Construction of a waste-derived graphite electrode integrated IL/Ni-MOF flowers/Co3O4 NDs for specific enrichment and signal amplification to detect aspartame

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2024-10-28 DOI:10.1016/j.colsurfa.2024.135648

Manju Manuel, Suvardhan Kanchi

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引用次数: 0

Abstract

A novel and cost-efficient electrochemical sensor was designed by immobilizing IL/Ni-MOF/Co₃O₄ nanodiamonds on the graphite (GE) electrode, marking the first application for the detection of aspartame. The graphite electrode was extracted and recycled from discharged batteries to serve as a working electrode. The nanocomposite features unique Co₃O₄ nanodiamonds, generated using Coriandrum sativum seed extract, alongside Ni-metal organic framework (MOF), which were synthesized through a solvothermal method. The conductivity and stability of the electrochemical sensor were enhanced through the incorporation of the ionic liquid (IL) ([BMIM][MeSO₄]. The phytochemical profile of Coriandrum sativum seed extract, analyzed by GC-MS, identified key compounds involved in the synthesis of Co₃O₄ nanodiamonds. A comprehensive characterization of the nanocomposite was performed using UV-Vis, FTIR, DLS, Zeta potential, XRD, XPS, FE-SEM, TEM, optical profilometry, and AFM to confirm the structural and elemental modifications. Electrochemical characterization of the bare and modified electrodes was conducted through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The GE/IL/Ni-MOF/Co₃O₄ nanodiamonds modified electrode displayed enhanced electroanalytical performance for aspartame detection, characterized by signal amplification at +7.0 V. Quantitative analysis by Differential Pulse Voltammetry (DPV) and Square Wave Voltammetry (SWV) revealed a linear detection range of 3–15 µM for aspartame. A comparison of SWV and DPV revealed superior analytical performance for SWV, with limit of detection (LOD) and limit of quantification (LOQ) values of 1.02 µM and 3.1 µM (R² = 0.993) compared to 1.81 µM and 5.5 µM (R² = 0.986) for DPV. This study reveals the excellent adsorption capabilities of Ni-MOF and Co₃O₄ nanodiamonds (Co₃O₄ NDs), attributed to their high porosity and large surface area, paving the way for the development of affordable sensing devices for artificial sweeteners.

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构建集成了 IL/Ni-MOF 花/Co3O4 ND 的废物衍生石墨电极，用于检测阿斯巴甜的特异性富集和信号放大

通过在石墨（GE）电极上固定 IL/Ni-MOF/Co3O4 纳米金刚石，设计出了一种新颖且具有成本效益的电化学传感器，首次应用于阿斯巴甜的检测。石墨电极是从放电电池中提取并回收的，用作工作电极。这种纳米复合材料具有独特的 Co3O4 纳米金刚石（使用芫荽籽提取物生成）和镍金属有机框架（MOF），后者是通过溶热法合成的。离子液体（IL）（[BMIM][MeSO4]）的加入增强了电化学传感器的导电性和稳定性。利用 GC-MS 分析了芫荽种子提取物的植物化学成分，确定了参与 Co3O4 纳米金刚石合成的关键化合物。利用紫外可见光、傅立叶变换红外光谱、DLS、Zeta 电位、XRD、XPS、FE-SEM、TEM、光学轮廓仪和原子力显微镜对纳米复合材料进行了全面表征，以确认其结构和元素修饰。通过循环伏安法（CV）和电化学阻抗谱法（EIS）对裸电极和改性电极进行了电化学表征。经修饰的 GE/IL/Ni-MOF/Co3O4 纳米金刚石电极在检测阿斯巴甜方面显示出更强的电分析性能，其特点是在 +7.0 V 时信号放大。利用差分脉冲伏安法（DPV）和方波伏安法（SWV）进行的定量分析显示，阿斯巴甜的线性检测范围为 3-15 µM。对 SWV 和 DPV 进行比较后发现，SWV 的分析性能更优越，其检测限 (LOD) 和定量限 (LOQ) 值分别为 1.02 µM 和 3.1 µM (R2 = 0.993)，而 DPV 的检测限和定量限值分别为 1.81 µM 和 5.5 µM (R2 = 0.986)。这项研究揭示了 Ni-MOF 和 Co3O4 纳米金刚石（Co3O4 NDs）的高孔隙率和大表面积所带来的卓越吸附能力，为开发经济实惠的人工甜味剂传感设备铺平了道路。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.