DEPOSITION OF FIBERS OF DIFFERENT OXIDES ON GLASS SUBSTRATES FOR THE PHOTOCATALYTIC PRODUCTION OF HYDROGEN
Luana Goes Soares
Federal University of Rio Grande do Sul –
Laboratory of Ceramic Materials
Annelise Kopp Alves
Federal
University of Rio Grande do Sul – Laboratory of Ceramic Materials
ABSTRACT
The photocatalytic production of hydrogen has been considered a
promising option to obtain energy in an environmentally sustainable way. Porous
and crystalline semiconductors are often used as photocatalysts in hydrogen
production. In this work, we report the deposition of TiO 2 and TiO 2
fibers containing two different tungsten precursors (H 2 WO 4
or Na 2 WO 4 .2H 2 O), which are heat
treated between 650 ºC and 800 ºC, on glass substrates , which will be used as
photocatalysts in the production of hydrogen when irradiated by ultraviolet
(UV) light. All samples were characterized by: X-ray diffraction (XRD) to
identify the crystalline phases formed, scanning electron microscopy (SEM) for
microstructural analysis of the surface of the films and by colorimetry. The
results showed that all samples were effective in the production of hydrogen,
especially the films containing TiO 2 ∕Na 2 WO 4 .2H
2 O fibers treated at a temperature of 800 ºC. The presence of
tungsten in the fibers favored the formation of hydroxyl radicals (OH) and
adsorption sites on the surface of the samples. This facilitated the transfer
of electrons between the two photocatalysts (TiO 2 and WO 3 ),
contributing to a high rate of photocatalytic hydrogen production.
Keywords: Energy; fibers; Films; Hydrogen.
Reviewed by Current Scientific Journal
on
dezembro 07, 2022
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