Functional Comparison Test Analysis Of Nano Photocatalytic Composite Material Coating On Asphalt Pavement

With the rapid development of economy in our country,the quantity of motor vehicles is increasing,which causes growning concern about environmental problems of the road.Near-surface atmospheric pollution caused by vehicle exhaust agglomeration and the dual environment influence due to oil pollution of road surface which flow into water and partially evaporate into the atmosphere cannot be ignored.In order to improve environment of the road,a photocatalytic composite material loaded on the pavement is optimized to handle oil pollution on pavement and nitrogen oxide in the air through experiment analysis,because the nanometer composite material has good photocatalytic degradation effect.First of all,the characteristics of the nano materials,methods to improve the photocatalytic activity and photocatalytic mechanism of nano materials are described briefly.The photocatalytic nano raw materials selected and the manufacturing process of three kinds of nanometer composite material that the test requires are introduced.And through the different material characterization methods which can analyze the reasons why the composite material is superior to single photocatalyst,such as scanning electron microscope,X-ray diffraction and infrared spectrum.The preparation process of the photocatalytic coating material is introduced.And a laboratory test method for determining the treatment effects of coating materials on oil and NO is proposed,with some evaluation indicators,such as the content of petroleum substances,and the content of Nitrogen inorganic substances,which mainly includes nitrates and nitrites.In the initial simulation test,the research on dealing with oil pollution and nitric oxide through coating nano composite materias such as Fe₂O₃-TiO₂,Fe₂O₃-ZnO and TiO₂-CeO₂ on the surface of Petri dish is carried out,then discusses the effect on degradation such as photocatalytic material dosage,light intensity and reaction time,and compares the test results for each composite material.The results show that,the photocatalytic degradation rate varies with change of the test conditions.Each composite material can effectively degrade oil and NO with the photocatalytic material dosage of 13.3g/m²,the light intensity of 20W/m² and the reaction time of 2h.Also,it can conclude that the photocatalytic degradation of performance of test groups loaded with composite nanometer material of Fe₂O₃-TiO₂ is more prominent than other test groups by comparative analysis.Finally,the experimental study of photocatalytic degradation which applies the composite material of Fe₂O₃-TiO₂ to asphalt concrete pavement is carried out basing on the above experimental conclusion.The results show that the asphalt pavement loaded with composite materials can effectively degrade oil on pavement and NO,and repeating rounds will cause certain influence on the degradation effect of the coating material,which needs further research.Through these simulation tests in laboratory,the photocatalytic degradation effect of oil pollution on pavement and nitrogen oxide are studied in this paper.So the research result can provide a theoretical basis for the further research work,and it has great value to environmental protection in road engineering.