Synthesis of nanozeolites type A and X from quartz-rich Cameroonian kaolin: application to the modification of carbon paste electrode for acetaminophen and epinine electrochemical sensing.

Autor: Kemmegne-Mbouguen, Justin Claude, Tchoumi, Firmin Parfait
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Zdroj: Journal of Solid State Electrochemistry; Apr2023, Vol. 27 Issue 4, p939-953, 15p
Abstrakt: Nanozeolites A and X were synthesized via hydrothermal method using fine fraction of beneficiated clay. The beneficiation was achieved by collecting fine fraction of clay from high-quartz content Cameroon kaolin using Stoke's law principle. This treatment has led to a significant increase of kaolinite content of the clay (80%) as well as its crystallinity whereas the associated impurity decreased. The synthesized zeolites and its clay precursor were characterized by X-ray fluorescence, X-ray diffraction, scanning electron microscopy, and infrared spectroscopy as well as argon adsorption–desorption isotherm. The results have shown that the cubic crystal nanozeolite A and an octahedral-like crystal of nanozeolite X with average crystal size of 63 nm and 82 nm and surface area of 58 m2/g and 860 m2/g were obtained after shorter crystallization time: 2 and 12 h, respectively. The obtained nanozeolites were used to modify carbon paste electrode for the sensitive electrocatalytic detection of acetaminophen and epinine using LSV compared with the unmodified electrode after the study of the electrochemical behavior of both analytes at zeolites type A and X-modified electrodes. The hypothesis of extrazeolite mechanisms was proposed for the electrochemical pathway sensing of AC and EP at zeolite-modified electrodes. The oxidation peak current for both modified electrodes showed linear dependence on concentration range 0.5–70 μM with detection limit of 0.2 μM and 0.3 μM for AC and 0.08 μM and 0.2 μM for EP at ZX-CPE and ZA-CPE, respectively. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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