Carbon Trends (Oct 2021)

Carbon-dots from babassu coconut (Orbignya speciosa) biomass: Synthesis, characterization, and toxicity to Daphnia magna

  • Rubens S. Costa,
  • Manuela O. de Castro,
  • Gabriela H. da Silva,
  • Fabricio de S. Delite,
  • Mathias Strauss,
  • Odair P. Ferreira,
  • Diego S.T. Martinez,
  • Bartolomeu C. Viana

Journal volume & issue
Vol. 5
p. 100133

Abstract

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The present study provides amethodology for the synthesis of carbon dots through hydrothermal carbonization of the babassu coconut (Orbignya speciosa) mesocarp as a precursor matrix. The synthesis parameters (temperature, residence time and% m/v) were studied through a factorial design with the fluorescence intensity as determining factor in choosing the best sample. Particles with diameters in the range of 2.4 - 47.7 nm were obtained, which presented two emission regions, one at approximately 467 nm (λEX = 370 nm) and the other at approximately 550 nm (λEX = 470 nm). These carbon dots showed the phenomenon of suppression of fluorescence when in the presence of Fe3+, Co2+, Ni2+, Zn2+, Cu2+ and Cd2+ ions, exhibiting good linearity in the fluorescence decay according to the concentration of ions in the medium, indicating potential application as a sensor for these ionic species. Acute toxicity testing with Daphnia magna model demonstrated absence of toxic effect (immobility) of the carbon dots to this aquatic organism bioindicator after 48 h of exposure, even at high concentrations (up to 1000 mg.L−1).

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