多壁碳纳米管增强金属有机框架修饰的电化学传感器用于肉类中镉离子的快速检测

Rapid detection of cadmium ions in meat by a multi-walled carbon nanotubes enhanced metal-organic framework modified electrochemical sensor.

作者信息

Wang Xin, Xu Yiwei, Li Yahui, Li Yanxiao, Li Zhihua, Zhang Wen, Zou Xiaobo, Shi Jiyong, Huang Xiaowei, Liu Chao, Li Wenting

机构信息

Agricultural Product Processing and Storage Lab, School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; China-UK Joint Laboratory for Nondestructive Detection of Agro-products, Jiangsu University, Zhenjiang, Jiangsu 212013, China; Center of Analysis and Test, Jiangsu University, Zhenjiang, Jiangsu 212013, China.

出版信息

Food Chem. 2021 Apr 9;357:129762. doi: 10.1016/j.foodchem.2021.129762.

DOI:10.1016/j.foodchem.2021.129762

PMID:33872870

Abstract

This work presents an electrochemical device based on a composite modification of amine functionalized Zr(IV) metal-organic framework (UiO-66-NH) and multi-walled carbon nanotubes (MWCNTs) for voltammetry determination of cadmium ions (Cd). The UiO-66-NH@MWCNTs composites were prepared by one-pot hydrothermal reaction. The prepared sensor performs excellent performance, which was attributed to the synergism between UiO-66-NH with a special octahedral structure and enlarged surface area and MWCNTs with outstanding conductivity. Under optimal experiment condition, the fabricated sensor showed good linear relationship from 0.5 to 170 μg/L, with a detection limit of 0.2 μg/L. Finally, the sensor was successfully applied to detect Cd in meat samples (N = 21) with relative standard deviation (RSD) lower than 4.5% and recovery of 95.1-107.5%, and the results were compared with certified method, there was no statistical significance difference between the developed sensor and certified method at a 95% confidence level.

摘要

本工作提出了一种基于胺功能化锆（IV）金属有机框架（UiO-66-NH）和多壁碳纳米管（MWCNTs）复合修饰的电化学装置，用于伏安法测定镉离子（Cd）。通过一锅水热反应制备了UiO-66-NH@MWCNTs复合材料。所制备的传感器表现出优异的性能，这归因于具有特殊八面体结构和增大表面积的UiO-66-NH与具有出色导电性的MWCNTs之间的协同作用。在最佳实验条件下，所制备的传感器在0.5至170μg/L范围内呈现良好的线性关系，检测限为0.2μg/L。最后，该传感器成功应用于检测肉类样品（N = 21）中的Cd，相对标准偏差（RSD）低于4.5%，回收率为95.1 - 107.5%，并将结果与标准方法进行比较，在95%置信水平下，所开发的传感器与标准方法之间无统计学显著差异。