将复合光催化材料 TiO₂ -CeO₂ 应用于隧道钢渣沥青混合料中，研究复合光催化材 料 TiO₂ -CeO₂ 对隧道内汽车尾气的降解效能． 首先研发了一套能模拟隧道环境的尾气降解 试验装置，然后研究了复合光催化材料 TiO₂ -CeO₂  对隧道钢渣沥青混合料路用性能的影 响，最后通过降解效能与降解速率的评价得出了复合光催化材料 TiO₂ -CeO₂  在隧道钢渣沥 青混合料中的最佳用量． 结果表明:将复合纳米光催化材料应用于隧道钢渣沥青混合料 中，在纳米 TiO₂ 的掺量为 50%、纳米 CeO₂ 掺量为 0． 7%时会达到光催化效率、光催化效能 的峰值，该掺量下对 NO 和 HC 的降解效率峰值高达 89% 和 95%，30 min 内降解速率分 别高达 626．3 mg/(m³ ·min)和 74． 75 mg/(m³ ·min)，且隧道钢渣沥青混合料的路用性 能符合要求．

The composite photocatalytic material TiO₂ -CeO₂   was incorporated to steel slag asphalt mixture in tunnel environment in order to study its efficiency for exhaust gas degradation． Firstly，a complete set of tail gas degrada- tion test equipment capable of simulating tunnel environment was developed． Then the influence of composite pho- tocatalytic material TiO₂ -CeO₂    on the performance of steel slag asphalt mixture in asphalt pavement was studied． Finally，the optimum doping ratio of TiO₂ -CeO₂   composite photocatalytic material was also studied． The results show that when the nano-TiO₂ volume is 50% and nano-CeO₂ is 0. 7%，the photocatalytic efficiency will reach to the peak value． In this case，the degradation efficiency peak of NO and HC is 89% and 95%，respectively，and exhaust degradation efficiency reach up to 626. 3 mg/ (m³ ·min) and 74. 75 mg/ (m³ ·min) within 30 min，re- spectively． The road performance of tunnel steel slag asphalt mixture meets the requirements．