Journal
TALANTA
Volume 221, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2020.121562
Keywords
Porous Cu-MOF; Cyanide; Selectivity; Differential pulse voltammetry; Environmental water samples
Categories
Funding
- ministry of education, Najran University Kingdom of Saudi Arabia [NU/MID/17/049]
- Deanship of Scientific Research, Najran University Kingdom of Saudi Arabia [NU/MID/17/049]
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In this study, a carbon paste electrode modified with Cu-MOF nanocomposite was utilized for the analysis of cyanide. The electrode showed good electrochemical performance and selectivity for CN- measurement, with results confirmed through various characterization techniques and methods. This method was successfully applied for the determination of CN- in different environmental water samples.
Carbon paste electrode (CPE) modified with porous copper based metal organic framework (Cu-MOF) nanocomposite is described for analysis of cyanide (CN-) for the first time. The electrochemical performance of the proposed electrode was investigated by differential pulse voltammetry (DPV), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The Cu-MOF nanocomposite was characterized using scanning electron microscope (SEM), N-2-adsorption-desorption isotherms, powder X-ray powder diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Under optimal conditions of measurements, the anodic peak (Ipa) decreases linearly in the range of 1.87-25 mu M with LOD of 0.60 mu M (at S/N = 3). The Cu-MOF/CPE showed good selectivity towards CN- measurement with no significant interference in pH 7.0 using 0.25 M KCl to increase the medium conductivity and to stabilize the analyte and prevents its volatility. Moreover, the method was successfully applied for determination of CN- in different environmental water samples.
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