Photocatalyst filter screen of a visible light responsive air purifier and preparation method thereof

Abstract

The invention discloses a visible-light response type air purifier photo-catalyst filter screen. The visible-light response type air purifier photo-catalyst filter screen comprises a filter screen substrate, wherein the surface of the filter screen substrate is coated with a catalyst carrying layer; an adhesive layer is arranged between the filter screen substrate and the catalyst carrying layer; the catalyst carrying layer comprises a composite adsorption material with a microcellular structure and a photo-catalyst active component loaded in the composite adsorption material; the photo-catalyst active component comprises a titanium dioxide-perovskite composite photo-catalyst AB(1-x)CxO3 / TiO2, wherein A, B and C represent metal elements; the value range of the doping ratio x is within 0-1; the catalyst carrying layer comprises the following components in percentage by weight: 2-50% of the titanium dioxide-perovskite composite photo-catalyst and the balance being the composite adsorption material with the microcellular structure. According to the visible-light response type air purifier photo-catalyst filter screen provided by the invention, the catalyst carrying layer is firm and is high in adhesion to the filter screen substrate; the visible-light response type air purifier photo-catalyst filter screen is high in purification effect, low in energy consumption and free of secondary pollution; the service life of the filter screen is greatly prolonged; meanwhile, the filter screen has the high photo-catalytic performance on visible light.

Description

technical field [0001] The invention relates to the technical field of air purification, and relates to a manufacturing process of a visible light responsive photocatalyst filter screen with a firm carrier layer for catalytic purification of air at room temperature. Background technique [0002] After entering the 21st century, people have become more and more aware of environmental protection. This awareness of environmental protection is not only reflected in the natural environment in which they live, but also in the environment in which they live; The peculiar smell and the increasingly prominent environmental pollution have brought harm to people's health and life; reducing pollution as much as possible and creating a green and safe living environment have become the goals pursued by people. [0003] At present, various air purifiers mainly use strong adsorption porous materials to physically adsorb organic pollutants and photocatalytic materials to decompose organic po...

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Problems solved by technology

[0003] At present, various air purifiers mainly use strong adsorption porous materials to physically adsorb organic pollutants and photocatalytic materials to decompose organic pollutants: Although physical adsorption materials can absorb many bacteria and dust, their service life is short, Frequent replacement is required, resulting in high replacement costs; nano-photocatalytic materials are mainly nano-TiO 2 As a photocatalyst to degrade VOCs in the air, this process does not require other chemical additives, the reaction conditions are mild, and the final product is only CO 2 and H 2 o

However, the adsorption performance of TiO2 photocatalyst is poor, and the concentration of organic pollutants in the air is often relatively low, so it is difficult to effectively enrich the surface of TiO2, thereby reducing the The photocatalytic efficiency of indoor and outdoor low-concentration volatile organic compounds has been improved; CN100551534C has invented a kind of titanium dioxide / activated carbon fiber photocatalyst, but manufacturing process is complicated, and cost is higher, and the photocatalyst filter screen that existing air purifier uses adopts coating method at present The photocatalyst is added to the filter coating, but the catalytic layer of the photocatalyst filter will lose powder during use, and the fallen catalyst ultrafine powder will be blown into the environment, which will easily cause secondary pollution, and the purification effect of the purifier will also decrease rapidly.

[0004] Currently widely used TiO 2 Photocatalytic materials can efficiently degrade organic pollutants in the air at normal temperature and pressure, have good stability and high catalytic efficiency, and are an ideal photocatalyst; however, nano-TiO is currently on the market 2 The product is mainly nano TiO 2 Powder dispersion system, most of these systems have poor stability and greatly reduced photocatalytic performance due to the use of various polymer organic dispersion stabilizers for surface modification

More importantly, TiO 2 The light absorption band is narrow, and the band gap energy Eg≈3.2Ev of anatase can only generate electron-hole pairs (e - -h + ), which mainly uses ultraviolet light below 387.5 nm, which radiates to the ground and only accounts for about 4% of the total light radiation; therefore, artificial light sources are used at present, and the energy consumption is high. Extending the use range to visible light can greatly reduce equipment investment and operating costs

[0005] It can be seen that the existing air purifiers obviously still have inconveniences and defects in structure and use, and further improvement is urgently needed

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