for Xiaobai, in front of all kinds of formaldehyde removal methods on the Internet, he feels like suffering from a selective barrier. I used to be a member of Xiaobai, but with further understanding, I was able to remove most of the confusion. Indoor formaldehyde removal methods mainly discussed on the Internet include green plants, activated carbon, formaldehyde removal spray, photocatalyst and ventilation. Now follow to understand it!
1 It is generally said that the leaves can absorb formaldehyde and other toxic gas molecules in the air, and play a role in purifying the air. There is no scientific explanation for the specific principle. Take it seriously for the moment, because it will not hinder the final conclusion. As for whether formaldehyde is decomposed and absorbed after adsorption, there is no strong evidence.
the leaves of green plants are not big, so more leaves are needed to absorb more formaldehyde to form larger contact area. Moreover, the efficiency of formaldehyde adsorption by leaves is also a problem. The main processing flow of green plants is the production of organic matter by photosynthesis. The adsorption of formaldehyde and other molecules is not the main function of plants, that is to say, plants have not done a lot of work. On the other hand, our houses are not suitable for a large number of green plants. No one hangs all over the house, and even primitive people do not. The function of residence is to live, not garden, which determines that the indoor green plants can only have a little adsorption surface, and can only absorb a little formaldehyde.
don’t forget that beautiful green plants have side effects, such as breeding insects and bacteria, and releasing carbon dioxide when there is no light. The more green plants indoors, the more by-products they accumulate, and the more pollution they cause indoors. This is one of the reasons why it is not suitable to place a large number of green plants indoors.
therefore, it is impractical to place our hope on using green plants to remove formaldehyde. We’d better use green plants as an ornament of interior decoration, which is more in line with the actual needs. I only put a green pineapple more than 1 meter long on the TV cabinet in the living room. The green vines extend on the white cabinet, and the green full leaves stretch on the curly branches, which is very beautiful.
2 Activated carbon, such as
activated carbon, diatom mud, Mayan blue, etc., can adsorb molecules in the air. More importantly, it has rich microporous structure, which is equivalent to expanding the internal contact area with the air, so it has strong adsorption capacity. Pay attention to contact the surface of activated carbon with air. If you put a bag of carbon in the room, it doesn’t work. Activated carbon can adsorb many molecules at the same time, the adsorption efficiency of different molecules is different, and the adsorption efficiency of formaldehyde is not high.
in terms of adsorption capacity, activated carbon is higher than green plant, and green plant is the least effective method in this answer.
activated carbon materials have some small effects if they are arranged in a large area indoors, but I do not recommend them. Considering their functions together with the following factors, we will feel that the cost performance is very low.
activated carbon is a kind of physical adsorption. If the adsorbed molecules are not cleaned up, they will accumulate and saturate, unable to adsorb new molecules. If it is not cleaned up, a large number of toxic gas molecules are accumulated in the activated carbon materials, which not only can not play the role of adsorption, but will become a pollution source. Using this kind of material, the way to clean it regularly is to expose it to the sun and ventilate it, so as to discharge the molecules adsorbed inside. However, how much performance can be recovered after reduction needs to be discounted. If the requirements are high, they can be replaced regularly.
to sum up, activated carbon materials also need to be arranged in a large area to effectively absorb formaldehyde. It is obviously not feasible to place activated carbon and Maya blue in a room. If the paint is painted on the wall, like diatom mud, how to regularly clean up the internal adsorption has become a problem. In the face of the continuous release of formaldehyde, activated carbon materials need to clean up the adsorbed things in a short time, otherwise the adsorption will be greatly reduced or even ineffective, which will bring a lot of workload to users. Some air purifiers claim to be able to remove formaldehyde, which is actually the function of activated carbon filter, and the situation is similar to this one. Overall, the cost performance of activated carbon is not high.
