Electrochemical Treatment of C.I. Reactive Black 5 Solutions on Stabilized Doped Ti/SnO₂ Electrodes

摘要

The electrochemical treatment of wastewaters from the textile industry is a promising technique forsubstances which are resistant to biodegradation. This paper deals with the electrochemicaldecolourisation and degradation of synthetic solutions containing a bifunctional reactive dye with ahigh molecular complexity: C.I. Reactive Black 5. The electrolysis was carried out under galvanostaticconditions employing a filter press reactor with two different configurations. A divided filter pressreactor (D-FPR) to study only the oxidation process and an undivided filter press reactor (UD-FPR) tostudy the oxido-reduction process. All the processes were evaluated using Ti/SnO2bt and stainlesssteel electrodes as anode and cathode, respectively. The decolourisation and degradation of the dyewere tracked by means of total organic carbon (TOC), chemical oxygen demand (COD)measurements, UV-Visible spectroscopy, as well as high performance liquid chromatography (HPLC).The kinetics of decolourisation was of pseudo-first order for both processes. Average Oxidation State(AOS), Carbon Oxidation State (COS) and Average Current Efficiency (ACE) were also determined.