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<p>The detection of heavy-metal ions is necessary owing to their wide and increasing utilization. Fluorometric detection has been suggested for the detection of heavy-metal ions because of its low cost, high detection speed, and high accuracy. This study investigates heavy-metal detection using carbon dots (CDs) derived from o-phenylenediamine. The CDs were synthesized via hydrothermal synthesis and had an average particle size of 2&#xa0;nm and a hexagonal lattice structure. The existence of chemical bonds between C, N, O, and H was confirmed by analyzing the XPS and FTIR spectra of the CDs. The CDs exhibited excitation-independent emission characteristics and yellow luminescence at 566&#xa0;nm under ultraviolet-blue light excitation owing to the carbon–nitrogen bonds in the CDs. When Cr<sup>3+</sup> was dissolved in the CD solution, the rate of decrease in the luminescence intensity was higher than that of the other experimental samples. The limit of detection was calculated to be 0.161&#xa0;μM by determining the relationship between the Cr<sup>3+</sup> concentration and luminescence intensity at 566&#xa0;nm. Analysis of the luminescence-decay curve and luminescence intensity showed that the decline in yellow luminescence originated from photoinduced electron transfer between the Cr<sup>3+</sup> ions and CDs. These results indicate that CDs can be utilized as fluorometric sensors for Cr<sup>3+</sup> detection in wastewater.</p>

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Luminescent quenching of carbon dots originated from o-phenylenediamine for Cr3+ detection in wasted water

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Woo Tae Hong,
  • Jae Yong Jung,
  • Jin Young Park,
  • Hyun Kyoung Yang

摘要

The detection of heavy-metal ions is necessary owing to their wide and increasing utilization. Fluorometric detection has been suggested for the detection of heavy-metal ions because of its low cost, high detection speed, and high accuracy. This study investigates heavy-metal detection using carbon dots (CDs) derived from o-phenylenediamine. The CDs were synthesized via hydrothermal synthesis and had an average particle size of 2 nm and a hexagonal lattice structure. The existence of chemical bonds between C, N, O, and H was confirmed by analyzing the XPS and FTIR spectra of the CDs. The CDs exhibited excitation-independent emission characteristics and yellow luminescence at 566 nm under ultraviolet-blue light excitation owing to the carbon–nitrogen bonds in the CDs. When Cr3+ was dissolved in the CD solution, the rate of decrease in the luminescence intensity was higher than that of the other experimental samples. The limit of detection was calculated to be 0.161 μM by determining the relationship between the Cr3+ concentration and luminescence intensity at 566 nm. Analysis of the luminescence-decay curve and luminescence intensity showed that the decline in yellow luminescence originated from photoinduced electron transfer between the Cr3+ ions and CDs. These results indicate that CDs can be utilized as fluorometric sensors for Cr3+ detection in wastewater.