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This paper presents the study on active chlorine mediated electrochemical oxidation of model solutions that simulate textile effluents containing an indigoid dye (indigo carmine) and sodium chloride (0.05 M) using a new Sb 2 O 5 -doped Ti/RuO 2 -ZrO 2  electrode. The study was carried out in a filter-press electrochemical reactor specially designed to minimize flow deviations and provide homogeneous mass transfer flux over the electrode surface. Firstly, the mass-transfer-limited chloride oxidation reaction was studied in the absence of dye in order to understand the active chlorine formation process. Changes in pH, chloride concentration and UV-visible absorption spectra during electrolysis reveal the formation of active chlorine (mainly hypochlorite) with current efficiencies for chloride oxidation of 0.558 and 0.503 at 10 and 20 mA cm −2 , respectively. Secondly, chloride oxidation was investigated in the presence of indigo carmine dye (0.5 mM) where  in-situ  generated active chlorine was responsible for -C=C- bond breaking and dye degradation. The solution discoloration followed a pseudo-first order kinetics where kinetic coefficient was inversely proportional to dye concentration. The oxidation with active chlorine had an average efficiency of 0.7 and a very competitive energy consumption between 49.2 and 128.5 kW h (kg COD removed) −1  depending on current density and flow rate.

international journal of chemical reactor engineering

Electrogeneration of Active Chlorine in a Filter-Press-Type Reactor Using a New Sb 2 O 5  Doped Ti/RuO 2 -ZrO 2  Electrode: Indirect Indigoid Dye Oxidation