制备出高效的石墨相氮化碳/二氧化钛(g-C3N4/TiO2)复合光催化剂,将其加入到基质沥青中形成 g-C3N4/TiO2型光催化沥青,利用红外光谱(FT-IR)和原子力显微镜(AFM)表征手段研究g-C3N4/TiO2对沥青性能的影响;然后将g-C3N4/TiO2材料用于单层碎石封层去除汽车尾气中的一氧化氮(NO)气体。降解实验结果表明:g-C3N4/TiO2对NO的降解效率为82.47%。FT-IR测试发现g-C3N4/TiO2和沥青之间的吸附抑制了羧基(CO)的形成,导致了亚砜基(SO)光谱强度为老化光催化沥青>老化沥青>基质沥青。AFM测试表明g-C3N4/TiO2光催化剂的加入使沥青表面更为光滑。应用研究证明在碎石封层中加入138g/m2的光催化剂对NO降解效率达到13.96%。
The high-efficient g-C3N4/TiO2 composite photocatalyst was prepared,and added to matrix asphalt to form g-C3N4/TiO2 photocatalyst asphalt.The effect of g-C3N4/TiO2 on the performance of the asphalt were studied by FT-IR and AFM characterization methods.Furthermore,g-C3N4/TiO2 asphalt was added into chip seal to remove nitric oxide (NO) in automobile exhaust.The degradation experiment results showed that NO degradation efficiency of pure material was 82.47%,which was about 2 times compared with TiO2.FT-IR test showed that adsorption between g-C3N4/TiO2 and asphalt inhibited the formation of CO group.However,for the strength of sulfoxide base:aging photocatalytic asphalt>aging asphalt>matrix asphalt.AFM test showed that addition of g-C3N4/TiO2 photocatalyst made a more smoother asphalt surface.The results showed that the best NO degradation efficiency was 13.96% when the amount of photocatalyst was 138g/m2.
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