Abstract
Abstract TiO 2 electrode was used as photo-driven anode for oxygen reduction at carbon-felt cathode to produce H 2 O 2 used in the Fenton reaction to decompose an acid green 50 textile dye (AG50). The H 2 O 2 generated was catalyzed with ferrous ions in the photoelectroFenton process to decompose AG50 in cathode compartment. TiO 2 nanocomposite electrode was prepared by electrochemical anodization of pure Ti substrates. The results showed that TiO 2 anode exhibited a porous surface and organized nanotubes annealed at 450 °C and 600 °C with anatase phase, while a surface with less porous density with compact bars was obtained at 700 °C with anatase/rutile phase. The influence of applied bias potential, concentration of methanol in the anolyte, annealing temperature of TiO 2 nanocomposite and pH of the anolyte were studied on the photoelectrocatalytic degradation of methanol, whereas the catholyte composition remained unchanged for H 2 O 2 electrogeneration. Higher mineralization of both organic compounds was obtained by increasing the annealing temperature under acidic conditions using a bias potential of 1.02 V.
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