Highly ordered TiO2 nanotube arrays and photoelectrocatalytic oxidation of aromatic amine

Autor(es)

Cardoso, Juliano Carvalho ^[1] ; Lizier, Thiago Mescoloto ^[1] ; Boldrin Zanoni, Maria Valnice ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Quim, Dept Quim Analit, BR-14801970 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 99, n. 1-2, p. 96-102, AUG 31 2010.
• Citações Web of Science: 58

Resumo

Self-organized Ti/TiO(2) nanotubular array electrodes may be achieved by simple electrochemical anodization of Ti foil in NH(4)F/glycerol water solution. The photocurrent on nanotubular layers is remarkably improved in relation to that obtained on comparable nanoporous TiO(2) films created by a sol gel process. The anatase form is priori in the highly ordered TiO(2) annealed at 450 degrees C which improves its photoactivity. Both electrodes promote complete degradation of the investigated aromatic amine ODAN (4,4'-oxydianiline) after 120 min of photoeletrocatalytic oxidation with potential of 1.5V and UV irradiation. But, the ODAN mineralization is about 50% more efficient on nanotubular electrodes. The best experimental conditions were found to be pH 2.0 and 0.1 mol L(-1) Na(2)SO(4) when the photoelectrode was biased at +1.5 V (vs. SCE). Complete mineralization of the aromatic amine content (100% TOC reduction) was achieved after 2 h. Effects of other electrolytes, pH, amine concentration and applied potentials also have been investigated and are discussed. (C) 2010 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/07313-3 - PREPARAÇÃO, CARACTERIZAÇÃO E APLICAÇÃO DE ELETRODOS DE NANOTUBOS DE TiO2 NA DEGRADAÇÃO FOTOELETROCATALÍTICA DE AMINAS AROMÁTICAS.
• Beneficiário: Juliano Carvalho Cardoso
• Modalidade de apoio: Bolsas no Brasil - Doutorado