The Decontamination of Vehicle Emissions NO_xthrough Nano-TiO₂ Immobilized on the Surface of Concrete and Asphalt Road

With the increase of the automobile amount, the atmosphere pollution for the automobile emission becomes very serious day by day. In the paper, we have studied vehicle emissions of decontamination by using nanometer titanium dioxide of photocatalysis method in traffic environment. Based on concrete and asphalt road material different characteristic, we used the different matching scheme of TiO₂ respectively, and utilized permeability technology and coated film technology to make environmental protection materials of concrete and asphalt nano-TiO₂. In order to test degeneration efficiency of the materials, we have carried on the indoor simulation test by a kind of testing system that was designed by us. The test result indicated: Their effective degeneration efficiency may achieve 30% and the photocatalytic activity may achieve 0.01 cms^–1. On the basis of this research, the productions were used in road environment. The decontamination effect was tested by contrast test in TIO₂ spraying section with non-spraying section. The experiment showed that decontamination rate of the productions was from 6% to 12%.