voltammetric redox behaviour and electrochemical degradation of reactive red 2 dye

Research Article
Clara Anthoniamma, S and *Gurumallesh Prabu, H
DOI: 
xxx-xxxx-xxx
Subject: 
science
KeyWords: 
Reactive azo dye, Voltammetry, Decolourization, Solubilizing groups.
Abstract: 

The removal of synthetic azo dyes has become an environmental challenge due to its hazardous effects on animal and human being. The aim of this work was to study the voltammetric redox behaviour of a azo dye Reactive Red 2 (RR2) and its removal by electrochemical method using graphite electrodes at room temperature. In the cyclic voltammetric (CV) study, the potential window was in the range between -1.0 V and +1.0 V. The effects of pH, scan rate and dye concentration were studied. The electrochemical reaction pathway of the electroactive chromophoric group was derived. This azo dye with a hydroxyl group in the ortho position with respect to the N=N group exhibited a well defined irreversible redox peaks in the pH range between 1 and 13. The CV results indicated that the electrode process was adsorption controlled. The number of electrons transferred in the redox process was calculated from the controlled potential electrolysis experiment. The dye was then subjected to electrochemical degradation by applying DC power supply with graphite electrodes. Complete decolourization was observed after two hours of electrolysis. The electrolyzed solution was subjected to UV-Visible and FT-IR analyses. UV-vis spectra showed a peak that corresponds to the diene structure. FT-IR results showed that the solubilising groups attached to the ring play a major role in the degradation of azo dye