Voltammetric detection of bisphenol a by a chitosan–graphene composite modified carbon ionic liquid electrode

• Published in: Thin solid films Vol. 520; no. 13; pp. 4459 - 4464
• Main Authors: Wang, Qingxiang, Wang, Yuhua, Liu, Shengyun, Wang, Liheng, Gao, Feng, Gao, Fei, Sun, Wei
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.04.2012; Elsevier
• Subjects: Bisphenol A; Carbon ionic liquid electrode; Chemistry; Cross-disciplinary physics: materials science; rheology; Differential pulse voltammetry; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; General and physical chemistry; Graphene; Materials science; Physics; Specific materials; Bisphenol A; Carbon ionic liquid electrode; Graphene; Differential pulse voltammetry; Composite film; pH value; Carbon electrode; Electron transfer; Fluoroborates; Ionic liquid; Cyclic voltammetry; Electrochemical properties; Composite materials; Oxidation; Chitosan; Charge transfer
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2012.02.069

In this paper 1-ethyl-3-methylimidazolium tetrafluoroborate based carbon ionic liquid electrode (CILE) was fabricated and further modified with chitosan (CTS) and graphene (GR) composite film. The fabricated CTS-GR/CILE was further used for the investigation on the electrochemical behavior of bisphenol A (BPA) by cyclic voltammetry and differential pulse voltammetry. A well-defined anodic peak appeared at 0.436V in 0.1mol/L pH 8.0 Britton–Robinson buffer solution, which was attributed to the electrooxidation of BPA on the modified electrode. The electrochemical parameters of BPA on the modified electrode were calculated with the results of the charge transfer coefficient (α) as 0.662 and the apparent heterogeneous electron transfer rate constant (ks) as 1.36s−1. Under the optimal conditions, a linear relationship between the oxidation peak current of BPA and its concentration can be obtained in the range from 0.1μmol/L to 800.0μmol/L with the limit of detection as 2.64×10−8mol/L (3σ). The CTS-GR/CILE was applied to the detection of BPA content in plastic products with satisfactory results. ► A graphene modified carbon ionic liquid electrode was fabricated and characterized. ► Electrochemical behaviors of bisphenol A were investigated. ► Bisphenol A was detected by the proposed electrode.