Electrochemical oxidation of reactive dyes: method validation and application

Abstract

Electrochemical oxidation is a very effective technique for wastewater processing and, in the textile industry, it can be employed to remove colour from residual dyeing and washing liquors. In previous studies, the main factors were established for the control of the electrochemical removal of reactive dyes from textile wastewater. Mathematical models were proposed for the decolorisation of these dyes and for the electrical consumption. In the present work, these models are analysed and a three‐step methodology is established in order to determine whether a dye can be removed from wastewater by electrochemical treatment. This methodology is applied and verified on a further four reactive dyes. The mathematical models are also employed to evaluate the colour removal from textile wastewater samples containing reactive dyes.

Study of the electrochemical oxidation and reduction of C.I. Reactive Orange 4 in sodium sulphate alkaline solutions

“…Then, an extensive range of electrolytes have been employed such as H 2 SO 4 [32,33], KNO 3 [34], HClO 4 [27], NaF [32], Na 2 SO 4 [17,[35][36][37][38][39][40][41] and NaCl (or KCl) [35][36][37][41][42][43][44][45][46][47][48][49]. From all these supporting electrolytes, the role of chloride is important since the colour removal and degradation degree of azo dyes obtained may be enhanced.…”

Application of graphene quantum dots as green homogenous nanophotocatalyst in the visible-light-driven photolytic process

“…Therefore, the active sites of nano-catalyst (GQDs) were occupied by the dye molecules, reducing the degradation eiciency of CB dye. On the other hand, the increase in the dye species led to a reduction in the number of photons that reach the surface of the GQDs nano-catalyst [42] …”

Effect of Initial Azo Dye Concentration and Biomass Acclimation on Sludge Digestion and Dye Co‐treatment

“…This was followed by monitoring CH 4 and CO 2 productions in the reactors. The biogas production in the reference reactor, which only contained WS and the seed, served as a reference for biogas yield comparisons.…”