Objective:
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.
