Título: | LOW-TEMPERATURE SINTERING OF TITANIA USED IN PHOTOCATALYTIC REACTIONS | ||||||||||||
Autor: |
ANNA LUISA WERNECK RUOTOLO MIGUEL |
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Colaborador(es): |
ROBERTO RIBEIRO DE AVILLEZ - Orientador SONIA LETICHEVSKY - Coorientador |
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Catalogação: | 16/NOV/2021 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=55896&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=55896&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.55896 | ||||||||||||
Resumo: | |||||||||||||
The quest to reduce dependence on fossil fuels makes science advance,
daily, in the use of ecological fuels, such as H2. One of the ways to obtain it is
through photocatalysis. This process consists on a catalytic reaction using energy,
in the form of light. Water photolysis is widely used, mainly with sunlight as a light
source, which is abundant and reduces production costs. The performance of this
reaction depends on the position of the conduction (CB) and valence (VB) bands
of the photocatalyst. TiO2 is used as a photocatalyst in several reactions, including
the production of H2. Photocatalysts used in the form of nanometric powders have
difficulty in separating after the reaction. The transformation of the powder into a
compact material is an alternative to remove it from the reaction medium, avoiding
losses and costs with separation. Thus, the compaction of the powder is an
alternative to facilitate its recycling. The main method of its production is through
the sintering process, which involves high temperatures (generally 75 percent of the
material s melting point) and a long time, which can last up to days. To reduce
energy costs, the cold sintering process is an option, which consists of densifying
the material using pressure and a solvent (aqueous or not) and sintering
temperatures of up to 500 C degrees. The aim of the study was the production of
commercial TiO2 and P25 pellets, through a variant of the cold sintering method,
where pressure was applied to the powder, with the proper solvent, before the heat
treatment. The pellets produced were characterized by the techniques of
TGA/DSC, XRD, SEM, CV, and DRS.
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