Glycerol determination by chronoamperometry using Ni(OH)(2)/RGO on carbon paste electrode

Author(s)

de Oliveira, Joao P. J. ; de Sa, Acelino C. ; de Sousa, Miguel S. P. ; Zanette, Andreia F. ; Torres, Giovanni B. ; dos Santos, Renivaldo J. ; Paim, Leonardo L.

• Document type: Journal article
• Source: Journal of Applied Electrochemistry; v. N/A, p. 14-pg., 2023-05-27.

Abstract

Glycerol is a by-product obtained in the transesterification reaction together with biodiesel, a necessary renewable fuel. The presence of glycerol in fuel can bring up environmental harm and engine damage, making fuel quality control important. In this context, composite electrodes (CE) were developed with low-cost materials like syringes, copper wire, graphite, and paraffin. The surface of composite electrodes was modified with reduced graphene oxide (RGO) and hydroxide nickel (Ni(OH)2). SEM, EDX, Raman, and FT-IR ATR characterized the developed material. The electrooxidation of glycerol in an alkaline medium containing 0.10 M of NaOH was investigated by CV. In the presence of glycerol, the modified electrode increased the anodic and cathodic peak current with an anodic peak potential shift to 0.54 V. The electrodes were employed in a study of the determination of glycerol in real biodiesel samples by a chronoamperometric technique. The modified electrode showed a sensitivity of 1.63 x 103 mu A mM and a LOD for glycerol of 2.24 x-10(-5) M (R = 0.996). The mean response time of the modified electrodes to glycerol was 1.85 s. These electrodes show good reproducibility and competitive detection limit compared to the literature. The proposed method presented satisfactory results, with 94.98 and 100.39% sample recoveries. (AU)

• FAPESP's process: 17/09123-9 - Development of composite sensors for the direct detection of carbohydrates and phenolic compounds derived from the acid hydrolysis process of sugarcane lignocellulosic materials
• Grantee: Leonardo Lataro Paim
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 17/17559-1 - Determination of glycerol in biodiesel samples by composite electrodes modified with NiO(OH) nanoparticles anchored in graphene
• Grantee: João Pedro Jenson de Oliveira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation