Silver ion release from electrodes of nanotubes of TiO2 impregnated with Ag nanoparticles applied in photoelectrocatalytic disinfection

Autor(es)

Brugnera, Michelle Fernanda ^[1] ; Miyata, Marcelo ^[2] ; Fujimura Leite, Clarice Queico ^[2] ; Boldrin Zanoni, Maria Valnice ^[1]

Afiliação do(s) autor(es)

^[1] UNESP, Dept Analyt Chem, Inst Chem Araraquara, BR-14800900 Araraquara, SP - Brazil

^[2] UNESP, Dept Biol Sci, Fac Pharmaceut Sci Araraquara, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 278, p. 1-8, MAR 15 2014.
• Citações Web of Science: 18

Resumo

Self-organized TiO2 nanotubes arrays electrodes were impregnated with 0-16% of Ag nanoparticles (Ti/TiO2-Ag) using different procedures. The electrodes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and photocurrent vs potential curves. The best results were obtained by electrode prepared by photochemical reduction, after immersion in a solution AgNO3 0.05 M (pH 8). The monitoring of Ag+ lixiviation by anodic stripping voltammetry at glassy carbon electrode indicated that a maximum of 2.5 x 10(-6) M is released in the first 40 min of treatment, but it is neglected when used subsequently. Moreover, the antimicrobial behavior of electrodes Ti/TiO2-Ag applied in photoelectrocatalysis presented 100% disinfection in 3 min by using UV irradiation and 99.6% in 30 min with visible irradiation. In addition, the analysis of silver in solution along the reaction shows a negligible lixiviation and a high stability of the surface silver deposits. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/09403-5 - Métodos eletroanalíticos e cromatográficos aplicados na análise de micobactérias e desinfecção fotoeletrocatalítica de micobactérias e candidas utilizando eletrodos de nanotubos de Ti/TiO2 e Ti/TiO2-Ag
• Beneficiário: Michelle Fernanda Brugnera
• Modalidade de apoio: Bolsas no Brasil - Doutorado