TRATAMIENTO ELECTROQUÍMICO DE COLORANTES BIFUNCIONALES TIPO HEXL EN UNA CÉLULA FILTRO PRENSA.

Autores UPV
Año
Revista Dyna

Abstract

In the present work, the electrochemical treatment of reactive bifunctional dyes is investigated. The selected dyes correspond to the tricromy HEXL. These dyes present two azo groups as chromophore groups and two monochlorotriazinic groups as reactive groups. This study has been carried out in two parts: in the fi rst part, synthetic solutions containing just one of these dyes, Procion HEXL, were studied (Solution (1)). Previous investigations have demonstrated that the best process to carry out this study is the oxidoreduction at 125 mA cm-2. Following to this fi rst part, the same study in the same working conditions was performed with solutions containing the three dyes of the tricromy H-EXL (Procion Yellow HEXL, Procion Crimson HEXL and Procion Navy HEXL). In this last case, the concentrations were selected considering the concentrations found in real effluents. In order to evaluate the decoloration/mineralization obtained, Total Organic Carbon (TOC) and the Chemical Oxygen Demand (COD) were measured. These parameters allowed to know the Average Oxidation State (AOS) after each electrolysis and the effi ciency at which the process takes place by means of calculating the Carbon Oxidation State (COS) and The Average Current Effi ciency (ACE). The UV-Visible spectroscopy permitted to observe the decoloration differences between the initial and fi nal stage. Moreover, the High Performance Liquid Chromatography (HPLC) gave information about the intermediates generated as well as the decoloration kinetics.