Effect of Different Adding Methods of Nano-TiO2 on Photocatalytic Degradation of Automobile Exhaust on Asphalt Mixture
As to photocatalytic degradation of automobile exhaust by TiO2 nanomaterials loaded on asphalt mixtures, the paper investigated that the effect of different adding processes of nano-TiO2 on the photocatalytic degradation efficiency on asphalt mixture. First, the nano-TiO2 was modified by surface modification, and its hydrophilicity was changed to lipophilicity. Then, the study discussed the effects of nano-TiO2 adding processes and asphalt mixture types in the form of filler (dry processes) and in the form of asphalt additive (wet processes) on photocatalytic performance, through photocatalytic performance test. The test results show that: the degradation efficiency of porous asphalt mixture was 12% higher than that of dense gradation asphalt mixture, because contact area between photocatalyst and UV light in porous asphalt mixture was higher. The photocatalytic degradation efficiency of dry processes was about 33%, which was higher than about 22% of being added into the asphalt mixture using wet processes. When dry processes was employed, the photocatalytic degradation efficiency increased with the nano-TiO2 increasing, and reached the maximum of 35%, and then decreased. Through analysis, dry processes had a unique advantage that nano-TiO2 and mineral powder homogeneously mixed, hindered the agglomeration of Nano-particles, which makes it better in the dispersion, and thus exhibits better photocatalytic performance.
This work was supported by funding from Tianjin major science and technology research program (16ZXCXSF00110), Tianjin application and advance technologies program (15JCYBJ23100), Hebei province natural science fund projects (E2016202279), Tianjin high education development funds (20140918).
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