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Fotoeletrodegradação do corante AO7 utilizando filmes de nanocompósitos de ZnO-TiO2

2012; Brazilian Chemical Society; Volume: 35; Issue: 1 Linguagem: Inglês

10.1590/s0100-40422012000100006

1678-7064

Tânia Frade, A. Gomes, M.I. da Silva Pereira, Ana Lopes, Lurdes Ciríaco,

Pigment Synthesis and Properties

PHOTOELECTRODEGRADATION OF AO7 DYE BY ZnO-TiO 2 NANOCOMPOSITE FILMS.The Zn-TiO 2 nanocomposite films were prepared by electrodeposition, using an acidic zinc sulphate solution with TiO 2 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 .