隧道内壁TiO2光催化涂层净化效果试验研究

Experimental Study on Purification Performance of TiO₂ Photocatalytic Coating on Tunnel Lining

摘要:

针对人车混行公路隧道尾气污染治理难题，通过模拟隧道环境，系统评估了TiO₂光催化涂层在侧壁装饰材料上的净化效果与相关性能。试验采用有机-无机复合交联技术制备的纳米TiO₂涂层，在16 W的LED光源照射下对NO?和SO?表现出显著降解能力，12 h实际净化效率分别达13.0%和7.2%。清洁性能测试表明，涂层表面超亲水特性使其除油率提升至76.74%，且经酸碱溶液浸泡后仍能保持良好的亲水性，证实其具有优异的抗污与耐腐蚀性。该技术可直接喷涂于隧道内壁，可有效降低人车混行公路隧道污染物浓度，节约通风能耗，为绿色隧道运维提供借鉴。

Abstract:

To address the challenge of exhaust pollution control in highway tunnels with mixed pedestrian and vehicle traffic, this study systematically evaluated the purification efficiency and performance of TiO₂ photocatalytic coatings applied to sidewall decorative materials through simulated tunnel environments. The experiment employed an organic-inorganic composite crosslinking technology to prepare a nano-TiO? coating, which demonstrated significant degradation capabilities for NO₂ and SO₂ under illumination with a 16 W LED light source, achieving practical purification efficiencies of 13.0% and 7.2% after 12 hours, respectively. Cleaning performance tests demonstrated that the superhydrophobic surface properties of the coating enhanced its oil removal rate to 76.74%, while maintaining a well hydrophilicity after immersion in acid/base solutions, confirming its excellent anti-fouling and corrosion resistance. This technology can be directly sprayed onto tunnel inner walls, effectively reducing pollutant concentrations in mixed-traffic road tunnels, saving ventilation energy consumption, and providing reference for green tunnel operation and maintenance.