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A solventless method was used to prepare NiO nanoparticles (NPs) while an aqueous extract from banana peels was used to green synthesize Bi 2 O 3 NPs. Characterization of the resulting samples indicated the formation of pure mesoporous NiO and Bi 2 O 3 NPs with crystallite sizes of 23 and 3.1 nm, respectively. A glassy carbon electrode (GCE) was modified by applying chitosan (CS) along with NiO and Bi 2 O 3 NPs. The fabricated NiO-Bi 2 O 3 /CS/GCE sensor was applied for the simultaneous determination of p -nitrophenol ( p -NP) and o -nitrophenol ( o -NP) using cyclic, linear sweep, and differential pulse voltammetry. p -NP showed excellent behavior in PBS electrolyte at pH 7.0 and a 100 mV/s scan rate. The calculated limits of detection and quantitation and linear range were 23.8, 79.5, and 0.1–100 nM, respectively. The sensor demonstrated high selectivity (less than 5% change in the presence of various interferences), reproducibility (2.43% RSD), and stability (98.35% after one month). Finally, the sensor had successfully estimated p -NP in tap and wastewater samples.
Hasan et al. (Wed,) studied this question.