A visible light catalytic composite material for absorbing and decomposing road vehicle exhaust and its preparation method

Abstract

The invention relates to a visible light catalysis composite material for absorbing and decomposing pavement automobile exhaust as well as a preparation method thereof. The composite material consists of porous minerals containing nano materials, wherein the nano materials are nano CaCO3 and nano Ag2O / TiO2; the porous minerals are one or more than two of silicon gel, zeolite, pumice, montmorillonite, ceramsite, tourmaline or sepiolite. The invention also provides the preparation method of the composite material. The visible light catalysis composite material for absorbing and decomposing pavement automobile exhaust can effectively adsorb automobile exhaust on the surfaces of photocatalysis particles to decompose the automobile exhaust, and convert NOx into calcium nitrate finally, and the pavement automobile exhaust absorption and decomposition efficiency is high; the catalysis composite material is wide in absorption spectrum range, and has high catalysis activity in a visible light region; moreover, the surface of the composite material is also subjected to spraying or immersing treatment by a silane coupling agent, and has favorable bonding force with bituminous pavements.

Description

Technical field [0001] The invention relates to a visible light catalytic composite material for absorbing and decomposing road vehicle exhaust gas and a preparation method thereof, which is suitable for the degradation of road vehicle exhaust gas on urban roads, parking lots, tunnels, toll stations and the like, and belongs to the technical field of new material preparation. Background technique [0002] Automobile exhaust pollution is environmental pollution caused by exhaust gas emitted by automobiles, and is one of the prominent environmental problems caused by road traffic. With the increase in the number of cars and the wider use of them, a pollutant emission area with a higher concentration and a longer duration is often formed over the area near the highway. The negative effects of automobile exhaust on the world environment are also increasing, seriously endangering the urban environment, causing respiratory diseases, and aggravating the urban heat island effect. Accord...

AI Technical Summary

Problems solved by technology

However, these existing methods all have some difficult problems in terms of economy or practicability.

In September 2007, the "car-free day" was tried out in several major cities in my country and Beijing's "odd and even number travel"; Shanghai implemented a multi-year licensing policy; in 2010, five cities including Beijing, Shanghai, Guangzhou, Tianjin and Guiyang began to implement car Purchasing restrictions, and in July 2013, the China Automobile Association predicted that Tianjin, Shenzhen, Hangzhou, Shijiazhuang, Chongqing, Qingdao, Wuhan and other 8 cities may implement purchase restrictions; although these administrative control measures can largely limit exhaust emissions, improve Air quality, but this measure is very difficult to manage and control, and it brings certain difficulties to the travel of residents. It is a method that treats the symptoms but not the root cause; There are also certain difficulties in promotion and application; although three-way catalysts have been researched and applied for many years, there are still many difficult problems to solve, such as cold start problems, cost problems, etc.; some of the existing international environmental protection coatings are researched in recent years It is popular, but it is still in its infancy in China, and it is still difficult to apply it with a large amount of engineering

[0005] However, TiO 2 As a wide bandgap semiconductor material, it has high photocatalytic activity, low utilization rate of solar energy, wide bandgap (3.2ev for anatase), and can only absorb ultraviolet radiation with a wavelength less than 387.5nm; moreover, the photocatalytic reaction belongs to Surface reaction, in order to catalyze the decomposition of automobile exhaust, the exhaust gas must first be adsorbed on the surface of catalyst particles, these shortcomings seriously restrict the practical industrial application of photocatalytic technology

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