Electrochemical treatment of trypan blue synthetic wastewater and its degradation pathway

Abstract

The trypan blue (TB) dye synthetic wastewater was treated in presence of chloride ions by electrochemical method. The effect of current density, pH, initial concentration of dye and supporting electrolyte on color and COD removal were investigated. The UV-Vis absorption intensity, chemical oxygen demand (COD), cyclic voltammetry (CV), Fourier transforminfrared spectroscopy (FT-IR), gas chromatography-mass spectrometry (GC-MS) analysis were conducted to investigate the kinetics and degradation pathway of TB dye.

Anodic oxidation of oxytetracycline: Influence of the experimental conditions on the degradation rate and mechanism

“…Electrochemical processes have shown to be effective for the treatment of effluents containing refractory and toxic organic pollutants [38][39][40][41]. Furthermore, they are an effective, versatile, easy and clean technology [39,42].…”

Μελέτη Της Ηλεκτροχημικής Οξείδωσης Χρωμάτων Αντίδρασης Σε Υδατικά Συστήματα Και Πραγματικά Απόβλητα

“…Possibly, during the treatment the auxochromes from initial molecule were detached thus promoting the peak shift. The quick diminution of the band in UV range confirms the degradation of the aromatic compounds (Feng et al, 2000;Rao and Venkatesha, 2013).…”

“…The degradation process when higher Clconcentrations are present in the effluent, occurs with significant formation of Cl2 gas in concomitance with higher production of O2, complicating the complete oxidation of organic matter. Due to the difference of the standard reduction potential values for the Cl2/Cland HOCl/Cl2 couples are +1.36 V and +1.63 V, respectively, which is lower than that for •OH, H + /H2O (+2.7 V), the additional effect of chloride is neglected (Rao and Venkatarangaiah, 2013;Song et al, 2010).…”

“…It is obvious, that colour removal rate is higher than mineralization rate. From the other side increasing NaCl concentration has no influence on TOC or COD removal (Rao and Venkatesha, 2013;Song et al, 2010). The TOC removal was clearly higher for the BDD compared to the DSA electrode at any concentration of salt.…”

“…The optimum Clion concentration can facilitate high current efficiency and thus less energy consumption. At higher concentrations of Clions, the applied current density is efficiently utilized to generate more oxidants (Rao and Venkatarangaiah, 2013)…”