CuBi<sub>2</sub>O<sub>4</sub> Synthesis, Characterization, and Application in Sensitive Amperometric/Voltammetric Detection of Amoxicillin in Aqueous Solutions

CuBi<sub>2</sub>O<sub>4</sub> synthesized by thermolysis of a new Bi(III)-Cu(II) oxalate coordination compound, namely Bi<sub>2</sub>Cu(C<sub>2</sub>O<sub>4</sub>)<sub>4</sub>·0.25H<sub>2</sub>O, was tested through i...

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Bibliographic Details
Main Authors: Raluca Dumitru (m.Vodă), Sorina Negrea, Cornelia Păcurariu, Adrian Surdu, Adelina Ianculescu, Aniela Pop, Florica Manea
Format: Article
Language:English
Published: MDPI AG 2021-03-01
Series:Nanomaterials
Subjects:
Online Access:https://www.mdpi.com/2079-4991/11/3/740
Description
Summary:CuBi<sub>2</sub>O<sub>4</sub> synthesized by thermolysis of a new Bi(III)-Cu(II) oxalate coordination compound, namely Bi<sub>2</sub>Cu(C<sub>2</sub>O<sub>4</sub>)<sub>4</sub>·0.25H<sub>2</sub>O, was tested through its integration within carbon nanofiber paste electrode, namely CuBi/carbon nanofiber (CNF), for the electrochemical detection of amoxicillin (AMX) in the aqueous solution. Thermal analysis and IR spectroscopy were used to characterize a CuBi<sub>2</sub>O<sub>4</sub> precursor to optimize the synthesis conditions. The copper bismuth oxide obtained after a heating treatment of the precursor at 700 °C/1 h was investigated by an X-ray diffraction and scanning electron microscopy. The electrochemical behavior of CuBi/CNF in comparison with CNF paste electrode showed the electrocatalytic activity of CuBi<sub>2</sub>O<sub>4</sub> toward amoxicillin detection. Two potential detections, with one at the potential value of +0.540 V/saturated calomel electrode (SCE) and the other at the potential value of −1.000 V/SCE, were identified by cyclic voltammetry, which were exploited to develop the enhanced voltammetric and/or amperometric detection protocols. Better electroanalytical performance for AMX detection was achieved for CuBi/CNF using differential-pulsed and square-wave voltammetries than others reported in the literature. Very nice results obtained through anodic and cathodic currents recorded at +0.750 V/SCE and −1.000 V/SCE in the same time period using a pseudo multiple-pulsed amperometry technique showed the great potential of the CuBi/CNF paste electrode for practical applications in amoxicillin detection in aqueous solutions.
ISSN:2079-4991