Improvement of the photocatalytic activity after reusing one-dimensional dark-ZnO films
Por:
Bizarro M., Ballesteros-Balbuena M., Castrejón-Sánchez V.H., Hernández-Gordillo A., Camacho-López M.
Publicada:
1 ene 2025
Resumen:
One-dimensional ZnO nanostructures with intrinsic defects were obtained by thermal oxidation of commercial zinc foils. Zn foils were oxidized using a tube furnace at 420 °C for 20, 30 and 44 h in air atmosphere to analyze the impact of the oxidation time in the surface morphology and photocatalytic response. The as-grown ZnO samples had a dark aspect and were characterized by Scanning Electron Microscopy, Raman Spectroscopy, X-Ray Diffraction, UV–Vis Diffuse Reflectance Spectroscopy and Photoluminescence. These samples were evaluated in photocatalytic experiments using a 10 mg/L aqueous solution of indigo carmine dye under solar simulated irradiation. The photocatalytic dye removal increased after each reuse. Physical changes were observed, such as the “dark” aspect of the surface that appeared whiter after each cycle. The characterization of the samples was performed after 5 photocatalytic cycles to confirm the evolution of the as-grown materials. The repeated photocatalytic process of the films in contact with the aquaeous solution and under irradiation contributed to a better oxidation of the zinc foils, as the presence of the metallic zinc peak in XRD disappeared. PL measurements revealed a diminution of the band-to-band transition respect to the visible band emission after the cycles, indicating a drastic change in the recombination process. The synthesis of ZnO using commercial zinc foils is a simple, reproducible and scalable option to produce materials with excellent and long-lasting photocatalytic activity. © 2024 The Authors
Filiaciones:
Bizarro M.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Coyoacán, Mexico City, CP 04510, Mexico
Ballesteros-Balbuena M.:
Estancias Posdoctorales por México CONACyT- Facultad de Química, Universidad Autónoma Del Estado de México, Campus Rosedal, Km 14.5 Carretera Toluca-Atlacomulco, Toluca, 50295, Mexico
Laboratorio de Investigación y Desarrollo de Materiales Avanzados, Facultad de Química, Universidad Autónoma Del Estado de México, Campus Rosedal, Km 14.5 Carretera Toluca-Atlacomulco, Toluca, 50295, Mexico
Castrejón-Sánchez V.H.:
Tecnológico de Estudios Superiores de Jocotitlán, Ingeniería en Materiales, Atlacomulco Km 44.8, Ejido de San Juan y San Agustín, Jocotitlán, C.P. 50700, Mexico
Hernández-Gordillo A.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Coyoacán, Mexico City, CP 04510, Mexico
Camacho-López M.:
Laboratorio de Investigación y Desarrollo de Materiales Avanzados, Facultad de Química, Universidad Autónoma Del Estado de México, Campus Rosedal, Km 14.5 Carretera Toluca-Atlacomulco, Toluca, 50295, Mexico
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