Determination of chloropropanol with an imprinted electrochemical sensor based on multi-walled carbon nanotubes/metal–organic framework composites. Issue 30 (21st May 2021)

• Record Type: Journal Article
• Authors: Han, Shuang; Ding, Yuxin; Teng, Fu; Yao, Aixin; Leng, Qiuxue
• Is Part Of: RSC advances. Volume 11:Issue 30(2021)
• Page Start: 18468
• Page End: 18475
• Publication Date: 2021-05-21
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra02731j
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this study, cMWCNT/MOF-199 composites were used as the modified electrodes, and a MIECS having specific recognition of 3-MCPD was prepared by electrochemical polymerization for selective analysis of 3-MCPD in foodstuffs. Abstract : In this paper, a composite composed of carboxylated multi-wall carbon nanotubes (cMWCNT) incorporated in a metal–organic framework (MOF-199) has been synthesized using 1, 3, 5-benzoic acid as a ligand through a simple solvothermal method. The synthesized cMWCNT/MOF-199 composite was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffractometry (XRD). The cMWCNT/MOF-199 hybrids were modified on the surface of glassy carbon electrodes (GCE) to prepare a molecularly imprinted electrochemical sensor (MIECS) for specific recognition of 3-chloro-1, 2-propanediol (3-MCPD). The electrodes were characterized by differential pulse voltammetry (DPV), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Under optimal conditions, the electrochemical sensor exhibited an excellent sensitivity and high selectivity with a good linear response range from 1.0 × 10 −9 to 1.0 × 10 −5 mol L −1 and an estimated detection limit of 4.3 × 10 −10 mol L −1 . Furthermore, this method has been successfully applied to the detection of 3-MCPD in soy sauce, and the recovery ranged from 96% to 108%, with RSD lower than 5.5% ( n = 3), showing great potential for the selective analysis of 3-MCPD in foodstuffs.