cjcu20250082

Chem. J. Chinese Universities

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Microwave-assisted synthesis of water-soluble red-emitting carbon dots derived from spinach powder and its Pb²⁺ fluorescence detection application

JIANG Tingjie¹, CAO Jueran¹, YAO Shengfeng², SONG Jian³, LI Na¹, CHEN Yongying¹, LI Wei¹, ZHANG Haoran¹, LEI Bingfu¹

1. College of Materials and Energy, South China Agricultural University
2. Zhe Jiang Biomass Solution Co., Ltd. 3. Guangdong Dahai Biotechnology Co., Ltd.

Received:2025-03-24 Revised:2025-04-09 Online First:2025-04-16 Published:2025-04-16
Contact: Bingfu LEI E-mail:tleibf@scau.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.12274144, 22361132525) and the Natural Science Foundation of Guangdong Province, China(Nos. 2022A1515010229, 2022A1515012448)

Abstract

Abstract: In this study, water-soluble red carbon dots (R-CDs) were successfully synthesized via a microwave-assisted method using spinach powder as the carbon precursor. The optical properties, structural characteristics, and fluorescence regulation mechanisms of R-CDs were systematically investigated. The results demonstrated that R-CDs exhibit uniform particle size distribution (3.62 nm), long-wavelength red light emission (648 nm), and a narrow FWHM (30 nm). The observed fluorescence redshift is attributed to the synergistic interaction between hydroxyl groups and graphitic-nitrogen. A fluorescent probe based on R-CDs was developed for highly selective detection of Pb2? ions, with a linear response range of 0–40 nM and a detection limit of 42 nM (R2 = 0.99). Further studies revealed that the interaction between Pb2? and R-CDs is primarily governed by a dynamic quenching mechanism. This work provides a novel and environmentally friendly approach for the synthesis of red carbon dots and their application in heavy metal ion sensing.

Key words: Carbon dots, Red fluorescence, Lead ion, Fluorescent probe

CLC Number:

O657.3

TrendMD:

JIANG Tingjie, CAO Jueran, YAO Shengfeng, SONG Jian, LI Na, CHEN Yongying, LI Wei, ZHANG Haoran, LEI Bingfu. Microwave-assisted synthesis of water-soluble red-emitting carbon dots derived from spinach powder and its Pb²⁺ fluorescence detection application[J]. Chem. J. Chinese Universities, doi: 10.7503/cjcu20250082.

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Microwave-assisted synthesis of water-soluble red-emitting carbon dots derived from spinach powder and its Pb²⁺ fluorescence detection application

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