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<p>This study presents a sustainable method for synthesizing carbonaceous nanoparticles (CNPs) from coffee pulp, an abundant agro-industrial residue. A simple muffle-assisted thermal treatment was used, without chemical reagents and using only water as dispersion medium. Thermal treatment was made at different temperatures and exposition times to identify the conditions at which luminescent nanoparticles can be obtained. The resulting CNPs were characterized by UV–Vis, photoluminescence (PL), and FT-IR spectroscopy. PL analysis revealed blue emission peaks at 435 and 455&#xa0;nm under 325-nm excitation, red shifted relative to the absorption band at 271&#xa0;nm. FT-IR confirmed the presence of functional groups associated with the luminescent behavior of the samples. This approach reduces the environmental impact and aligns with the principles of green chemistry and circular economy. The optical properties and structural characteristics demonstrate the potential of these CNPs for applications in sensing and photocatalysis, highlighting the value of transforming agro-industrial waste into functional nanomaterials.</p> Graphical abstract <p></p>

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Green chemistry approach for carbonaceous nanoparticles synthesis using coffee waste

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Diana Laura Díaz Santiago,
  • Oscar G. Rojas Valencia,
  • José Luis Casas Espinola,
  • Miriam Estrada Flores,
  • Carmen M. Reza-San Germán

摘要

This study presents a sustainable method for synthesizing carbonaceous nanoparticles (CNPs) from coffee pulp, an abundant agro-industrial residue. A simple muffle-assisted thermal treatment was used, without chemical reagents and using only water as dispersion medium. Thermal treatment was made at different temperatures and exposition times to identify the conditions at which luminescent nanoparticles can be obtained. The resulting CNPs were characterized by UV–Vis, photoluminescence (PL), and FT-IR spectroscopy. PL analysis revealed blue emission peaks at 435 and 455 nm under 325-nm excitation, red shifted relative to the absorption band at 271 nm. FT-IR confirmed the presence of functional groups associated with the luminescent behavior of the samples. This approach reduces the environmental impact and aligns with the principles of green chemistry and circular economy. The optical properties and structural characteristics demonstrate the potential of these CNPs for applications in sensing and photocatalysis, highlighting the value of transforming agro-industrial waste into functional nanomaterials.

Graphical abstract