Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (6): 20250082.doi: 10.7503/cjcu20250082

• Article • Previous Articles     Next Articles

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. 1.College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China
    2.Zhejiang Biomass Solution Co. ,Ltd. ,Huzhou 313000,China
    3.Guangdong Dahai Biotechnology Co. ,Ltd. ,Shenzhen 518105,China
  • Received:2025-03-24 Online:2025-06-10 Published:2025-04-16
  • Contact: LEI Bingfu E-mail:tleibf@scau.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(12274144);the Natural Science Foundation of Guangdong Province, China(2022A1515010229)

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 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 full width at half maxima(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 nmol/L and a detection limit of 4.2 nmol/L (R²=0.990). 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 dot, Red fluorescence, Lead ion, Fluorescent probe

CLC Number: 

TrendMD: