Metallic nanoparticles have been widely employed for the development of devices due to physicochemical properties, such as excellent electrical and thermal conductivities and catalytic activities, thus making them promising materials in electroanalysis. Nitrite is an inorganic compound used in the fertilizer industry and as a preservative in the food industry, which is a potentially polluting compound that affects water systems and human health, thus requiring its determination. Then, this work describes the development of a new electrocatalyst with Pd and Ag supported on carbon black by the sodium borohydride reduction method (I), with the composition of metals in the ratio of 1:1 (w/w), comprising 20% (w/w) of the final material and the modification of a glassy carbon electrode surface by dispersing the conductive nanocomposite with tapioca (II). In this context, the characterization of PdAg/carbon black on the electrode surface was performed by scanning electron microscopy, X-ray diffraction, and cyclic voltammetry (IV). Also, the proposed electrode was used for the determination of nitrite using the differential pulse voltammetry technique, observing a linear range from 5.0 to 1000 µmol L–1, with a detection limit of 1.2 µmol L–1. The proposed method was applied for the detection of the analyte of interest in environmental and food samples, with a percentage recovery from 86 to 105%. Thereby, the electrocatalyst production is simple and proved to be sensitive and reproducible (RSD = 4,55%, n = 4) for electrochemical sensing.

Pd and Ag binary nanoparticles supported on carbon black and tapioca for nitrite detection

ACS Spring 2022

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