N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions
AUTOR(ES)
Castellanos-Leal, Edgar Leonardo, Acevedo-Peña, Próspero, Güiza-Argüello, Viviana Raquel, Córdoba-Tuta, Elcy María
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
23/02/2017
RESUMO
N-F codoped TiO2 films were immobilized on stainless steel sheets through a combined approach involving a dip-coating technique and a hydrothermal treatment, followed by calcination at 400°C in the presence of air. Photocatalyst characterization was conducted using XRD, Raman and UV-VIS spectroscopy as well as SEM. The films were tested in a three-electrode cell for the photoelectrocatalytic degradation of CN-containing compounds. The results showed that the increase in the degradation rate of CN-containing compounds is both influenced by a synergistic effect of the doping agents and strongly dependent on the concentration of CN-containing compounds in the solution. Nitrogen contributed to the enhanced photoactivity under visible light due to the generation of localized states within the band gap of TiO2, whereas the presence of fluoride improved the superficial properties of the film, which resulted in higher amounts of CN-containing compounds that were degraded by direct charge transfer through the photogenerated holes.
Documentos Relacionados
- TiO2 thin Films for Biofouling Applications
- Photo-assisted electrochemical copper removal from cyanide solutions using porous TiO2 thin film photo-anodes
- Synthesis and characterization of nanostructured TiO2 and TiO2/W thin films deposited by co-sputtering
- Sol-Gel TiO2 thin films sensitized with the mulberry pigment cyanidin
- Deposition of TiO2 Film on Duplex Stainless Steel Substrate Using the Cathodic Cage Plasma Technique