Madrid, Spain, Applies Titanium Dioxide Photocatalytic Technology on Ring Road

en.Wedoany.com Reported - On November 13, the city of Madrid, Spain, carried out photocatalytic pavement treatment near Avenida de la Ilustración on the M-30 ring road. The project was implemented by Madrid Calle 30, the operator of Madrid's M-30 ring road, using photocatalytic materials containing titanium dioxide to treat the road surface. Solar radiation activates the catalytic reaction, promoting the degradation of nitrogen oxides from traffic emissions. This technology is part of Madrid's road environmental governance measures, and there are plans to extend similar applications to other areas of the city.

The core material of photocatalytic treatment is typically titanium dioxide (TiO₂). Under suitable light conditions, the catalytic material is activated and, with the participation of oxygen, undergoes oxidation reactions that convert some air pollutants into other compounds. For urban roads, the primary target is nitrogen oxides produced by vehicle exhaust. Some of the converted substances can be removed through rainwater washing or road cleaning operations.

The actual treatment effectiveness of this technology is influenced by multiple conditions, including solar radiation intensity, pollutant concentration, active surface area of the material, road traffic volume, and environmental conditions. Therefore, the pollutant degradation capacity of photocatalytic pavement cannot be judged solely based on material configuration; it also needs to be evaluated in combination with the actual application environment and monitoring data.

Madrid has previously had similar technology applications. In 2021, the municipal government sprayed photocatalytic coating on approximately 4,750 square meters of road surface at Plaza de la Elíptica, using about 475 liters of photocatalytic solution, primarily targeting nitrogen dioxide pollution. The M-30 road application this time introduces photocatalytic treatment into the urban ring road traffic environment. The two projects are application cases at different times and locations.

In 2026, the Iberian Photocatalysis Association also published guidelines for the design, construction, and effect control of photocatalytic pavements, covering material performance, construction requirements, quality control, and practical application cases, providing technical references for the engineering application of such road environmental materials.