Flexible carbon fiber cloth supports decorated with cerium metal- organic frameworks and multi-walled carbon nanotubes for simultaneous on-site detection of Cd2+ and Pb2+ in food and water samples

• Published in: Food chemistry 2023-08, Vol.418, p.135869-135869, Article 135869
• Main Authors: Dong, Jiangbo, Wen, Li, Zhao, Dong, Yang, Huisi, Zhao, Jiaying, Hu, Zhikun, Ma, Yi, Hou, Changjun, Huo, Danqun
• Format: Article
• Language: English
• Subjects: CeMOF; Electrochemical sensor; Environmental monitoring; Flexible electrode; Food safety
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2023.135869

•The sensor platform is easy to be popularized in areas with limited resources.•MWCNTs and CeMOF synergistically improve the sensitivity of sensor electrodes.•The strategy has potential in on-site detection of heavy metals in food and water. The widespread heavy metal pollution endangers human health; hence, accurate on-site detection and quantification of heavy metal content in the surroundings is a vital step in reversing the harmful effect. Herein, an electrochemical sensor based on flexible cerium metal–organic framework@multi-walled carbon nanotubes/carbon cloth (CeMOF@MWCNTs/CC) was constructed for simultaneous on-site detection of Cd2+ and Pb2+ in food and water samples. The rich carboxyl groups of MWCNTs provided abundant sites for the adsorption of Cd2+ and Pb2+, and the mutual conversion of Ce3+ and Ce4+ in CeMOF facilitated the reduction and reoxidation of metal ions. The prepared electrode showed excellent performance in the simultaneous measurement of Cd2+ and Pb2+, with detection limits of 2.2 ppb and 0.64 ppb, respectively. More importantly, the sensing platform has been successfully used to detect simultaneously Cd2+ and Pb2+ in grain and water samples, and the detection results were consistent with the standard methods, showing great potential in environmental monitoring and food safety.