The bismuth oxyhalide family: thin film synthesis and periodic properties
Por:
Gómez-Velázquez L.S., Hernández-GordilloCatedrático CONACYT. A., Robinson M.J., Leppert V.J., Rodil S.E., Bizarro M.
Publicada:
21 sep 2018
Categoría:
Inorganic chemistry
Resumen:
Bismuth oxyhalides (BiOX, where X = F, Cl, Br, I) are interesting
materials due to their layered structure, which can be useful for
different applications. In this work, we present the synthesis of the
complete BiOX family in the thin film form. The tetragonal phase Bi2O3
film deposited onto a glass substrate was transformed into BiOF, BiOCl
or BiOBr by a simple immersion at ambient temperature in a halide (X =
F, Cl, Br) containing solution. For these films, a residual phase from
the oxide was present and for BiOF another phase (tentatively identified
as Bi7O5F11) was present too. For the BiOI film synthesis, an iodine and
bismuth containing solution was sprayed onto the glass substrate heated
at 275 degrees C and a pure phase was obtained. Microstructural and
morphological characterization was performed by X-ray diffraction and
scanning electron microscopy, while the chemical environment was studied
by X-ray photoelectron spectroscopy. Optical and photocatalytic
properties were also obtained. The physical and chemical characteristics
of the BiOX films follow a correlation with the atomic radius of the
halogen atom incorporated into the corresponding lattice. All the BiOX
films showed a photocatalytic response for the photodiscoloration of
indigo carmine dye under simulated sunlight irradiation in an alkaline
medium. The photocatalytic reactions occurred via 2 proton-electron
transfer from the oxide or oxyhalide to the adsorbed IC dye, favoring
its reduction to the corresponding leuco IC form.
Filiaciones:
Gómez-Velázquez L.S.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Coyoacán C.P. 04510, Ciudad de México, Mexico
Posgrado en Ciencia e Ingeniería de Materiales, Universidad Nacional Autónoma de México, Mexico
Hernández-GordilloCatedrático CONACYT. A.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Coyoacán C.P. 04510, Ciudad de México, Mexico
Robinson M.J.:
Department of Materials Science and Engineering, University of California, Merced, CA 95343, United States
Leppert V.J.:
Department of Materials Science and Engineering, University of California, Merced, CA 95343, United States
Rodil S.E.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Coyoacán C.P. 04510, Ciudad de México, Mexico
Bizarro M.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Coyoacán C.P. 04510, Ciudad de México, Mexico
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