Resumo

FRADE, Tânia et al. Photoelectrodegradation of AO7 dye by ZnO-TiO₂ nanocomposite films. Quím. Nova [online]. 2012, vol.35, n.1, pp. 30-34. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422012000100006.

The Zn-TiO₂nanocomposite films were prepared by electrodeposition, using an acidic zinc sulphate solution with TiO₂ nanoparticles in suspension. The as-deposited samples have been heated in air at 450 ºC for 6 h. The XRD and SEM analyses pointed out to the metal matrix conversion from Zn to ZnO and a rich morphology of needles-shaped grains. These materials were used on the photoelectrochemical degradation of AO7, which was efficiently degraded, with 40% of color removal, after 2 h period at 1.0 V, under white light irradiation. The apparent first order rate constant of the photoelectrodegradation reaction was 4.12 x 10^-3 min^-1.

Palavras-chave : ZnO-TiO₂ nanocomposite films; AO7 dye; photoelectrodegradation.