Electrochemistry and sensitive determination of a metal complex azo dye using graphite paste electrode modified with Na-bentonite

Authors : SINEM ORTABOY

Pages : 931-952

Doi:10.18596/jotcsa.334999

View : 40 | Download : 9

Publication Date : 2017-09-11

Article Type : Research Paper

Abstract :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 insert ignore into journalissuearticles values(GPE); modified with natural Na-bentonite insert ignore into journalissuearticles values(BGPE); is fabricated and utilized for the sensitive determination of Lanaset Red G insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(SWV);. The electrochemical behavior of LRG is also investigated using a cyclic voltammetry insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(AFM); technique and the diffuse reflectance infrared Fourier transform spectroscopy insert ignore into journalissuearticles values(DRIFT);, respectively.
Keywords : Voltammery, sensitive determination, bentonite, azo dye, graphite

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