Abstract
The nanocrystals of COF-300 were produced and employed as a sensitive species for modifying the carbon paste electrode (CPE) to present an electrochemical sensor for quantifying silver by strip** voltammetry technique. Various characterization experiments (FT-IR, XRD, BET, SEM/EDS, cyclic voltammetry (CV), and electrochemical impedance (EIS)) approve the correctness of the COF-300 synthesis and the appropriate performance of the structured COF-300/CPE. Employing central composite design (CCD), the best quantities of the parameters influencing COF-300/CPE operation have been ascertained. The chemical stability and high crystallinity of COF-300, together with the presence of many recognition elements (nitrogen, oxygen, and π-electrons) in the structure of COF-300, as well as its high area and porosity, provide the conditions for depositing a large quantity of silver in the COF-300/CPE matrix. The COF employed to organize this sensor has been chosen and synthesized in such a manner that its size discrimination individuality makes it admit silver and prevent other interference species. The ability of the designed COF-300/CPE to measure silver without major mercury interference is a very desirable electro-analytical feature of this sensor. These properties of COF-300 ultimately lead to high sensitivity and selectivity of the COF-300/CPE sensor. Using electrochemical and SEM/EDS procedures, the mechanism of the COF-300/CPE function was investigated. Regression procedure in the range of 1 × 10–9–1 × 10–5 M leads to a linear relation between strip** current and silver concentration. The LOD (RSD = 1/3) was 3.0 × 10–10 M. The RSD values for five electrodes and each with five repetitions are about 3% for the concentration of 5 µM silver(I). Several statistical tests were used to indicate the analytical reliability of the structured COF-300/CPE.
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Zanganeh, A.R., Tayebani, M. Nanocrystals of COF-300 as physical and chemical recognition elements in silver(I) voltammetric sensor: experimental condition optimization by central composite design. Monatsh Chem 154, 339–353 (2023). https://doi.org/10.1007/s00706-023-03047-6
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DOI: https://doi.org/10.1007/s00706-023-03047-6