Due to the increase in harmful emission gases in the World’s inner cities, it is apparent that there is a need to remove pollutants, such as nitrogen oxides, NOx, and sulphur dioxide, SO2, from the atmosphere. Not only do these gases pose a threat to health, they are also causing degradation to many inner city buildings (Allen et al., 2000). Despite attempts to lower these emissions from cars, it appears that a way of removing such pollutants once in the atmosphere needs to be sought. Inorganic photocatalysts, such as titanium dioxide, have been exploited for the past 10 years. It has shown to be a relatively cheap and effective way of removing organic poison compounds and pollutant gases from both air and aqueous environments.
Paving Out Pollution
Inorganic photocatalysts, such as titanium dioxide, have been exploited for the past 10 years. It has shown to be a relatively cheap and effective way of removing organic poison compounds and pollutant gases from both air and aqueous environments.
For the past 10 years, LumActiv® has been successfully integrated by cement, concrete manufacturers in the production. The application has also been introduced through application service provider in the retrofit post application environment. These photocatalyst ecological bricks constitutes a promising technique to reduce a number of air contaminants especially at sites with a high level of pollution: highly trafficked canyon streets, road tunnels, the urban environment, etc. Ideally, the photocatalyst, titanium dioxide, is introduced in the top layer of the concrete pavement for best results. In addition, the combination of TiO2 with cement-based products offers some synergistic advantages, as the reaction products can be adsorbed at the surface and subsequently be washed away by rain.
Air pollution in the city caused by industrial smog, emission of the vehicles have raised many concerns. However many cities in Japan are now using our photocatalyst coating on the pedestrian pavement for purifying the city air. Just 25m2 (270ft2) of our photocatalyst coating is equivalent to the air purifying power of one poplar tree. The oxidizing power of LumActiv® means that when pollutants such as smog, car exhaust come in contact with the surface, the photocatalyst titanium dioxide coating decomposes them and convert it into harmless byproducts. ( Test method for air purification performance of photocatalytic materials—JIS R1701-1 Corresponding ISO 22197-1 )