Artigo
Preparation of Fluorescent Carbon-Based Dots from Waste Tire Pyrolysis
Fecha
2020-10-30Registro en:
SILVA, K. C.; VALEZIN, P. A. S.; MARTINS, R. G.; GOMES, R. R.; PEREIRA, R. S. MELO, F. M. DE; ANDREIA DE A. M. G.; SANTOS, R G. DOS
PANZARINI, L.C. G. A.; TOYAMA, M. M. Preparation of fluorescent carbon-based dots from waste tire pyrolysis. JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY, v. 31, n. 11, p. 2224-2231, 2020.
0103-5053
Autor
PARRA, JULIANA B.
SILVA, KARINA C.
VALEZIN, PEDRO A. S.
MARTINS, RAPHAEL G.
GOMES, RODOLFO R.
PEREIRA, RAFAEL S.
MELO, FERNANDO M. DE
Andreia De Araújo Morandim Giannetti
SANTOS, RONALDO G. DOS
PANZARINI, LUZ CONSUELO G. A.
TOYAMA, MARCOS M.
Resumen
The pyrolysis of waste tire has been proposed as an alternative route to its recycling producing
residual oils that can be used as fuels. In this work, a physicochemical process to obtain carbonbased dots (CBD) from carbon black (CBL) derivatives of tires is described. For this, the CBL
was treated with different acids to produce CBL1 and CBL2 particles suspension. The pH of the
suspension was adjusted to 5.6 to precipitate remaining impurities. Afterwards, the supernatant
was ultra-centrifuged and the yellow pale solid, the purified CBD obtained by roto evaporation,
was characterized by ultraviolet-visible spectrophotometer (UV-Vis), photoluminescence (PL)
at 320-380 nm, high-resolution transmission electron microscopy (HRTEM), scanning electron
microscopy (SEM), thermogravimetric analysis (TGA), energy-dispersive X-ray spectroscopy
(EDX), Fourier transform infrared microscopy (µFTIR), and X-ray photoelectron spectroscopy
(XPS). This material showed the typical excitation wavelength dependent emission and a PL
quantum yield of 19.29% and was constituted by a well-defined spherical shaped and single sheets
of “graphene quantum dots” with undefined shape, with potential applications in optoelectronic
and fluorescence imaging devices.