Graphite and its composites have gained considerable
attention in electrochemical applications due to their excellent structural,
electrical and chemical properties. In this study, a graphite paste electrode
(GPE) modified with natural Na-bentonite (BGPE) is fabricated and utilized for
the sensitive determination of Lanaset Red G (LRG) which is a kind of azo
containing metal complex dye. The BGPE shows excellent enhancement in peak
currents as compared to that of the GPE. The detection limit of LRG is
determined to be as low as 0.65±0.08 when utilizing the BGPE as the working
electrode in square wave voltammetry experiments (SWV). The electrochemical
behavior of LRG is also investigated using a cyclic voltammetry (CV) technique
to propose reaction mechanisms. Effects of pH and scan rate on the
electrochemical behavior of LRG are studied to calculate transfer coefficients,
the number of protons and electrons transferred in the redox reaction. The results
show that a quasi-reversible reaction occurs on the BGPE surface/electrolyte
interface. The morphology and the chemical characterization of both BGPE and
GPE electrodes are investigated by the atomic force microscopy (AFM) technique
and the diffuse reflectance infrared Fourier transform spectroscopy (DRIFT),
respectively.
Subjects | Engineering, Chemical Engineering |
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Journal Section | Articles |
Authors | |
Publication Date | September 11, 2017 |
Submission Date | August 17, 2017 |
Acceptance Date | September 11, 2017 |
Published in Issue | Year 2017 Volume: 4 Issue: 3 |