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Title
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Photocatalytic activity of titanium dioxide nanoparticle coatings applied on autoclaved aerated concrete: Effect of weathering on coating physical characteristics and gaseous toluene removal
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Author
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Abstract
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| Autoclaved aerated concrete has been coated by TiO2 nanoparticles through a dip-coating (DC) and a novel vacuum saturation (VS) method to investigate the weathering resistance and gaseous toluene removal potential of both coating types. The effect of intensive weathering – corresponding to a period of about 25 years – on the coating characteristics was studied in terms of TiO2 content, coating thickness and color changes. Toluene removal was investigated in a lab-scale flow-through photoreactor at 24 °C and 52% relative humidity, and results obtained immediately after application of the coatings and after two weathering stages were compared. Weathering of the DC and VS coated samples resulted into a decrease of the coating layer thickness of more than 98%, confirmed by a decline in TiO2 content by more than 99% and 93%, respectively. Surprisingly, toluene removal efficiencies before and after weathering kept constant at about 95% for both coating types, corresponding to an elimination rate of 60–70 mg/(m2 h) at an initial toluene concentration of 15 ppmv and a gas residence time of 3 min. Increasing the toluene load by applying higher toluene inlet concentrations (up to 35 ppmv) and lower gas residence times (1 min) did decrease the toluene removal efficiency to 32–41%, but elimination rates increased up to 214 mg/(m2 h), being a factor of 1.6–4.5 times higher than reported in recent work. |
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Language
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English
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Source (journal)
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Journal of hazardous materials. - Amsterdam
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Publication
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Amsterdam
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2012
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ISSN
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0304-3894
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DOI
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10.1016/J.JHAZMAT.2011.12.037
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Volume/pages
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211-212
(2012)
, p. 218-225
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ISI
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000302756100026
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Full text (Publisher's DOI)
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