NO <inf>x</inf> removal of mortar mixed with titania produced from Ti-salt flocculated sludge
- Publication Type:
- Journal Article
- Journal of Industrial and Engineering Chemistry, 2014, 20 (5), pp. 3851 - 3856
- Issue Date:
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Norms for the emissions of NO x are becoming stricter and stricter, leading to an increase in the research interest for the development of novel gas cleaning technologies. In this study, the use of titania (TiO 2 ) produced from Ti-salt flocculated sludge, mixed with mortar, has been investigated as a cost-effective novel solution for the removal of these pollutant gases. This work not only presents an advanced solution for sludge reduction but also proposes a novel production method of TiO 2 powders from waste water and investigates the potential use of this material blinded with mortar for a novel application which is air purification. Detailed characterization of the produced TiO 2 powders was performed and results showed that the primary particles present a uniform size and spherical shape with a diameter of less than 50nm. The main constitutive elements were Ti, O, C and P, where the Ti content was found to increase slightly with increasing temperature. The anatase phase was observed at 600°C and 800°C and converted to rutile structure at 1000°C. Two contents (i.e. 3.0 and 5.0wt%) of TiO 2 were tested for mixing with mortar and photocatalytic properties of the mortar containing TiO 2 were evaluated for the removal of NO x and were found to be similar to commercial TiO 2 (P-25) in terms of photocatalytic activity. Further investigations under direct sunlight were conducted after 28 days of water curing to evaluate the removal of NO x . The NO rejection was about 50% after 5h. © 2014 The Korean Society of Industrial and Engineering Chemistry.
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