Full scale demonstration of air-purifying pavement

Design and performance evaluation of the functional coating for air purification under indoor conditions

“…The KC7000 is a C-TiO 2 powder with an anatase TiO 2 content of >87.5%, density ( ) of 3.9 g/cm 3 , crystallite size approximately 15 nm, with an internal specific surface area A > 225 m 2 /g, responsive to visible light up to nearly 550 nm [25] and application range of 4-9 pH (these information were acquired from data sheet of the provider). The SC40 is a water-based suspension containing around 40% of C-TiO 2 by mass , has a pH of 7-8 (at 20 • C), flash point >90 • C, a density ( ) of 1.35-1.55 g/cm 3 (at 20 • C) and a dynamic viscosity <800 mPa s. A commercially used protective water-based acrylic top coating (TC54, designated TC) was used as the base material (provided by Polytex). Wallpaper carrier (provided by BN International) consisted of a paper substrate coated with a layer of polyvinyl chloride (PVC).…”

“…Photocatalytic oxidation (PCO) technology is considered as one of the potentially very efficient advanced oxidation processes for the improvement of the air quality by degrading inorganic and organic air pollutants [3][4][5][6]. The most used photocatalyst -titanium dioxide (TiO 2 ) (pure or modified) -has received considerable attention in the past decade due to its high PCO activity, high chemical stability, low toxicity and low cost [7,8].…”

“…The practical use of photocatalysis seems to be far less developed than the scientific interest, as reflected by the large number of scientific publications in comparison with the limited number of products that appear in the market [7]. Several building materials have been used as carriers for the application of photocatalytic materials, for example concrete [3,10], mortar [4,11], clays [12], polymers [9,13,14], etc. It can be concluded that the application of photocatalytic materials is more beneficial while applied as a top layer rather than in the whole volume of the product, where most of the photocatalytic materials are hindered, not exposed to the environment and thus, not effective.…”

Photocatalytic self-cleaning coatings for building facade maintenance. Performance analysis through a case-study application

“…This can be particularly relevant for certain outdoor applications, when this behaviour could be more suitable to maintain facade surfaces in a clean condition according to specific operating environments. In fact, soiling deposits are very unlikely to stick onto the surface of hydrophobic (Ballari & Brouwers, 2013). Conversely, in the former case the coated area could remain clean for longer periods without any need for rain.…”

“…dominant wind direction, relative humidity values and the presence of direct solar irradiation) (Ballari & Brouwers, 2013;Moussiopoulos et al, 2008;Maggos et al, 2007). Further analysis on prevalent wind direction during rain events could be performed in the future to determine the influence of wind driven rain on a specific elevation on the global self-cleaning performance.…”