Partículas de CoO(OH) Dispersas em Pasta de Carbono Aplicado na Eletrooxidação de Compostos Fenólicos

Abstract

In this work, particles of cobalt oxyhydroxide (III), CoO (OH), synthesized by alkaline precipitation were used in a carbon paste electrode modified [CPEM_CoO(OH)] for the detection of phenolic compounds (catechol, guiacol, pyrogallol and salicylic acid). The cobalt-based electrode acts as the electron mediator, where the ion Co (III) acts effectively in the oxidation/reduction of analyte, via reductive dissolution. As a result, the modified carbon paste electrode [CPEM_CoO(OH)] exhibited good performance in the detection of phenolic compounds in a concentration range between 0 to 0.15 µmol L-1, with a limit of detection (LOD) of 10-8 mol L-1. The electrochemical studies were performed using the techniques of cyclic voltammetry and linear. DOI: http://dx.doi.org/10.17807/orbital.v7i4.780

Keywords

• cobalt oxyhydroxide (iii)
• modified electrode
• electrochemical detection
• phenolic compounds