Development and evaluation of gas diffusion electrodes (GDE) for generation of H_2O_2 in situ and their application in the degradation of reactive blue 19 dye [Desenvolvimento e avalia??o de eletrodos de difus?o gasosa (EDG) para gera??o de H_2O_2 in situ e sua aplica??o na degrada??o do corante reativo azul 19]

摘要

This work reports the development of GDE for electrogeneration of H_ 2O_2 and their application in the degradation process of Reactive Blue 19 dye. GDE produced by carbon black with 20% polytetrafluoroethylene generated up to 500 mg L-1 of H_ 2O_2 through the electrolysis of acidic medium at -0.8 V vs Ag/AgCl. Reactive Blue 19 dye was degraded most efficiently with H_ 2O_2 electrogenerated in the presence of Fe(II) ions, leading to removal of 95% of the original color and 39% of TOC at -0.8 V vs Ag/AgCl.