Adsorption and Photocatalytic Degradation of Methylene Blue on TiO2 Thin Films Impregnated with Anderson-Evans Al-Polyoxometalates: Experimental and DFT Study
Autor
Duran, Freider
Diaz-Uribe, Carlos
Vallejo, William
Muñoz-Acevedo, Amner
Schott, Eduardo
Zarate, Ximena
Resumen
In this work, we fabricated a TiO2 thin film, and the same film was modified with an Anderson aluminum polyoxometalate (TiO2-AlPOM). Physical-chemical characterization of the catalysts showed a significant change in morphological and optical properties of the TiO2 thin films after surface modification. We applied the kinetic and isothermal models to the methylene blue (MB) adsorption process on both catalysts. The pseudo-second order model was the best fitting model for the kinetic results; qe (mg/g) was 11.9 for TiO2 thin films and 14.6 for TiO2-AlPOM thin films, and k2 (g mg-1 min-1) was 16.3 × 10-2 for TiO2 thin films and 28.2 × 10-2 for TiO2-AlPOM thin films. Furthermore, the Freundlich model was suitable to describe the isothermal behavior of TiO2, KF (5.42 mg/g), and 1/n (0.312). The kinetics of photocatalytic degradation was fitted using the Langmuir-Hinshelwood model; kap was 7 × 10-4 min-1 for TiO2 and 13 × 10-4 min-1 for TiO2-AlPOM. The comparative study showed that TiO2 thin films reach a 19.6% MB degradation under UV irradiation and 9.1% MB adsorption, while the TiO2-AlPOM thin films reach a 32.6% MB degradation and 12.2% MB adsorption on their surface. The surface modification improves the morphological, optical, and photocatalytic properties of the thin films. Finally, the DFT study supports all the previously shown results. © 2023 The Authors. Published by American Chemical Society
Colecciones
Ítems relacionados
Mostrando ítems relacionados por Título, autor o materia.
-
Article
Photocatalytic Degradation of Methylene Blue under Visible Light Using TiO2 Thin Films Impregnated with Porphyrin and Anderson-Type Polyoxometalates (Cu and Zn) (2024)
Sanguino, Alexander; Diaz-Uribe, Carlos; Duran, Freider; Vallejo, William; Guzman, Leidy; Ruiz, Daniela; Puello, Esneyder; Quiñones, Cesar; Schott, Eduardo; Zarate, Ximena (MDPI, 2022)In this work, tetra(4-carboxyphenyl)porphyrin (TCPP) and two Anderson-type polyoxomolybdates (containing Cu and Zn, respectively; CuPOM, ZnPOM) were synthesized and deposited on TiO2 thin films. The properties of the ... -
Article
Theoretical and kinetic study of the singlet oxygen quenching reaction by hesperidin isolated from mandarin (Citrus reticulata) fruit peels (2021)
Díaz-Uribe, Carlos Enrique; Vallejo-Lozada, William Andrés; de la Hoz, Teylis; Flórez, Jiress; Muñoz-Acevedo, Amner; Zárate, Ximena P.; Schott V., Eduardo (Springer Science and Business Media Deutschland GmbH, 2021)Antioxidants act as quenchers or scavengers of oxidative free radicals and singlet oxygen (1O2); these compounds are effective in the treatment of diseases associated with oxidative stress and food preservation. We studied ... -
Article
TiO2 thin films sensitization with natural dyes extracted from Bactris guineensis for photocatalytic applications: Experimental and DFT study (2020)
Diaz-Uribe C.; Vallejo W.; Romero E.; Villareal M.; Padilla M.; Hazbun N.; Muñoz-Acevedo A.; Schott E.; Zarate X. (Elsevier B.V., 2020)