Catalytic ozonation material as well as preparation method and application thereof

Abstract

The invention provides a catalytic ozonation material. Modified activated carbon is taken as a substrate, the surface of the substrate is coated with a SiO2 film, and transitional metal oxide is arranged on the surface of the SiO2 film, wherein according to the mass fraction, the modified activated carbon accounts for 40-80% of the catalytic ozonation material, the SiO2 accounts for 5-50% of the catalytic ozonation material, and the transitional metal oxide accounts for 1-15% of the catalytic ozonation material. The catalytic ozonation material is high in catalytic efficiency, good in stability and long in service life, and the removal rate of high-concentration VOCs is always 100%; the catalytic ozonation material can make full use of ozone, improve the efficiency of performing catalytic ozonation on gaseous pollutants, save the using amount of the ozone and reduce energy consumption; meanwhile, the transitional metal oxide has good capability of catalytically decomposing the ozone and organic matters and can completely decompose the ozone, so that no residual ozone is produced and secondary pollution can be avoided.

Description

technical field [0001] The invention relates to the technical field of preparation of ozone catalytic oxidation materials, more specifically, to an ozone catalytic oxidation material and its preparation method and application. Background technique [0002] In recent years, PM2.5 and ozone have become the culprits of haze weather in various cities, and volatile organic pollutants (VOCs) are the precursors of ozone and PM2.5. At the same time, VOCs have three effects of teratogenicity, carcinogenicity and mutagenicity, which cause great harm to the human body and pose a huge threat to the ecological environment. They are called "shadow killers". Therefore, the governance of VOCs is of great significance, and it is listed as an important control indicator of the "13th Five-Year Plan". [0003] Among the many VOCs treatment processes, advanced oxidation technology has received more and more attention. Ozone is a strong oxidizing agent, its standard electrode potential is 2.07V...

AI Technical Summary

Problems solved by technology

But in general, there are problems to be solved in this technology: on the one hand, the traditional ozone catalyst has poor ozone decomposition performance and poor stability, and the catalyst cannot make full use of ozone, resulting in low efficiency of waste gas treatment. At the same time, residual ozone will also cause Secondary pollution and waste of resources; on the other hand, only part of VOCs is converted into CO in some ozone catalytic oxidation reactions 2 , the remaining VOCs generate a large amount of toxic by-products CO

[0005] Chinese invention patent CN102626629 discloses a supported metal oxide catalytic oxidation catalyst, which uses ceramic filter balls as the carrier, nickel nitrate solution as the active component, and is prepared through steps such as washing with water, acid soaking, drying, and roasting. It is used to degrade p-nitrophenol, a pollutant in static water, but the material has the disadvantages of secondary pollution by residual ozone, and it is not suitable for the degradation of gaseous pollutants in continuous flow; Chinese invention patent CN105312061A discloses a catalytic material for removing ozone at room temperature. Porous activated carbon and molecular sieve-based composite materials with high specific surface area are used as carriers, loaded with one or several non-precious metal oxides as active components, and loaded with one or several reducing protective agents

This material has a good decomposition efficiency for ozone, but it cannot use ozone to degrade pollutants, resulting in waste of ozone