Characterization and photocatalytic activity of Ti/TinOm •ZrxOy coatings for azo-dye degradation

Abstract

Anodic oxidation of VT1-0 titanium and E-125 zirconium alloy in aqueous electrolyte solutions based on H₂SO₄ and K₄P₂O₇ was used to obtain oxide coatings composed of Zr/ZrO₂, Ti/TiO₂, and mixed oxide systems Ti/TinOm•ZrxOy. It was shown that, depending on the electrolyte pH, the films contain up 0.17 to 2.1 % wt. of zirconium. Catalytic activity of the synthesized coatings in the oxidation reaction of methyl orange azo dye under UV irradiation was established. The process rate constants and synergy factors for the mixed systems were calculated.