Graphitic carbon nitride(g-C3N4) was selected as a photocatalyst for the degradation of automobile exhaust. Montmorillonite(DAC-OMMT) was combined with melamine to prepare photocatalytic composites (CNM). The g-C3N4 and CNM-modified asphalt mixtures were prepared. The high-temperature stability,low-temperature crack resistance,and water stability of the modified asphalt mixtures were studied. The photocatalytic degradation effects of g-C3N4 and CNM modifiers and their modified asphalt mixtures on NO,CO,and HC were explored. The results show that the absorbance of CNM is bigger than that of g-C3N4 in the whole wavelength range and is remarkably improved in the wavelength range of 300-480 nm. The high-temperature stability and water stability of two types of modified asphalt mixtures are improved,and the low-temperature crack resistance meets the requirements of the specification. The degradation effect of g-C3N4 and CNM modifiers and their modified asphalt mixtures on NO is better than that of CO and HC,and the degradation efficiency of CNM is better than that of g-C3N4.
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