Purification effect on runoff pollution of porous concrete with nano-TiO2 photocatalytic coating

With the rapid development of cities, more attention has been paid to the stormwater runoff pollution on roads. In this paper, a kind of photocatalytic water purification pavement coated with nano-TiO 2 was developed, which could improve the water purification performance of porous concrete. Through removal rate analysis of three typical pollutants, the improvement of its water purification performance was evaluated. The skid resistance of road surface and durability of purification effect were also studied by using pendulum apparatus and artificial accelerated aging method. The results showed that the removal rates of COD , TP and NH 3 -N could reach 50%, 60% and 40%, respectively. The application of photocatalytic coating would reduce skid resistance of pavement relatively. Besides, appropriate increase of nano-TiO 2 content will improve the weather resistance. This study will provide useful insights for the preparation of nano-TiO 2 photocatalytic coatings for porous cement concrete to improve the water purification effect of roads.