A stable electrochemical sensor for the detection of ascorbic acid based on Fe3O4/ZrO2 nano composite modified carbon paste electrode

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Bulletin of the Chemical Society of Ethiopia Pub Date : 2024-07-12 DOI:10.4314/bcse.v38i5.2

Genet Bekele, Abebaw A. Tsegaye, Abi M. Taddesse, E. Teju

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Abstract

Magnetite and zirconium oxide (Fe3O4/ZrO2) nano composite, Fe3O4 and ZrO2 nanoparticles were synthesized by a chemical co-precipitation method and hydrothermal decomposition of zirconium metal organic framework, respectively. The structural and morphological properties of the as-synthesized materials were characterized by X-ray diffraction and scanning electron microscope. Electrochemical properties of carbon paste electrode (CPE) modified by Fe3O4, ZrO2 and Fe3O4/ZrO2 nano composites were studied using cyclic voltammetry and electrochemical impedance spectroscopy in the presence of 2 mM K3Fe(CN)6/0.1 M KCl aqueous solution. Voltammograms acquired on Fe3O4/ZrO2/CPE showed an enhancement of the oxidation current density compared to the other modified electrodes. By applying the Randles-Sevcik equation, the CPE modified by Fe3O4/ZrO2 nano composite resulted in an electroactive surface area of 0.0978 cm2; about twice to that of the unmodified CPE (0.0458 cm2). The electrochemical sensor was used for the detection of ascorbic acid (AA). Under optimized condition (pH 4) the sensor exhibits sensitivity of 10 µA/µM; LOD of 0.46 µM; LOQ of 1.53 µM and a linear range of 1-6 μM AA. The Fe3O4/ZrO2/CPE has also shown accepted reproducibility (% recoveries 93.54%); RSD of 2.4% and stable response of 96.91% of the initial current after 30 days of storage. KEY WORDS: Ascorbic acid, Carbon paste electrode, Electrochemical sensor, Nano composite Bull. Chem. Soc. Ethiop. 2024, 38(5), 1205-1223. DOI: https://dx.doi.org/10.4314/bcse.v38i5.2

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一种基于 Fe3O4/ZrO2 纳米复合修饰碳浆电极的检测抗坏血酸的稳定电化学传感器

分别采用化学共沉淀法和水热分解锆金属有机框架法合成了磁铁矿和氧化锆（Fe3O4/ZrO2）纳米复合材料、Fe3O4 和 ZrO2 纳米颗粒。通过 X 射线衍射和扫描电子显微镜对合成材料的结构和形态特性进行了表征。在 2 mM K3Fe(CN)6/0.1 M KCl 水溶液中，使用循环伏安法和电化学阻抗光谱法研究了由 Fe3O4、ZrO2 和 Fe3O4/ZrO2 纳米复合材料修饰的碳浆电极（CPE）的电化学特性。在 Fe3O4/ZrO2/CPE 上获得的伏安图显示，与其他改性电极相比，氧化电流密度有所提高。根据 Randles-Sevcik 方程，Fe3O4/ZrO2 纳米复合材料修饰的 CPE 的电活性表面积为 0.0978 cm2，约为未修饰 CPE（0.0458 cm2）的两倍。该电化学传感器用于检测抗坏血酸（AA）。在优化条件下（pH 值为 4），传感器的灵敏度为 10 µA/µM；LOD 为 0.46 µM；LOQ 为 1.53 µM，AA 的线性范围为 1-6 μM。Fe3O4/ZrO2/CPE还显示出良好的重现性（回收率为93.54%）；RSD为2.4%；储存30天后的稳定响应为初始电流的96.91%。关键字：抗坏血酸、碳浆电极、电化学传感器、纳米复合材料 Bull.Chem.Soc.2024, 38(5), 1205-1223. DOI: https://dx.doi.org/10.4314/bcse.v38i5.2

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来源期刊

Bulletin of the Chemical Society of Ethiopia 化学-化学综合

CiteScore

2.20

自引率

8.30%

发文量

113

审稿时长

6-12 weeks

期刊介绍： The Bulletin of the Chemical Society of Ethiopia (BCSE) is a triannual publication of the Chemical Society of Ethiopia. The BCSE is an open access and peer reviewed journal. The BCSE invites contributions in any field of basic and applied chemistry.