Is photocatalyst useful in removing formaldehyde?

Effective.

Photocatalysts are really useful in removing formaldehyde. Photocatalysts, also known as photocatalysts, originated in Japan at the earliest. When the photocatalyst absorbs ultraviolet and visible light, the pollutants in the air are adsorbed to the surface of the photocatalyst and will be oxidized into carbon dioxide and water to purify the air.

Photocatalyst is not only effective against formaldehyde, but also purifies toxic and harmful gases in the air such as benzene series and total volatile organic compounds. It can also decompose and harmlessly treat the toxins released by bacteria or fungi, so the photocatalyst is reliable for removing formaldehyde.

Now many people know that newly renovated houses need to remove formaldehyde, and photocatalyst is the latest fresh air product, which is favored by many owners who have renovated their new houses. Let's take a look at whether photocatalyst formaldehyde removal is useful. Of course, the application of photocatalyst in household formaldehyde removal has a certain effect, but it also has its limitations.

Under the irradiation of light, the photocatalyst will produce a photocatalytic reaction similar to photosynthesis, which will decompose organic pollutants into non-polluting substances, so it has a strong function of removing formaldehyde and purifying the air. Under light irradiation, the photocatalyst can absorb light energy equivalent to the energy of the band gap, and the surface of the photocatalyst is excited to produce electrons and holes. These electrons and holes have strong reducing and oxidizing abilities and can react with water or confined oxygen to produce hydroxide radicals and super anion ions.

It is through the chemical effect of these ions that formaldehyde is removed from the air. Here I want to remind that the photocatalyst will only work under ultraviolet irradiation, and the ordinary indoor light is weak, and its strength and energy level are not enough to catalyze the photocatalyst, and the amount of decomposition is very limited, so the effect of directly using the photocatalyst for indoor formaldehyde removal is not ideal.

Photocatalyst formaldehyde removal is useful, but the use conditions are also more harsh, such as the need for the participation of light, especially the need for ultraviolet light, as a catalyst, the photocatalyst itself does not participate in the reaction, but must have the participation of light, so the photocatalyst in addition to formaldehyde is generally used in the industry to remove formaldehyde, such as the plate formaldehyde treatment of the plate factory, as well as leather, prevention, industrial production needs to deal with formaldehyde. In recent years, some photocatalysts have been used in formaldehyde treatment in the home environment, in fact, this is not suitable, because the participation of light in the indoor environment is not very sufficient, and the formaldehyde treatment used in the indoor environment is easy to produce secondary pollution and incomplete formaldehyde decomposition. In developed countries in Europe, indoor formaldehyde treatment is generally removed with photophyllin, which originates from the photoreceptor molecules of green plants, and can decompose formaldehyde even in an indoor environment, even in a very weak light environment, and more importantly, it can be completely decomposed.

Photocatalysts. It is coated on the surface layer to form a nano-scale colorless protective film in ultraviolet light.

Catalytic decomposition of formaldehyde, TVOC, and other gaseous organic pollutants under irradiation to turn them into carbon dioxide.

and water. The photocatalyst itself does not react, and after spraying, it will be coated on the surface of the substrate as a film, and under the action of light, it will produce a strong catalytic degradation function: it can effectively degrade toxic and harmful gases in the air.

If this layer is destroyed, harmful substances will be released, and it is possible to produce secondary pollution.

There is also a kind of photophyllin, which is the upgraded material of photocatalyst, photocatalyst is required to participate in light, especially ultraviolet rays, to fully play a role, insufficient participation will cause secondary pollution because of residues, photophyll is extracted from the plant body, can be directly decomposed without light, and it adds decomposition catalyst and penetrant, which can better penetrate and decompose the formaldehyde pollution inside the furniture panel.

The removal rate can reach 99%, which is a formaldehyde removal material widely used by decoration management companies.

Is it useful for photocatalysts to remove formaldehyde? Photocatalyst is a general term for photosemiconductor materials with photocatalytic function represented by nanoscale and titanium dioxide, and is one of the safest materials for controlling indoor environmental pollution in the world.