TiO2 NANOTUBES FOR PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE

Titanium dioxide remains one of the most studied semiconductor for photocatalytic applications due to its low cost production, reduced toxicity, ability break down organic pollutants and possibility achieve complete mineralization. In this work, we report on results activity titanium nanotubes fabricated by electrochemical anodization technique in an electrolyte solution containing a mixture hydrofluoric acid, ethylene glycol phosphoric acid. The morphology crystallinity obtained were investigated means electron microscopy it was found that have constant outer diameter 200 nm internal conical shape where gradually decreases from 120 at wide end 50 narrow end. transmission investigation defined two different phases after annealing amorphous TiO2 air 650 °C 850 °C. Photocatalytic samples been evaluated methylene blue presence dispersed under visible UV irradiation UV/Vis spectroscopy. Anatase phase shows best performance degrading 85 % dye 25 min illumination, while rutile with anatase inclusions decay concentration light illumination.