Heat-sensitive photocatalytic spray gel and preparation method thereof

Abstract

The invention provides a heat-sensitive photocatalysis spray gel that is prepared from the following components in parts by weight: 2-4 parts of a photocatalytic material, 0.025-0.05 part of sodium alginate, 5-10 parts of heat-sensitive cellulose and 500-1000 parts of deionized water, wherein the photocatalytic material is chitosan-loaded platinum and iodine co-doped modified titanium dioxide nanopowder; the invention also provides a preparation method, which comprises the following steps: respectively adding sodium alginate and heat-sensitive cellulose into deionized water with the temperature of 80-100 DEG C, uniformly stirring, naturally cooling to room temperature, mixing, adding the photocatalytic material into the mixed solution, mixing, and carrying out ultrasonic dispersion to obtain the heat-sensitive photocatalytic spray gel. According to the invention, the thin film formed after spraying is good in stability and not prone to crystallization, fragmentation and falling off; when recycling is needed, hot water can be used for making contact with the thin film to make the thin film become a hydrogel state, the thin film can be easily and completely recycled from the surfaceof an object, the surface of the object cannot be damaged, and the indoor PM2.5 purification effect is remarkable.

Description

technical field [0001] The invention belongs to the technical field of air purification, and in particular relates to a heat-sensitive photocatalytic spray gel and a preparation method thereof. Background technique [0002] Photocatalytic technology has basically verified its effectiveness in the field of indoor air purification. In practical application, most of the products using photocatalytic technology are used in the form of spray or solid gel. [0003] The form of spray can better and more evenly disperse photocatalytic materials in the indoor space, increase the effective contact between active particles and pollution components, and then strengthen the effect of photocatalytic purification, but after spraying and forming a film, with time As time goes by, the active ingredients in the photocatalytic film will be deactivated, and the film will crystallize and gradually crack and fall off. Since the formed film is difficult to distinguish with the naked eye, it is e...

AI Technical Summary

Problems solved by technology

[0003]The form of the spray can disperse the photocatalytic material in the indoor space better and more uniformly, increase the effective contact between the active particles and the pollution components, and then strengthen the effect of photocatalytic purification However, after spraying it and forming a film, as time goes by, the active ingredients in the photocatalytic film will be deactivated, and the film will crystallize and gradually crack and fall off

Since the formed film is difficult to distinguish with the naked eye, it is even more difficult to collect all the photocatalytic materials after deactivation and fragmentation, which makes it impossible to completely recover the photocatalytic materials, which in turn easily causes secondary pollution to the environment; moreover, once the spray is sprayed and adhered, It is also difficult to completely remove in a short time, and as the film crystallizes and peels off, it may cause certain damage to the surface of the item

The form of the solid gel is to confine the photocatalytic material in the container and purify the air by slowly releasing the active particles. Although the photocatalytic active ingredient is deactivated, it can be recycled well because it remains in the container. The photocatalytic material avoids the secondary pollution problem, and does not directly contact with the article, avoiding possible damage to the surface of the article, but due to the limited space of the container, the active particles need to be further diffused to increase the effective contact with the polluting components, resulting in photo Catalytic air purification is less effective than in spray form

In addition, most of the photocatalytic spray or gel products currently on the market focus on the functions of purifying formaldehyde, disinfecting, antibacterial or deodorizing, etc., and are targeted at the purification of PM2.5, a key indicator of real air quality in the reaction room. weaker

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