ESTUDO DA DEGRADAÇÃO DE BENZENO EM AR CONFINADO POR TiO2 PRESENTE EM REVESTIMENTO CERÂMICO COMERCIAL E ASSISTIDA POR RADIAÇÃO ULTRAVIOLETA

• Ano de defesa: 2017
• Autor(a) principal: Crepaldi, Ricardo
• Orientador(a): Chaves, Márcia Rodrigues de Morais
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Sagrado Coração
• Programa de Pós-Graduação: Ciência e Tecnologia Ambiental
• Departamento: Ciências da Saúde e Biológicas
• País: Brasil
• Palavras-chave em Português: Compostos Orgânicos Voláteis; Dióxido de Titânio; Revestimento Cerâmico; Qualidade do Ar Interior.; Controle de Poluição Atmosférica
• Palavras-chave em Inglês: Volatile Organic Compounds; Titanium Dioxide; Ceramic Tile; Indoor Air Quality; Air Pollution Control
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA
• Link de acesso: https://tede2.unisagrado.edu.br:8443/handle/tede/489

The Volatile Organic Compounds (VOC) are substances that have the potential adverse human health, constituting a class of air pollutants. Among the possible methods for the treatment of environments with a high concentration of VOC is the photocatalytic degradation on the TiO2 surfaces. The use of ceramic coatings containing active surface of TiO2 was originally proposed due to self-cleaning function, required in exterior areas. Associated with this characteristic, the NOx photocatalytic conversion to nitrate and accordingly, nitric acid, has been reported. There are only few researches on VOC degradation capacity for these ceramic especially when considering the use in indoor environments of buildings. In this context, this project proposes the study of photocatalytic degradation capacity of benzene (VOC) present in confined air, laboratory’s scale, by commercial ceramic containing TiO2 in surface. The hypothesis considered in this study is that commercial ceramics coatings can be used in indoor environmental in buildings, in order to degrade VOC, reducing atmospheric pollution and thus improving the quality of life of people undergoing such environments. This study was conducted in an adapted chamber to receive the ceramic plate and UV light radiation as well as a source of VOC. The volatilized benzene came into contact with the ceramic plate under UV light radiation 365 nm and UV 254 nm. Samples of the internal atmosphere of the chamber, obtained by adsorption time intervals polydimethylsiloxane fiber was collected (HS-SPME). The degradation of benzene was followed by gas chromatography analysis with mass spectrometry (GC-MS). The results showed the non-reduction of the benzene concentration in the atmosphere by a function of energy of light radiation of UV light 365 nm or UV light 254 nm. The physic-chemical characterization determined a very small amount of TiO2 on the surface of commercial ceramic plate, which has been suggested as the cause for not detectable catalytic action of benzene degradation.