Method for purifying vehicle tail gas by loading composite modified photocatalyst on porous asphalt pavement

Abstract

The invention relates to a method for purifying vehicle tail gas by using a porous asphalt pavement loaded composite modified photocatalyst. The invention belongs to the technical field of functionalpavements, and solves the problems of more water damage, difficulty in catalyst surface enrichment of tail gas, incapability of fully utilizing visible light, low photocatalytic efficiency, poor degradation effect and the like caused by poor dispersity of modified TiO2 nanoparticles loaded on the porous asphalt pavement at present. The preparation method comprises the following steps: firstly activating a carbon molecular sieve, then preparing copper-carbon nanotube co-doped modified TiO2 sol, fully mixing the carbon molecular sieve with the sol, and repeatedly loading the sol for three timesto prepare a carbon molecular sieve / copper-carbon nanotube co-doped TiO2 composite photocatalyst; adding the composite photocatalyst into the porous asphalt mixture for replacement of a part of the fine aggregate according to different proportions; and finally, testing the degradation effect of different doping amounts of the composite photocatalyst on different components in the vehicle tail gasand the influence on the pavement performance of the asphalt mixture, and determining the optimal doping amount of the composite photocatalyst. The method has the advantage of improving the vehicle tail gas degradation effect of the porous asphalt pavement.

Description

technical field [0001] The invention relates to a method for purifying vehicle tail gas loaded with a composite modified photocatalyst on a porous asphalt pavement, which belongs to the technical field of functional pavements. Background technique [0002] In recent years, with the rapid development of my country's national economy and the continuous improvement of the comprehensive transportation network of highways and urban roads, my country's motor vehicle market is in a relatively long development stage due to market demand. However, fuel vehicles emit a large amount of harmful exhaust gas during driving. The main harmful components of vehicle exhaust gas include hydrocarbons, nitrogen oxides, carbon monoxide, carbon dioxide, etc., which have brought serious harm to people's health and the ecological environment. [0003] In recent years, the use of semiconductor photocatalysts to eliminate environmental pollutants is very active, especially the research on photocatalyt...

AI Technical Summary

Problems solved by technology

[0011] The invention is a method for purifying vehicle exhaust with a composite modified photocatalyst loaded on a porous asphalt pavement, which solves the problem of the current modified TiO2 loaded on a porous asphalt pavement. 2 The dispersion of nanoparticles is poor, resulting in poor water stability of porous asphalt pavement, and it is difficult for exhaust gas to 2 Problems such as surface enrichment of nanoparticles, inability to fully utilize visible light, low photocatalytic efficiency, and poor degradation effect