Electrochemical sensor based on corncob biochar layer supported chitosan-MIPs for determination of dibutyl phthalate (DBP)

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2021-09, Vol.897, p.115549, Article 115549
• Main Authors: Zhou, Qingteng, Guo, Ming, Wu, Shenchun, Fornara, Dario, Sarkar, Binoy, Sun, Liping, Wang, Hailong
• Format: Article
• Language: English
• Subjects: Chemical sensors; Chitosan; Crosslinking; Dibutyl phthalate; Electrical resistivity; Electrochemical impedance spectroscopy; Electrochemical sensor; F-CC3; Glassy carbon; Imprinted polymers; Interlayers; Materials selection; Molecular imprinting; Molecularly imprinted polymer; Selectivity; Sensors; Voltammetry
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2021.115549

The new corncob biochar layer supported chitosan-based molecular imprinting electrochemical sensor was successfully prepared. Compared with the bare electrode, the new sensor had a good imprinted effect. [Display omitted] •A MIP-DBP-CTS/F-CC3/GCE novel senor was prepared by molecular imprinting.•The sensor combined the advantages of F-CC3 and MIP achieved high sensitivity and selective detection of DBP.•The sensor for DBP exhibits a low detection limit of 2.6 nM.•The designed sensor was successfully applied to DBP detection in rice wine purchased in the market. A highly selective and sensitive electrochemical sensor (MIP-DBP-CTS/F-CC3/GCE) for dibutyl phthalate (DBP) detection was prepared. Firstly the functional corncob biochar (F-CC3) was cast on a glassy carbon electrode (GCE) to form F-CC3 film. Then, the pretreated GCEs were further modified by molecularly imprinted polymers synthesized with CTS as functional monomer, DBP as the template molecule, glutaraldehyde as the crosslinking agent. The MIP-DBP-CTS/F-CC3/GCE sensor was characterized by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). The results showed that the utilization of conductive F-CC3 as interlayer spacers efficiently inhibited the aggregation of CTS and formed a well-defined porous structure, as a result of increasing the effective surface area, an enhancement of the electrical conductivity was observed. This sensor takes advantages of molecularly imprinted technique and F-CC3 biomass materials to achieve high selectivity and high sensitivity for the determination of DBP. The as-prepared molecular imprinting sensor, under the optimized conditions, presented a good linear relationship (R2 = 0.9929) between the response current ΔI and the DBP concentration ranging of 0 ~ 1.8 μM with a limit of detection (LOD) of 0.0026 μM. Besides, this newly developed sensor was utilized for the detection of DBP in rice wine purchased in the market with satisfactory results.