Electrochemical Detection of Bisphenol A Using Graphene-Modified Glassy Carbon Electrode

Ntsendwana, B and Mamba, BB and Sampath, S and Arotiba, OA (2012) Electrochemical Detection of Bisphenol A Using Graphene-Modified Glassy Carbon Electrode. In: INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, 7 (4). pp. 3501-3512.

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Abstract

Graphene's nano-dimensional nature and excellent electron transfer properties underlie its electrocatalytic behavior towards certain substances. In this light, we have used graphene in the electrochemical detection of bisphenol A. Graphene sheets were produced via soft chemistry route involving graphite oxidation and chemical reduction. X-ray diffraction, Fourier transform infra-red (FT-IR) and Raman spectroscopy were used for the characterization of the as-synthesized graphene. Graphene exhibited amorphous structure in comparison with pristine graphite from XRD spectra. FTIR showed that graphene exhibits OH and COOH groups due to incomplete reduction. Raman spectroscopy revealed that multi-layered graphene was produced due to low intensity of the 2D-peak. Glassy carbon electrode was modified with graphene by a simple drop and dry method. Cyclic voltammetry was used to study the electrochemical properties of the prepared graphene-modified glassy carbon electrode using potassium ferricyanide as a redox probe. The prepared graphene- modified glassy carbon electrode exhibited more facile electron kinetics and enhanced current of about 75% when compared to the unmodified glassy carbon electrode. The modified electrode was used for the detection of bisphenol A. Under the optimum conditions, the oxidation peak current of bisphenol A varied linearly with concentration over a wide range of 5 x 10(-8) mol L-1 to 1 x 10(-6) mol L-1 and the detection limit of this method was as low as 4.689 x 10(-8) M. This method was also employed to determine bisphenol A in a real sample

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Publisher:	ELECTROCHEMICAL SCIENCE GROUP
Additional Information:	Copyright for this article belongs to ELECTROCHEMICAL SCIENCE GROUP, A SPOMENICE 7/12 , 19210 BOR, BELGRADE, VJ 12, SERBIA
Keywords:	graphene;bisphenol A;electrochemical detection;glassy carbon electrode;differential pulse voltammetry
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	25 Jun 2012 12:49
Last Modified:	26 Jun 2012 11:42
URI:	http://eprints.iisc.ac.in/id/eprint/44747

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