Physical-chemical and electrochemical characterization of Fe-exchanged natural zeolite applied for obtaining of hydrogen peroxide amperometric sensors |
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| Institution: | 1. Research Laboratory, IBIMA, Regional University Hospital of Malaga, UMA, Plz. del Hospital Civil s/n, 29009 Malaga, Spain;2. Andalusian Centre for Nanomedicine and Biotechnology — BIONAND, C/Severo Ochoa 35, 29590, Campanillas, Malaga, Spain;3. Department of Organic Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain;4. Laboratory of Cellular and Molecular Pathology in Nutrition, Faculty of Medicine, University of Nancy, 9 avenue de la Forêt de Haye, B.P. 184, 54505 Vandoeuvre-les-Nancy Cedex, France;5. Allergy Unit, IBIMA, Regional University Hospital of Malaga, UMA, Plza. Hospital Civil s/n, 29009 Málaga, Spain |
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| Abstract: | This work demonstrates that a Fe-exchanged zeolitic volcanic tuff from Cepari (Fe/CV) (Bistrita-Nasaud County, Romania) is suitable for the amperometric detection of H2O2, using new modified carbon paste electrodes based on this material (Fe/CV-CPEs). The physical-chemical characterization of natural (CV) and modified (Fe/CV) forms was realized using chemical analysis, optical microscopy, scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), energy dispersive X-ray spectroscopy (EDX) and Fourier transformed infrared (FTIR) spectroscopy. The resulting electrodes (Fe/CV-CPEs) were investigated using cyclic voltammetry and chronoamperometry measurements. The new electrodes showed good electrocatalytic activity toward H2O2 reduction. The calibration curve for H2O2 determination was linear up to 0.1 mM, with a detection limit (signal to noise ratio of 3) of 20 μM. |
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| Keywords: | Zeolitic volcanic tuff Carbon paste electrodes Hydrogen peroxide |
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