Actividad fotocatalítica de polvo de nanotubos de TiO2 anódico – Primeros resultados

TiO2 nanotubes powder were synthesized by mechanical detachment of TiO2 coatings obtained by anodic oxidation of titanium plates, using a solution of ethylene glycol, NH4F and H2O as electrolyte, at 80 V for 1 h. The morphology of the nanotubes was observed by scanning electron microscopy (SEM) and the crystalline phases by X-ray diffraction (XRD). The photocatalytic activity was evaluated using a solution of [EDTA]/[Cr(VI)] = 1.25 at pH 2 as a model contaminant. The system was irradiated with UV light and a Cr(VI) transformation of 70% was obtained after 5 h of irradiation.