基于复合纳米光催化材料的隧道尾气降解研究

Study on Degradation of Tunnel Exhaust Gas Based on Composite Nano Photocatalytic Materials

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%,30min内降解速率分别高达626.3mg/(m^3·min)和74.75mg/(m^3·min),且隧道钢渣沥青混合料的路用性能符合要求.

The composite photocatalytic material TiO 2 -CeO 2 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 degradation test equipment capable of simulating tunnel environment was developed.Then the influence of composite photocatalytic material TiO 2 -CeO 2 on the performance of steel slag asphalt mixture in asphalt pavement was studied.Finally,the optimum doping ratio of TiO 2 -CeO 2 composite photocatalytic material was also studied.The results show that when the nano-TiO 2 volume is 50% and nano-CeO 2 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/(m^3 · min) and 74.75 mg/(m^3 · min) within 30 min,respectively.The road performance of tunnel steel slag asphalt mixture meets the requirements.