Photoelectrocatalytic degradation of indanthrene blue dye using Ti/Ru-based electrodes prepared by a modified Pechini method

摘要

Photoelectrodes were used to treat synthetic textile wastewater contaminated with indanthrene blue dye. Two media of treatment were used (NaCl and Na_2SO_4), with variations on temperature, pH, current density, dye and chloride concentration. A modified Pechini method was applied to obtain Ti/Ru-based electrodes (Ti, Ru, Ti_(0.5)Ru_(0.5), Ti_(0.75)Ru_(0.25) and Ti_(0.25)Ru_(0.75)) containing anatase TiO_2 nanoparticles and a color degradation analysis was done. Physical (atomic force microscopy and X-ray diffractometry) and electrochemical characterizations (cyclic voltammetry) were considered. The condition that yielded highest color removal for the system presented 0.05 mol L~(-1) NaCl, 100 mA cm~(-2), 35 °C and pH 7, independent of the dye concentration for the Ti_(0.25)Ru_(0.75) electrode.