The NOx Degradation Performance of Nano-TiO2 Coating for Asphalt Pavement

TLDR

This study evaluated the NOx degradation performance of nano‑TiO₂ coatings for road surfaces. The authors prepared nano‑TiO₂ coatings with activated carbon, silane coupling agent, and deionized water, varied component ratios, and tested NO and NO₂ degradation under simulated road conditions using a custom photocatalytic system. The coatings exhibited strong photocatalytic NO and NO₂ degradation, with optimal performance at a nano‑TiO₂ to surfactant ratio of 1:2 and improved bonding when an appropriate amount of silane coupling agent was used.

Abstract

The NOx degradation performance of nano-TiO2 as a coating material for the road environment was evaluated in this research. The nano-TiO2 coating materials for both road surface and roadside were prepared by using anatase nano-TiO2, activated carbon powder, silane coupling agent and deionized water. The impact of varying amounts of coating material and silane coupling agent were evaluated. The road environment of NOx degradation was simulated by the photocatalytic test system designed by the research team. For the road surface coating, the photocatalytic degradation experiments of NO under different radiation intensities were carried out. The results show that the material has good photocatalytic degradation performance, and the proper amount of silane coupling agent can enhance the bonding performance of the material and asphalt mixture. For the roadside coating, sodium dodecylbenzene sulfonate was selected as the surfactant to carry out the photocatalytic degradation experiment of NO2 with different dosages of surfactant. The results showed that when the mass ratio of nano-TiO2 and surfactant was about 1:2, the catalytic degradation effect of the material was the best.