| Texto completo | |
| Autor(es): |
Sevene, Daniel R.
;
Matias, Tiago A.
;
Araujo, Diele A. G.
;
Inoque, Nelio I. G.
;
Nakamura, Marcelo
;
Paixao, Thiago R. L. C.
;
Munoz, Rodrigo A. A.
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS OMEGA; v. N/A, p. 10-pg., 2024-11-19. |
| Resumo | |
Synthetic antioxidants are often introduced to biodiesel to increase its oxidative stability, and tert-butyl hydroquinone (TBHQ) has been selected due to its high efficiency for this purpose. The monitoring of antioxidants in biodiesel therefore provides information on the oxidative stability of biodiesels. Herein, a laser-induced graphene (LIG) electrode is introduced as a new sensor for detecting tert-butyl hydroquinone (TBHQ) in biodiesel samples. An infrared CO2 laser was applied for LIG formation from the pyrolysis of polyimide (Kapton). Based on the voltammetric profile of a reversible redox probe, the fabrication of LIG electrodes was set using 1.0 W power and 40 mm s-1 speed, which presented an electroactive area of 0.26 cm2 (higher than the geometric area of 0.196 cm2). Importantly, lower engraving speed resulted in higher electroactive area, probably due to a more efficient graphene formation. Scanning-electron microscopy and Raman spectroscopy confirmed the creation of porous graphene induced by laser. The sensing platform enabled the differential-pulse voltammetric determination of TBHQ from 5 and 450 mu mol L-1. The values of detection limit (LOD) of 2 mu mol L-1 and RSD (relative standard deviation) of 2.5% (n = 10, 10 mu mol L-1 of TBHQ) were obtained. The analysis of spiked biodiesel samples revealed recoveries from 88 to 106%. Also, the method provides a satisfactory selectivity, as it is free of interference from metallic ions (Fe3+, Mn2+, Cr2+, Zn2+, Pb2+, and Cu2+) commonly presented in the biofuel. These results show that LIG electrodes can be a new electroanalytical tool for detecting and quantifying TBHQ in biodiesel. (AU) | |
| Processo FAPESP: | 22/01810-5 - Plataformas microfluídicas fabricadas com fios têxteis e impressão 3d para eletroanálises de amostras clínicas, ambiental e biológicas |
| Beneficiário: | Diele Aparecida Gouveia Araújo |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 23/00246-1 - Dispositivos miniaturizados visando à produção em larga escala: fabricação, caracterização e aplicações in-situ |
| Beneficiário: | Mauro Bertotti |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |