본문 바로가기
  • Home

N, S co-doped fluorescent carbon dots synthesized by microwave irradiation: a sensitive probe for Pb (II) ions detection in food samples

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2023, 33(6), pp.1629-1638
  • DOI : 10.1007/s42823-023-00529-9
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : January 30, 2023
  • Accepted : May 10, 2023
  • Published : October 1, 2023

Aboobakri Elias 1 Heidari Tahereh 1 Jahani Moslem 2

1Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box: 9177948974, Mashhad, Iran
2Department of Food Chemistry, Research Institute of Food Science and Technology (RIFST), Mashhad, Iran

Accredited

ABSTRACT

Sulfur and nitrogen co-doped carbon dots (NSCDs) were quickly synthesized by the microwave-assisted method from tri-ammonium citrate and thiourea. NSCDs showed a quantum yield of 11.5% with excitation and emission bands at 355 and 432 nm, respectively. Also, a fluorescence quenching was observed in the presence of Pb(II) ions, and the as-synthesized CDs were used as a sensitive probe for detecting Pb(II) in water and food samples. The results showed the optimal conditions for Pb(II) determination were CDs concentration of 0.02 mg mL−1 at pH 6.0–7.0 and an incubation time of 20 min. The relative fluorescence intensity of NSCDs was proportional to Pb(II) concentrations in the range of 0.029–2.40 and 2.40–14.4 µmol L−1 with a correlation coefficient (R2) of 0.998 and 0.955, respectively, and a detection limit of 9.2 × 10–3 µmol L−1. Responses were highly repeatable, with a standard deviation below 3.5%. The suggested method demonstrates the potential of a green, fast, and low-cost approach for Pb(II) determination in water, tea, and rice samples with satisfying results.

Citation status

* References for papers published after 2022 are currently being built.