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Sensitive electrochemical detection of bisphenol A with chitosan and urchinlike MnO2 microsphere modified carbon ionic liquid electrode

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In this article, a carbon ionic liquid electrode (CILE) was fabricated by using ionic liquid N-hexylpyridinium hexafluorophosphate as the binder and the modifier. Then urchinlike MnO2 microsphere and chitosan (CTS) was further casted on the CILE surface step-by-step to get a modified electrode that was denoted as CTS/MnO2/CILE. Cyclic voltammetric studies indicated that bisphenol A (BPA) exhibited a well-defined oxidation peak at 0.486 V in 22.83 g L−1 pH 8.0 Britton‐Robinson buffer solution, which was attributed to the electro-oxidation of BPA on the modified electrode. The presence of urchinlike MnO2 microsphere on the electrode surface could increase the oxidation peak current (I pa) greatly, which may be due to the larger surface area that could adsorb more BPA on the electrode surface. Electrochemical parameters of BPA on the modified electrode were calculated with the electron transfer coefficient (α) as 0.66 and the apparent heterogeneous electron transfer rate constant (ks) as 0.50 s−1. Under the optimal conditions, a linear relationship between the I pa of BPA and its concentration was obtained in the range from 1.37 × 10–1 mg L−1 to 182.6 mg L−1 with the detection limit as 7.31 × 10–3 mg L−1 (3σ). The CTS/MnO2/CILE was applied to the detection of BPA content in different kinds of samples with satisfactory results.
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Keywords: N-hexylpyridinium hexafluorophosphate; bisphenol A; carbon ionic liquid electrode; electrochemistry; urchinlike MnO2 microsphere

Document Type: Research Article

Affiliations: 1: Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang, 330013, PR China 2: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, 571158, PR China

Publication date: August 9, 2015

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