Photocatalytic efficient activity of TiO2 films deposited on ceramic tiles

Reference Presenter Authors
(Institution)
Abstract
06-085 Jessica da Rocha Silva Silva, J.d.(UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL); BERGMANN, C.P.(UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL); Alves, A.K.(Universidade Federal do Rio Grande do Sul); Rodrigues, D.d.(UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL); Titanium dioxide in its anatase crystallographic phase is one of the most studied photocatalysts. The possibility of being applied together with ceramic materials for both external and internal use, as in tiles and coatings, makes its application quite interesting. In this context, this work relates the deposition of films obtained from a solution of TiO2 in coating ceramic pieces (traditional ceramics) through the spray method with an airbrush. The substrates were characterized by apparent porosity and water absorption. The photocatalytic effect of the obtained films was evaluated by monitoring the degradation of a 1 ppm solution of the methyl orange dye when irradiated by UVA light. An absorbance test of this dye solution was also performed. Different combinations of deposition parameters were tested: solution flow rate and deposition time. The film obtained using the most promising condition showed a significant discoloration of the dye, with a degradation of more than 80% when irradiated by UV light. Thus, this technique can be used as an alternative in the manufacture of ceramic parts with photocatalytic properties through immobilized photocatalysts for self-cleaning applications.
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