Treatment of aqueous and simulated wastewater of Luganil blue N dye – a new electrochemical approach

Abstract

Treatment of aqueous solution containing Luganil blue N (LBN) azo dye was performed by an electrochemical method under galvanostatic conditions using an undivided cell with platinum electrodes as working and auxiliary electrodes and standard calomel as the reference electrode. The aqueous solution of NaCl was used as the supporting electrolyte. Preliminary voltammetric studies were performed to establish the mode of degradation process. The effect of polarity of the electrode on degradation and decolouration rate was studied. The effect of the supporting electrolytes, concentration of NaCl, electrolysis time, solution pH and initial dye concentration on degradation rate were evaluated. The optimized operating conditions were used for the treatment of simulated wastewater containing LBN dye. The electrolysis process was monitored by an ultraviolet-visible spectrophotometer and measuring the chemical oxygen demand of the electrolysed solutions. The degradation products were identified using gas chromatograph/mass spectrometry studies, and a suitable mechanism for the LBN dye degradation was proposed.

Studies on degradation of triphenylmethane dye crystal violet by electro‐flotation device

“…It might be that the indirect oxidation of electrolytes plays a great role in the electrolytic oxidation process. [ 45 ] In the initial stage of electrolysis, the amount of anodic oxidation material was small, and the degradation rate of dyes might be controlled by the rate of oxidation material. When there were excess oxidizing substances in the electrolyte, the degradation rate of dyes might be mainly controlled by the homogeneous reaction rate of oxides and dyes.…”