Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 278, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2013.12.020
Keywords
Nanotubes TiO2; Ag impregnation; Disinfection; Ag release from Ti/TiO2-Ag; Mycobacterium
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Funding
- FAPESP [2009/09403-5]
- CAPES
- CNPq
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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.
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