Micro-coating Characteristics of Emulsified Asphalt on 3DOM TiO2 Fog Sealing Material
The combination of three-dimensional ordered macroporous titanium dioxide(3DOM TiO2)and fog seal-ing technology was employed to degrade automobile exhaust on the road surface which can reduce the agglomeration phenomenon of nano TiO2 to improve the degradation effect of exhaust gas.However,the relationship between the micro-coating characteristics and its macroscopic degradation performance of 3DOM TiO2 should be further re-searched after the emulsified asphalt was emulsified.Therefore,scanning electron microscopy(SEM),physical ad-sorption test(BET),and mercury intrusion porosimetry(MIP)were first used to test and analyze the surface mor-phology,specific surface area,pore size distribution,and pore volume of 3DOM TiO2 particles with different pore sizes(200～500 nm)before and after being coated with emulsified asphalt.Subsequently,an independently designed photocatalytic performance testing and analysis system was utilized to evaluate the degradation efficacy of 3DOM TiO2 fog sealing material with different pore sizes on NOx emissions.By considering the influence of pore size on the micro-coating characteristics of 3DOM TiO2,the relationship between the micro-coating characteristics and its macroscopic degradation performance was analyzed.The research results show that when the pore size is 300 nm,the effective pore and specific surface area of 3DOM TiO2 particles coated with asphalt in the material are the largest,and degradation rate is the highest.When the content of photocatalyst is 2％and the pore size is 300 nm,the degradation rate of 3DOM TiO2 fog coating material is 15.1％higher than that of nano TiO2 fog coating material;Furthermore,which is 5.2％and 12.5％higher than that of 3DOM TiO2 fog coating material with 200 nm or 500 nm pore sizes respectively.
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