The aim of this study was to evaluate the possibility of the metallurgical wastes (slags and fly ash) utilization as a support for photocatalyticaly active composites. Metallurgical slags (MS) represent large volume group of by-products originated during the metallurgical production processes. The fly ash (FA) is the group of the wastes coming from the power plants, which are also part of the big cast iron and steel production plants. Although several applications of MS and FA already exist, non-negligible part is still stored in the landfills and thus the searching for new applications of these wastes is on high demand. Alkali activation of MS and FA represents one of the possibilities of the re-utilization of these wastes, which enables the application of these materials as the inorganic binders in building industry. The combinations of the photocatalysts with cement based materials are intensively studied with the aim of their utilization for the photocatalytic cleaning of the air. In present work, the alkali activated MS was tested as the matrix for the photocatalyticaly active composite kaoline/TiO2 and the alkali activated mixture of MS+FA was evaluated as a support the deposition of TiO2layer. The photodegradation activity of prepared samples against NOx was tested. The results identified the application of TiO2 layer on the surface of alkali activated mixture MS+FA as favourable with respect to NO conversion.Keywords: Slag, alkali activation, TiO2, photocatalysts, photodegradation
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