21-10-2014, 09:48 AM
Abstracts: Air pollution is a major problem in most large cities all over the world. Reducing the amountof pollutants is one approach to reduce exposure due to local emissions. Heterogeneous photo catalysis is a rapidly developing field in environmental engineering. It has a great potential to cope with the increasing pollution by traffic. The addition of a photo catalyst to ordinary building materials such as concrete creates environmental friendly materials by which air pollution can be diminished. TiO2 layer is applied over cement Concrete Slab in order to diminish the air polluting effect by exhaust gasses. In particular, the conversion of Air Pollutant is measured. Effects TiO2is only effective when it is applied on upper surface of concrete in contact with Air .It does not show any effect when it is composited in cement concrete slab. A detailed study of the principles of photocatalysis and of the interaction between TiO2 and Air pollutant is carried out. The laboratory study pointed at the influence of different parameters, such as temperature, relative humidity, light intensity, applied surface, material characteristics and flow rate. An up scaling of the test set-up has been carried out to see the influence of an increase in photocatalytic active surface. In a more global approach, the application of TiO2 as air purifying material is studied to be implemented in the urban and interurban streets and roads. This thesis presents an overview of the principle of photocatalysis and the application in combination with cement. The laboratory researchresults especially towards air purifying action are also discussed. The implementation of this type of material in an urban and interurban area is discussed.