NO2浓度对水泥基材料负载纳米TiO2光催化性能的影响

研究鉴于汽车尾气排放后首先与路面材料接触的事实,探讨路面材料负载光催化剂实现尾气二次净化的目的.针对路面水泥基材料负载纳米TiO2光催化氧化汽车尾气中的氮氧化物,首重研究模拟气源NO2的浓度对催化反应的影响.试验和分析表明,水泥基材料负载纳米TiO2光催化氧化NO2浓度提高呈线性下降:水泥基材料负载纳米TiO2光催化反应速率随NO2浓度提高而加快;若载体具有吸附被光催化氧化气体的能力,可加快负载TiO2的光催化反应.

Effect of concentration of nitrogen oxidizes on photocatalytic oxidation efficiency of nano TiO2 photocatalyst immobilized on cement-based material

With the development of automobile industry, the tail gas of motor rehicles is one of major air pollution sources. It investigates nano TiO2 photocatalyst immobilized on cement - based material photocatalytically oxidizes nitrogen oxides at various concentration. The efficiency of photo - catalysis decreases with the increase of the concentrationof NO2 at the range of 0.2 mg/m^3 to 2.0mg/m^3. When the concentration of NO2 is as low as less than 0.5mg/m^3, the efficiency of photo -catalytic degradation is not evidently affected by the illumination intensity. When the concentration of NO2 is over 2.0mg/m^3, the efficiency of photocatalytic degradation will increase with the enhancement of the illumination intensity. It also shows the speed of photocatalysis rises with the improvement of adsorption of photocatalyst carriers.