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

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...

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Published inQuímica Nova Vol. 35; no. 1; pp. 30 - 34
Main Authors Frade, Tânia, Gomes, Anabela, Pereira, Maria Isabel da Silva, Lopes, Ana, Ciríaco, Lurdes
Format Journal Article
LanguageEnglish
Published Sociedade Brasileira de Química 2012
Subjects
AO7 dye
photoelectrodegradation
ZnO-TiO2 nanocomposite films
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Summary: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.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40422012000100006