Preparation of Fluorescent Carbon-Based Dots from Waste Tire Pyrolysis

Journal of the Brazilian Chemical Society

article

Parra, Juliana B.¹  Panzarini, Luz Consuelo G. A.¹  Toyama, Marcos M.¹  Silva, Karina C.¹  Valezin, Pedro A. S.¹  Martins, Raphael G.¹  Gomes, Rodolfo R.¹  Pereira, Rafael S.²  Melo, Fernando M. de³  Morandim-Giannetti, Andreia de A.¹  Santos, Ronaldo G. dos¹ 

[1] Departamento de Engenharia Química;Universidade Federal do ABC;Instituto de Química, Universidade de São Paulo

关键词: waste tire;    pyrolysis;    carbon-based dots;    quantum-dots;   

DOI  :  10.21577/0103-5053.20200072

学科分类：内科医学

来源: SciELO

【 摘 要 】

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 carbon-based dots (CBD) from carbon black (CB L ) derivatives of tires is described. For this, the CB L was treated with different acids to produce CB L1 and CB L2 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 (mFTIR), 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.

【 授权许可】

CC BY