Lead signal enhancement in anodic stripping voltammetry using graphene oxide and pectin as electrode modifying agents for biofuel analysis

Autor(es)

da Conceicao, Emanuela ; Buffon, Edervaldo ; Stradiotto, Nelson Ramos

• Tipo de documento: Artigo Científico
• Fonte: FUEL; v. 325, p. 9-pg., 2022-10-01.

Resumo

This work reports the development of a composite material containing graphene oxide and pectin (GO-PEC) to increase the lead signal during the analysis of biofuels through differential pulse anodic stripping voltammetry. To this end, a glassy carbon electrode was used as substrate for the immobilization of the GO-PEC composite. This electrode was characterized through cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy, Raman spectroscopy and energy dispersive X-ray spectroscopy. The results obtained showed that the GO-PEC composite promoted a 90-fold increase in the intensity of the anodic stripping current of lead. The electrode containing the GO-PEC composite presented a linear range of 1.0 x 10-9 to 1.0 x 10-6 mol L-1 and a detection limit of 4.0 x 10- 10 mol L-1. This device also exhibited reproducible and stable voltammetric responses as well as excellent selectivity for lead detection. The proposed electrode was applied for the determination of lead in biodiesel and biokerosene samples. Recovery tests and flame atomic absorption spectroscopy analyses confirmed that this electrode has excellent precision and accuracy for lead detection. These results show that the electrode developed in this work can be successfully used for lead monitoring in biofuel samples. (AU)

• Processo FAPESP: 17/22401-8 - Fruto-refinaria: processos de obtenção, métodos de caracterização e geração de produtos oriundos de resíduos da fruticultura
• Beneficiário: Nelson Ramos Stradiotto
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/25329-6 - Desenvolvimento de novos métodos analíticos para avaliação da qualidade de bioquerosene de aviação
• Beneficiário: Nelson Ramos Stradiotto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/13818-8 - Desenvolvimento de sensores descartáveis baseados em óxido de grafeno 3D, nanopartículas metálicas e polímeros molecularmente impressos para determinação de ácidos fenólicos em resíduos da fruticultura
• Beneficiário: Edervaldo Buffon
• Modalidade de apoio: Bolsas no Brasil - Doutorado