Synthesis of Fe-based metal organic framework/MWCNTs for modification of glassy carbon electrode: application in the efficient stripping voltammetric determination of Pb(II) ions
Original scientific paper
DOI:
https://doi.org/10.5599/jese.3116Keywords:
Lead(II) ion detection, heavy metal analysis, electrochemical sensing platform, environmental monitoringAbstract
In the present work, a composite of multi-walled carbon nanotubes (MWCNTs) and Fe-based metal-organic framework (Fe-MOFs) has been prepared and utilized to construct modified glassy carbon electrodes (MGCE) by the drop-casting method. The MWCNTs/Fe-MOF-MGCE was used as a simple and sensitive electrochemical sensing platform for detecting Pb(II) ions. It has been found that modifying the GCE surface with MWCNTs/Fe-MOF significantly increased the Pb(II) stripping peak current. The effect of different parameters and conditions, such as pH of the supporting electrolyte solution, accumulation time and accumulation potential on the designed sensor's response, were evaluated. Square-wave anodic stripping voltammetry is used for the sensitive determination of Pb(II). Under optimal conditions, a linear dependence was observed between the anodic peak current of Pb(II) and its concentration in the range of 0.4 to 240.0 ng mL-1. The limit of detection of the MWCNTs/Fe-MOF/MGCE was determined to be 0.1 ng mL-1 for Pb(II) determination. Finally, the designed method was successfully used to determine Pb(II) ions in water samples, with high recoveries and low relative standard deviations, showing its applicability.
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Copyright (c) 2026 Rouaa A Muften, Mayada Hadi Al-qassi, Raed Muslim Muhibes
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