| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 2.29 MB | Adobe PDF |
Abstract(s)
O presente trabalho tem como objectivo estudar a degradação de matérias orgânicas (e.g.
corante têxtil) sobre substratos têxteis sintéticos, tecido de poliéster, tecido de
poliéster/policloreto de vinilo (PVC) e filmes de PVC. Para o efeito, os substratos têxteis
foram tratados com nanopartículas de dióxido titânio, usando técnicas físicas e químicas.
Assim iniciou-se o estudo da actividade fotocatalítica do dióxido de titânio na presença de
radiação (UV), verificando-se que o corante Astrazon BN sofre uma decomposição efectiva. A
escolha de um corante têxtil como exemplo de uma matéria orgânica prende-se com o facto
de facilmente se poder fazer uma avaliação colorimétrica da sua degradação durante o
trabalho experimental.
Da literatura sabe-se que o dióxido de titânio consegue degradar a generalidade de compostos
orgânicos, podendo inferir-se que este agente seja adequado para enfrentar os poluentes do
mundo exterior que se possam depositar à sua superfície dos objectos, exibindo assim um
comportamento auto-limpante desejado.
Ao longo deste trabalho apresentam-se, discutem-se e comentam-se os resultados da
degradação efectiva ao longo do tempo de um corante de aplicação têxtil. Os resultados
obtidos são bastante promissores, de forma a se pensar que este método é viável em
acabamentos de auto-limpeza de materiais e mesmo no tratamento de efluentes orgânicos.
The present work aims to study the degradation of organic materials (eg textile dye) on synthetic textile substrates, polyester fabric, polyester/polyvinyl chloride (PVC) fabric and PVC films. For this, the textile substrates were treated with nanoparticles of titanium dioxide, using physical and chemical techniques. Thus the study of the photocatalytic activity of titanium dioxide in the presence of UV radiation was done, thus verifying that the Astrazon BN dye undergoes an effective decomposition. The choice of a textile dye as an example of organic matter relates to the fact that one can easily make a colorimetric evaluation of its degradation during the experimental work. From literature it is known that titanium dioxide can degrade the majority of organic compounds, which can be inferred that this agent is adequate to address the pollutants of the outside world that may be placed on the surface of objects, thus exhibiting a required selfcleaning behaviour. Throughout this paper we present, discuss and comment the results of the actual degradation over time of a textile dye. The results are very promising, so we think that this method is feasible in of self-cleaning finishing of materials and even in the treatment of organic wastewater.
The present work aims to study the degradation of organic materials (eg textile dye) on synthetic textile substrates, polyester fabric, polyester/polyvinyl chloride (PVC) fabric and PVC films. For this, the textile substrates were treated with nanoparticles of titanium dioxide, using physical and chemical techniques. Thus the study of the photocatalytic activity of titanium dioxide in the presence of UV radiation was done, thus verifying that the Astrazon BN dye undergoes an effective decomposition. The choice of a textile dye as an example of organic matter relates to the fact that one can easily make a colorimetric evaluation of its degradation during the experimental work. From literature it is known that titanium dioxide can degrade the majority of organic compounds, which can be inferred that this agent is adequate to address the pollutants of the outside world that may be placed on the surface of objects, thus exhibiting a required selfcleaning behaviour. Throughout this paper we present, discuss and comment the results of the actual degradation over time of a textile dye. The results are very promising, so we think that this method is feasible in of self-cleaning finishing of materials and even in the treatment of organic wastewater.
Description
Keywords
Têxteis sintéticos Tecidos de poliester - Auto limpeza Filmes de PVC Tratamentos têxteis - Nanotecnologia Tratamentos têxteis - Dióxido de titânio
Pedagogical Context
Citation
Publisher
Universidade da Beira Interior