An energy-saving photocatalytic self-cleaning coating for controlling air pollution in highway tunnels

A photocatalytic self-cleaning coating was developed, which can continuously remove NO under illumination and dark. It also can autonomously recover hydrophobicity and NO purification function by photocatalysis. The adsorption behaviors of NO and H2O on the coating surface were simulated. H2O molecules were preferentially adsorbed relative to NO, indicating that humidity had an adverse effect on NO purification. The statistical analysis of NO concentration in the tunnel showed that this coating effectively improved the air quality in the open space. This study provides an energy-saving and effective way to control air pollution and promote the green development of highway tunnels.

Automated summary

A photocatalytic self-cleaning coating was developed for continuous removal of NO under both illumination and dark conditions. The coating can also autonomously recover hydrophobicity and NO purification function through photocatalysis. Simulation results showed that H2O molecules were preferentially adsorbed over NO, indicating the adverse effect of humidity on NO purification. Statistical analysis of NO concentration in the tunnel demonstrated that this coating effectively improved air quality in open spaces. This study provides an energy-saving and effective method to control air pollution and promote green development of highway tunnels.