Abstract

CARVALHO, D.A. et al. Application of electrochemical oxidation as alternative for removing methyl green dye from aqueous solutions. Lat. Am. appl. res. [online]. 2011, vol.41, n.2, pp.127-133. ISSN 0327-0793.

In this work, the treatment of synthetic wastewaters containing Methyl Green (MG) by anodic oxidation using Ti/PbO₂ anodes was investigated. Galvanostatic electrolyses of MG synthetic wastewaters have led to the complete decolourization removal at different current density values (10, 20 and 40 mA cm^-2), temperatures (25, 40 and 60°C) and agitation rate (100, 200 and 300 rpm). According to the experimental results obtained in this work, the electrochemical oxidation process is suitable for removing TOC and decolourising wastewaters containing MG dye, due to the electrocatalytic properties of Ti/PbO₂ anode. In general, the energy requirements for removing color during galvanostatic electrolyses of MG synthetic solutions depends mainly on the applied current density; it passes from 0.29 kWh at 10 mA cm^-2 to 1.64 kWh at 40 mA cm^-2 per volume of treated effluent removed (m^-3). The results are described and discussed in the light of the existing literature.

Keywords : Anodic Oxidation; Water Treatment; Decolourization; Lead Oxide Electrode.

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