Synthesis, Purification, and Characterization of Carbon Dots from Non-Activated and Activated Pyrolytic Carbon Black

Synthesis, Purification, and Characterization of Carbon Dots from Non-Activated and Activated Pyrolytic Carbon Black

In this work, carbon dots were created from activated and non-activated pyrolytic carbon black obtained from waste tires, which were then chemically oxidized with HNO . The effects caused to the carbon dot properties were analyzed in detail through characterization techniques such as ion chromatogra...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Vol. 12; no. 3; p. 298
Main Authors: González-González, Reyna Berenice, González, Lucy Teresa, Madou, Marc, Leyva-Porras, César, Martinez-Chapa, Sergio Omar, Mendoza, Alberto
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 18-01-2022
MDPI
Subjects:
Activated carbon
Biocompatibility
Black carbon
Carbon
Carbon black
Carbon dots
carbon nanoparticles
chemical activation
Chemical synthesis
Chromatography
Dialysis
Fluorescence spectroscopy
Fourier transforms
Functional groups
Hemodialysis
Infrared spectroscopy
Microscopy
Nanomaterials
Optical properties
Oxidation
Particle size
Photoelectron spectroscopy
Photoelectrons
Photoluminescence
Photons
Precursors
Purification
Radiation
Raman spectra
Raman spectroscopy
Spectrum analysis
Tires
top-down synthesis
Transmission electron microscopy
waste valorization
X ray photoelectron spectroscopy
United States > US
carbon nanoparticles
top-down synthesis
waste valorization
chemical activation
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Summary:In this work, carbon dots were created from activated and non-activated pyrolytic carbon black obtained from waste tires, which were then chemically oxidized with HNO . The effects caused to the carbon dot properties were analyzed in detail through characterization techniques such as ion chromatography; UV-visible, Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy; ζ potential; transmission electron microscopy (TEM); and spectrofluorometry. The presence of functional groups on the surface of all carbon dots was revealed by UV-visible, FTIR, XPS, and Raman spectra. The higher oxidation degrees of carbon dots from activated precursors compared to those from nonactivated precursors resulted in differences in photoluminescence (PL) properties such as bathochromic shift, lower intensity, and excitation-dependent behavior. The results demonstrate that the use of an activating agent in the recovery of pyrolytic carbon black resulted in carbon dots with different PL properties. In addition, a dialysis methodology is proposed to overcome purification obstacles, finding that 360 h were required to obtain pure carbon dots synthesized by a chemical oxidation method.
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ISSN:2079-4991
2079-4991
DOI:10.3390/nano12030298