Synthesis of Carbon Quantum Dots Based on Quinoa Straw and their Application in Alkali Metal Ions Detection

Authors

  • Ye Xing Key Laboratory of Applied Physical Chemistry of Qinghai Province, Qinghai Minzu University, Xining 810007, Qinghai, China
  • Ya-nan Wang Key Laboratory of Applied Physical Chemistry of Qinghai Province, Qinghai Minzu University, Xining 810007, Qinghai, China
  • Haichao Li Key Laboratory of Applied Physical Chemistry of Qinghai Province, Qinghai Minzu University, Xining 810007, Qinghai, China

Keywords:

Chenopodium quinoa Willd., Carbon quantum dots, Green preparation, Photoluminescence

Abstract

Carbon quantum dots (CQDs) with good water solubility and fluorescence properties were successfully synthesized from Chenopodium quinoa Willd. straw, a biomass by-product, by a one-step carbonization method. Structural characterization of the fabricated carbon quantum dots by Fourier transform infrared spectroscopy (FT-IR) demonstrated the presence of a large number of functional groups on the surface of the carbon quantum dots, which gives them good water solubility. The synthesized carbon quantum dots were characterized optically by ultraviolet-visible absorption spectroscopy (UV-Vis), photoluminescence spectroscopy (PL), and other analytical tools. Results indicate the addition of alkali metal ions gave a different degree of promotion of fluorescence intensity (Li+＞Cs+＞K+＞Na+＞Rb+), and according to this feature carbon quantum dots can be used as a new means of alkali metal ion detection.

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Published

2024-04-12

Issue

Vol. 19 No. 2 (2024)

Section

Research Article or Brief Communication