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    Sonochemical synthesis and characterization of novel copper based metal-organic framework: Its application as electrochemical sensor for determination of Cd(II) ion in real water samples

    Year: 2023

    Journal: Inorganic Chemistry Communications, Volume 153, 2023-07-01, page 110733

    Authors: Eliwa, Ayman S.; Ali, Aya E.; Hosny, Wafaa M.; Mohamed, Gehad G.; Deghadi, Reem G.

    Keywords: BET analysis; Carbon paste electrode; Cd(II) ion; Cu-MOF; Powder X-ray diffraction (PXRD); SEM/EDX

    Metal organic frameworks (MOFs) are a type of porous material in which strong connections between organic linkers and metal ions are produced. MOFs can have a large pore volume, a big surface area, and great chemical stability if the ingredients are carefully chosen. So, using a sonochemical technique, a Cu (II) based metal–organic framework containing ligands obtained from 4-aminobenzoic acid and 2-carboxybenzaldehyde has been produced. Fourier-transform infrared spectroscopy (FT-IR), Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Brunauer-Emmett-Teller (BET), and thermal analysis were used to analyze the crystals generated. BET analysis revealed a surface area of 208.62 m2/g and a micropore diameter of 6.895 nm. The pores widths reached the meso range (2 nm pore diameter 50 nm), making it extremely useful in a variety of life applications. As a result, the newly synthesized Cu-MOF was used as an ionophore in a carbon paste electrode (CPE) to determine the concentration of Cd(II) in several real-world water samples. The proposed carbon paste electrode had a Nernstian slope of 29.89 ± 0.25 mV decade−1, covering a linear range of 5.0 × 10−7 – 1.0 × 10−1 mol L−1 with a detection limit of 3.17 × 10−7 mol L−1, and a quick response time of 5 s over a pH range of 3.0–6.5. The proposed sensor can be used for nearly 2 months without any divergence from Nernstian behavior. Successfully, the Cu-MOF modified CPE was applied for determination of Cd(II) ions with extreme selectivity and sensitivity and the obtained matched well with those obtained from atomic absorption spectroscopy (AAS).
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