In view of the low catalytic degradation efficiency of traditional photocatalytic materials in asphalt pavement,three kinds of metal(Cu,Fe,Mn)doped cerium oxide composite materials were synthesized using a combination of metal doping and co-precipitation methods.The evolution of their phase composition,changes in functional groups and extension of light absorption range were investigated.The high dispersion effect of CeO2 on the negative support was achieved,and the photoresponse of the new photocatalytic composite was improved.The rheological properties,high-temperature performance,aging resistance,and exhaust gas degradation efficiency of asphalt modified with different photocatalytic composite materials under gradient doping conditions were studied.The results show that the introduction of transition metal cations can reduce the band gap of the composites.When the dosage of photocatalytic composite materials is 4%(mass fraction),the high-temperature rheological properties,resistance to high-temperature deformation and aging resistance of the modified asphalt are significantly improved.When the dosage is 6%,Fe3+-doped CeO2 supported on pillar-modified montmorillonite has the best catalytic effect,achieving a degradation efficiency of 59.6%for NO,and an increase of 17.3%in degradation efficiency.
关键词
光催化/金属掺杂/改性沥青/老化性能/尾气降解
Key words
photocatalysis/metal doping/modified asphalt/aging performance/exhaust gas degradation
维普
万方数据