LAUSR

The preparation of high degradation rate and recyclable photocatalytic material for automobile exhaust degradation is a hot and difficult issue in the field of automobile exhaust degradation. In this paper, a modified Rubber-Titanium-Aluminum(RTA) degradation material based on TiO2/Al2O3 composite carrier was prepared. The effects of particle size, RTA content, initial concentration of NO2, light source type, light intensity, ambient temperature and humidity on the degradation effect of RTA were studied by the self-designed indoor test equipment, and the skid resistance performance, noise reduction performance, durability, impermeability and repeatability of NO2-degradation of the RTA ultrafine grained micro-surfacing material were further studied. The results showed that compared with pure nano-TiO2, RTA had a higher degradation rate of NO2, and the smaller the particle size of RTA was, the higher the degradation rate was. With the increase of the RTA content, the NO2-degradation rate of the material also increased, but there was an upper limit. RTA could achieve the best effect of NO2-degradation under the appropriate temperature and suitable wavelength of the light source, but the air humidity and light illumination had little effect on the degradation rate of NO2. Moreover, the higher the initial concentration of automobile exhaust was, the smaller the degradation rate of NO2 was. In addition, the RTA ultrafine grained micro-surfacing material had good durability, which could improve the skid resistance performance, noise reduction performance and impermeability of the pavement. The effect of automobile wear on RTA’s ability of repeated NO2-degradation was not significant. With the skid resistance, degradation rate, durability and economic benefits taken into account, the optimum coating amount of RTA was 800 g.m−2.