Deposición electroforética de TiO2 sobre acero inoxidable 316 y su evaluación como fotoánodo para la decoloración fotoelectrocatalítica del colorante azoico RR239 bajo luz UV
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Date
Subject
Titanium dioxide (TiO2)
Electrophoretic Deposition (EPD)
Photoelectrocatalysis (PEC)
Dye RR239
Photocatalyst
dióxido de titanio (TiO2)
Deposición Electroforética (EPD)
Fotoelectrocatálisis (FEC)
colorante RR239
fotocatalizador
Electrophoretic Deposition (EPD)
Photoelectrocatalysis (PEC)
Dye RR239
Photocatalyst
dióxido de titanio (TiO2)
Deposición Electroforética (EPD)
Fotoelectrocatálisis (FEC)
colorante RR239
fotocatalizador
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Journal Title
Journal ISSN
Volume Title
Publisher
Instituto Tecnológico de Santo Domingo (INTEC)
Se realizó la deposición electroforética (EPD) de los semiconductores TiO2_Aeroxide®P25 y TiO2_Comercial sobre acero inoxidable para la fabricación de fotoánodos con potencial uso en la decoloración fotoelectrocatalítica del colorante azoico Rojo_Reactivo_239 (RR239). Se estudió la influencia de los parámetros de la EPD sobre la homogeneidad e integridad de los depósitos. Asimismo, se analizó el efecto de la composición de las fases fotocatalíticas y el ancho de la banda prohibida óptica de los semiconductores en el rendimiento de la decoloración. Las condiciones de fabricación de los electrodos se establecieron en una primera etapa experimental variando el modo de aplicación del voltaje (pulsado y no pulsado) a 10 V y un tiempo de deposición de 30 s. Posteriormente, se varió la temperatura del tratamiento térmico (250 y 350 °C) necesario para la estabilización del depósito. Definido el modo de aplicación del voltaje y la temperatura del tratamiento térmico, se realizó una segunda etapa para establecer el tiempo de la EPD en un rango entre 10 y 60 s. Cuando el voltaje se aplicó por pulsos, los depósitos resultaron más uniformes y homogéneos. El uso de TiO2_Aeroxide®P25 y TiO2_Comercial permitió alcanzar porcentajes de decoloración superiores al 80 % cuando la EPD se ejecutó a 1,1 V durante 1 h irradiando el ánodo con luz UV (λ.= 365 nm). Las condiciones de la EPD y la temperatura del tratamiento térmico mostraron un efecto apreciable sobre las características físicas de los depósitos y su eficacia como fotoánodos para la decoloración de RR239. Se lograron las condiciones adecuadas para la fabricación de los fotoánodos, siendo el TiO2_Comercial una alternativa de reemplazo del TiO2_Aeroxide®P25 en aplicaciones fotoelectrocatalíticas para la decoloración de RR239 bajo las condiciones evaluadas debido a su rendimiento comparable y bajo costo.
Electrophoretic deposition (EPD) of semiconducting TiO2_Aeroxide®P25 and TiO2_Commercial on stainless steel was performed for the fabrication of photoanodes with potential use in the photoelectrocatalytic decolorization of the azo dye Red_Reactive_239 (RR239). The influence of the EPD parameters on the homogeneity and mechanical stability of the deposits was studied. In addition, the effect of the composition of the photocatalytic phases and the optical bandgap of the semiconductors on the decolorization performance was analyzed. The fabrication conditions of the electrodes were established, in a first experimental stage, by varying the voltage application mode (pulsed and non-pulsed) at 10 V and a deposition time of 30 s. Subsequently, a variation of the heat treatment temperature (250 and 350 °C) necessary for the stabilization of the deposit was carried out. Once the voltage application mode and the heat treatment temperature were defined, a second step was performed to establish the EPD time in a range between 10 and 60 s. When the voltage was applied pulsed, the deposits were uniform and homogeneous. The use of TiO2_Aeroxide®P25 and TiO2_Commercial allowed to reach decolorization percentages higher than 80 % when the EPD was performed at 1.1 V for 1 h irradiating the anode with UV light (λ = 365 nm). EPD conditions and the temperature of the thermal treatment showed an appreciable effect on the physical characteristics of the deposits and their effectiveness as photoanodes for RR239 decolorization. Suitable conditions for the fabrication of the photoanodes were achieved, being TiO2_Commercial an alternative replacement for TiO2_Aeroxide®P25 in photoelectrocatalytic applications for RR239 decolorization under the evaluated conditions due to its comparable performance and low cost.
Electrophoretic deposition (EPD) of semiconducting TiO2_Aeroxide®P25 and TiO2_Commercial on stainless steel was performed for the fabrication of photoanodes with potential use in the photoelectrocatalytic decolorization of the azo dye Red_Reactive_239 (RR239). The influence of the EPD parameters on the homogeneity and mechanical stability of the deposits was studied. In addition, the effect of the composition of the photocatalytic phases and the optical bandgap of the semiconductors on the decolorization performance was analyzed. The fabrication conditions of the electrodes were established, in a first experimental stage, by varying the voltage application mode (pulsed and non-pulsed) at 10 V and a deposition time of 30 s. Subsequently, a variation of the heat treatment temperature (250 and 350 °C) necessary for the stabilization of the deposit was carried out. Once the voltage application mode and the heat treatment temperature were defined, a second step was performed to establish the EPD time in a range between 10 and 60 s. When the voltage was applied pulsed, the deposits were uniform and homogeneous. The use of TiO2_Aeroxide®P25 and TiO2_Commercial allowed to reach decolorization percentages higher than 80 % when the EPD was performed at 1.1 V for 1 h irradiating the anode with UV light (λ = 365 nm). EPD conditions and the temperature of the thermal treatment showed an appreciable effect on the physical characteristics of the deposits and their effectiveness as photoanodes for RR239 decolorization. Suitable conditions for the fabrication of the photoanodes were achieved, being TiO2_Commercial an alternative replacement for TiO2_Aeroxide®P25 in photoelectrocatalytic applications for RR239 decolorization under the evaluated conditions due to its comparable performance and low cost.
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info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Art.
info:eu-repo/semantics/publishedVersion
Art.
Source
Science, Engineering and Applications; Vol. 5 No. 2 (2022): Science, Engineering and Applications; 39-62
Ciencia, Ingenierías y Aplicaciones; Vol. 5 Núm. 2 (2022): Ciencia, Ingenierías y Aplicaciones; 39-62
2636-2171
2636-218X
10.22206/cyap.2022.v5i2
Ciencia, Ingenierías y Aplicaciones; Vol. 5 Núm. 2 (2022): Ciencia, Ingenierías y Aplicaciones; 39-62
2636-2171
2636-218X
10.22206/cyap.2022.v5i2