STUDY OF THE PHOTOCATALITIC EFFECTS OF THE TiO2 FILM APPLIED IN CERAMICS TILES

Reference Presenter Authors
(Institution)
Abstract
06-197 Morgana Nuernberg Sartor Sartor, M.N.(Faculdade Satc); Vieira, G.M.(Faculdade Satc); Melo, A.R.(Faculdade Satc); Acordi, J.(Universidade Federal de Santa Catarina); Milak, G.B.(Universidade do Extremo Sul Catarinense); Mattos, A.(Faculdade SATC); Marques, C.R.(Faculdade SATC); Ribeiro, J.S.(Universidade do Extremo Sul Catarinense); In the ceramic and construction industries, there is a special interest for the bactericidal effect of titanium dioxide (TiO2), for the control of biological contamination, in microbiologically sensitive environments. TiO2 is one of the most effective photocatalysts for the oxidation, at room temperature, of many hazardous organic products and also as a attractive compound for conversion of solar energy. The objective of this study was to evaluate the efficiency of the photocatalytic effects of TiO2, applied in ceramic tiles by means of two methods: spray and screen printing. After applying the film, to the ceramic substrate, these were heat treated for TiO2 immobilization and activated by ultraviolet radiation emitted by sunlight. The efficacy of the application method was assessed by qualitative analysis (visual analysis) and quantitative (methylene blue dye degradation). These applications were made with a screen printing paste containing a mixture of titanium dioxide and water-soluble organic carrier, doped with zinc oxide. Results of the qualitative analysis showed a significant difference in the ease of dye run off on the surfaces of the TiO2 specimens. In the samples without the fime, the dye remained on the surface throughout the experiment without degradation. The results for the quantitative analysis showed that the application forms (spray and screen printing) didn´t significantly change the amount of degraded material, resulting in a decreased by up to 20% in efficiency, when compared to the standard sample. To assure the quality of the tiles, ceramic tests were done, such as cracking and chemical attack resistance. In the cracking tests, ceramic tiles with TiO2 film were resistant to five cycles at a pressure of 5 atm at 100 ° C, without crack failure. Satisfactory results were also obtained in chemical resistance, where both materials resisted all exposed reagents following NBR 13818.
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