Smartphone-based portable sensor with Bi-MOF nanocomposite for Cd (II) in vegetable samples

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-09-28 DOI:10.1016/j.jelechem.2024.118681

Liping Deng , Liangmei Rao , Xinyu Lu , Yutang Wang , Weiming Zhang , Xuemin Duan , Yangping Wen , Zhuohua Kong , Jingkun Xu

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Abstract

The accumulation of heavy metal cadmium (Cd) in the food chain poses a serious threat to human health, necessitating the development of rapid, on-site, and portable detection methods for Cd (II). Herein, we developed a smartphone-based electrochemical sensor for portable determination of Cd (II) in vegetables using a bismuth metal–organic framework (Bi-MOF) nanocomposite. Prismatic rod-like Bi-MOF was hydrothermally synthesized using trimesic acid as organic ligands, and subsequently, carboxyl-functionalized multi-walled carbon nanotubes (COOH-MWCNTs) were incorporated to form Bi-MOF nanocomposite network. The smartphone-based electrochemical sensor enables rapid, sensitive, and portable detection of Cd (II) in vegetable samples using Bi-MOF/COOH-MWCNTs-modified screen-printed carbon electrodes (SPCE). A comparative analysis of traditional electrochemical sensors coupled with desktop computer for linear voltametric responses for Cd (II) in the range of 0.2–500 ng/mL with a limit of detection (LOD) of 0.07 ng/mL using Bi-MOF/COOH-MWCNTs-modified glassy carbon electrodes (GCE), the portable sensor demonstrated good linear range in 0.7–350 ng/mL with a LOD of 0.22 ng/mL. This work introduces a novel approach for on-site and portable detection of Cd (II) in agricultural products.

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基于智能手机的便携式传感器与 Bi-MOF 纳米复合材料，用于检测蔬菜样品中的镉 (II)

重金属镉（Cd）在食物链中的积累对人类健康构成了严重威胁，因此有必要开发快速、现场和便携的镉(II)检测方法。在此，我们利用铋金属有机框架（Bi-MOF）纳米复合材料开发了一种基于智能手机的电化学传感器，用于便携式检测蔬菜中的镉（II）。以三羟甲基氨基甲酸为有机配体，水热合成了棱柱杆状的 Bi-MOF，然后将羧基官能化的多壁碳纳米管（COOH-MWCNTs）加入其中，形成 Bi-MOF 纳米复合网络。这种基于智能手机的电化学传感器利用 Bi-MOF/COOH-MWCNTs 修饰的丝网印刷碳电极 (SPCE) 实现了对蔬菜样品中镉 (II) 的快速、灵敏和便携式检测。使用 Bi-MOF/COOH-MWCNTs 改性的玻璃碳电极（GCE）对传统电化学传感器和台式计算机进行了比较分析，结果表明，该便携式传感器在 0.2-500 纳克/毫升范围内对镉 (II) 具有线性伏安响应，检出限为 0.07 纳克/毫升；在 0.7-350 纳克/毫升范围内具有良好的线性响应，检出限为 0.22 纳克/毫升。这项工作为现场和便携式检测农产品中的镉（II）引入了一种新方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.