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<p>This research presents an economical, fast and green synthesis method to produce carbon quantum dots (CQDs) from beetroot waste (bagasse), offering a sustainable alternative. The process involves a low-cost synthesis and functionalization using different carbonization times, resulting in water-dispersible CQDs with fluorescent properties. The obtained CQDs exhibit a range of emission colors, such as green and blue, when they are excited at 325&#xa0;nm. FT-IR spectroscopy identified carbonyl groups from betalainic compounds in beetroot as responsible for the CQDs photoluminescent properties. Additionally, the CQDs were tested for their potential in sensing metal ions, particularly Cu<sup>2+</sup>. The decrease in luminescence intensity in the presence of these metal ions indicates their viability as sensing devices. This research provides a promising solution for water treatment using biomass waste, particularly relevant in developing countries with increasing water pollution issues and suggests new possibilities in metal ion sensing.</p> Graphical abstract <p></p>

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Green synthesis of carbon quantum dots (CQDs) from beetroot by carbonization method and their application in metal ion sensing (Cu2+)

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Diana Laura Díaz Santiago,
  • Oscar G. Rojas Valencia,
  • José Luis Casas Espinola,
  • Carmen Reza San Germán,
  • Miriam Estrada Flores,
  • Margarita Lizeth Alvarado Noguez,
  • Juan José López Hernández

摘要

This research presents an economical, fast and green synthesis method to produce carbon quantum dots (CQDs) from beetroot waste (bagasse), offering a sustainable alternative. The process involves a low-cost synthesis and functionalization using different carbonization times, resulting in water-dispersible CQDs with fluorescent properties. The obtained CQDs exhibit a range of emission colors, such as green and blue, when they are excited at 325 nm. FT-IR spectroscopy identified carbonyl groups from betalainic compounds in beetroot as responsible for the CQDs photoluminescent properties. Additionally, the CQDs were tested for their potential in sensing metal ions, particularly Cu2+. The decrease in luminescence intensity in the presence of these metal ions indicates their viability as sensing devices. This research provides a promising solution for water treatment using biomass waste, particularly relevant in developing countries with increasing water pollution issues and suggests new possibilities in metal ion sensing.

Graphical abstract