Publicação
Copper nanoparticles and reduced graphene oxide modified a glassy carbon electrode for the determination of glyphosate in water samples
| Resumo: | A novel electrochemical sensor based on a glassy carbon electrode, modified with reduced graphene oxide and copper nanoparticles (GC/rGO-CuNPs), was developed for the determination of glyphosate herbicide (GLY) by differential pulse voltammetry (DPV). The proposed material was synthesised by a chemical method and characterised by scanning electron microscopy (SEM) and cyclic voltammetry (CV). Voltammetric tests showed that the anodic peak at 30 mV, due to the Cu0 to Cu2+ oxidation process, decreased linearly with small additions of GLY; this inhibition was used to quantify the pesticide content in water by DPV. The GC/rGO-CuNPs electrode was evaluated and optimised for the determination of GLY in tap water samples without any pretreatment, achieving a linear response in the range of 0.1 to 1.1 µmol L−1 with a detection limit of 0.19 µmol L−1 (R2 = 0.9996). This study provides a new application for graphene-based sensors and a promising alternative for GLY analysis. |
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| Autores principais: | Setznagl, Sarah |
| Outros Autores: | Cesarino, Ivana |
| Assunto: | copper nanoparticles electrochemical sensor Glyphosate reduced graphene oxide |
| Ano: | 2020 |
| País: | Brasil |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | IBICT |
| Idioma: | inglês |
| Origem: | Oasisbr |
| Resumo: | A novel electrochemical sensor based on a glassy carbon electrode, modified with reduced graphene oxide and copper nanoparticles (GC/rGO-CuNPs), was developed for the determination of glyphosate herbicide (GLY) by differential pulse voltammetry (DPV). The proposed material was synthesised by a chemical method and characterised by scanning electron microscopy (SEM) and cyclic voltammetry (CV). Voltammetric tests showed that the anodic peak at 30 mV, due to the Cu0 to Cu2+ oxidation process, decreased linearly with small additions of GLY; this inhibition was used to quantify the pesticide content in water by DPV. The GC/rGO-CuNPs electrode was evaluated and optimised for the determination of GLY in tap water samples without any pretreatment, achieving a linear response in the range of 0.1 to 1.1 µmol L−1 with a detection limit of 0.19 µmol L−1 (R2 = 0.9996). This study provides a new application for graphene-based sensors and a promising alternative for GLY analysis. |
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