Catalytic activity of gold for the electrochemical reduction of p-nitrophenol: analytical application
2020
Houcini, H. | Laghrib, F. | Bakasse, M. | Lahrich, S. | El Mhammedi, M.A.
Para-nitrophenol (PNP) is a toxic compound that enters the environment during manufacturing and processing of a variety of industrial products. In this work, we present a study on the electrocatalytic reduction of PNP to p-hydroxyl aminophenol in aqueous solutions using metallic gold electrode. p-Hydroxyl aminophenol has been used abundantly as a model substance to check the catalytic activity of metallic gold electrode. Here, we present a full kinetic scheme that includes the intermediate p-Hydroxyl aminophenol. The discussion of the resulting kinetic equations shows that the reduction of PNP at the surface of metallic gold electrode is a diffusion transfer process and irreversible. The analytical performance was also evaluated with respect to PNP concentration, and other variables. A linear calibration graph was obtained in the concentration range from 5.0 × 10⁻⁷ to 5.0 × 10⁻³ mol L⁻¹ PNP. The detection limit was found to be 5.0 × 10⁻⁷ mol L⁻¹. For eight tests, the differential pulse response was reproduced with 1.9% relative standard deviation at 5.0 × 10⁻⁶ mol L⁻¹ PNP in acetate buffer solution.
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