Pontos quânticos de TiO2: um inovativo nanomaterial para funcionalização de materiais têxteis
The UN 2030 agenda aims to achieve sustainability through 17 objectives, including: industry, innovation and infrastructure; clean water and sanitation. In this sense, it is necessary to search for sustainable materials, especially to treat water in the textile industry, which generates a high lo...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/57286 |
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| Resumo: | The UN 2030 agenda aims to achieve sustainability through 17 objectives,
including: industry, innovation and infrastructure; clean water and sanitation. In this
sense, it is necessary to search for sustainable materials, especially to treat water
in the textile industry, which generates a high load of polluting effluents. As a result,
nanomaterials are studied and used for applications that minimize this problem.
One of the applications is for photocatalysis processes, due to the high efficiency
of these nanostructures due to their surface area, such as: TiO2, ZnO and other
semiconductors. Other emerging nanomaterials are nanoparticles with reduced
size (1-10 nanometers), which, due to their size, undergo quantum confinement and
are therefore called quantum dots. The main problem involving TiO2 quantum dots
is the agglomeration of particles in the medium, which makes their use in
photocatalysis complex. In this study, the objective was to evaluate the applicability
of TiO2 quantum dots (PQs TiO2) immobilized on textile fibers for potential
application in photocatalysis. The synthesis of PQs TiO2 was carried out via sol gel
and immobilized on regenerated soy fibers using the layer-by-layer method. The
photocatalytic evaluation was carried out using a variation of rhodamine B
concentration. In the second study, a Box-Behken type factorial design was used
where the variables: TiO2/Au ratio (%), temperature, time and pH of the solution
immobilization, with the photodegradation of the reactive dye black 5 as the
response variable. The soybean and polyamide fabric samples were characterized
by XRD, XPS, HRTEM-SAED, SEM-FEG as well as colorimetric analyses. The
results prove that the quantum dots obtained have a tetragonal crystalline structure,
corresponding to the anatase phase, with a size of approximately 6 nm. The results
of photocatalysis of functionalized soy fiber showed excellent photocatalytic
efficiency, degrading 2 ppm of rhodamine B in 120 minutes, with durability of up to
5 reuse cycles. The polyamide fabric nanocoated with PQs TiO2/Au showed an
efficiency of approximately 100% photodegradation of 20 ppm of the RB5 dye, in
240 minutes and with reuse stability in 5 consecutive cycles. Therefore, the application of quantum dots to textile fibers as functionalization agents is a promising way to obtain flexible surfaces with excellent photocatalytic properties. |
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