3 The formaldehyde removal sprays
green plants and activated carbon are for free formaldehyde in the air, and the formaldehyde removal sprays are for formaldehyde in furniture and jewelry. In addition to formaldehyde spray is a general term, there are sealing agent, catching agent, most of which can be sprayed on the surface of the article, can also be applied on the surface of the article with a brush. Spray a layer of agent on the surface of the board to make it penetrate into the shallow surface of the board, which can work for a long time and avoid being erased. Photocatalyst is also spray, but due to different working principles, it is put into the next category.
sealant, as the name suggests, is to seal up formaldehyde. The sealer is a palliative but not a permanent cure. Formaldehyde is still in it. It is only hindered by the sealing layer and the release becomes slow.
capture agent can capture and decompose formaldehyde molecules. This is a real chemical reaction to remove formaldehyde and decompose formaldehyde into water and ammonia, which is worth recommending. Since it is a chemical reaction, there is a consumption of capturing agent, and it will not have any effect after consumption. This is a process of synchronous attenuation. The scavenger and formaldehyde decrease in the reaction.
back to our original purpose, is to reduce indoor formaldehyde concentration to a safe level, these two methods can play a role in reducing formaldehyde emissions, is a feasible scheme. A construction can be used for several years, and there are no side effects. Most of the indoor air treatment companies in the market use the combination of these two methods and photocatalyst methods. Personal purchase and construction, pay attention to the reagent may make the surface of furniture discoloration, construction before the best small-scale trial to confirm.
photocatalyst can be regarded as a high-tech product, with a high cold temperament in its name. Photocatalysts are TiO2, WO3 and other oxides, which act as catalysts under light to oxidize formaldehyde and other molecules into H2O and CO2. The light energy consumed in the process of decomposition can be easily obtained in our environment, even for free. Like the spray above, it is recommended.
other products have bad side effects, but photocatalyst has good side effects. It can not only decompose formaldehyde and other toxic gas molecules, but also remove odor molecules, which is equivalent to deodorization, but also decompose and destroy the cell membrane of bacteria, which is equivalent to sterilization.
seeing the outstanding function of photocatalyst introduced above, it is estimated that Xiaobai are already in love and are ready to invite them in. As a matter of fact, all photocatalyst businesses have long regarded these as advertising slogans and posted them in the windows of some treasure, some cat, some East and some shopping malls. The difference between me and them is that I tell you to put back the wallet you have already taken out and start after you see the following two points clearly:
a. Light is required for photocatalyst to have catalytic effect. Part of the photocatalyst needs to be excited under ultraviolet light, and usually it needs ultraviolet light to get ultraviolet light, or let the sun shine directly in, and the middle can’t be separated from the glass, which is obviously not suitable for home. The other part of photocatalyst can be excited under visible light, but the light intensity is required, and it does not work if the intensity is lower than a certain value. Under the weak light condition of general indoor lighting, the photocatalyst which can still work is rare.
b and photocatalyst have high requirements on the technology of nano materials, which can not work when ordinary nano titanium powder is washed into the solution and coated on the plate surface. When you buy products, you need to screen and choose the effective products.
photocatalyst spray can be used in the outer layer of formaldehyde removal spray, which has dual formaldehyde removal effect.
5 There is no doubt that ventilation is the best way to reduce indoor formaldehyde concentration. Outdoor fresh air does not contain formaldehyde. It can be used for free. If it is introduced into the room, the formaldehyde concentration in the air can be reduced immediately. The larger the amount of air introduced, the lower the formaldehyde concentration.
ventilation faces two problems, dust and temperature regulation. In today’s big cities, the concentration of PM2.5 and dust of other diameters that threaten human health is quite high. Opening windows means that the concentration of indoor dust is the same as that of outdoor dust. Although it does not cause terrible pneumoconiosis, it is also a health threat. My family only opens a small slit in the window for ventilation, and PM2.5 often reaches the reading of 70mg / m3 or more. In the cold winter and midsummer, the harm of opening the window is too obvious, cold and high temperature will make people restless.
is a further formaldehyde removal solution by introducing outdoor fresh air through ventilation equipment with dust filter. FFU has the highest sex price, but it lacks the function of temperature regulation. Finally, the scheme of installing fresh air system comes to the surface and becomes the best solution of this answer. The fresh air system can keep the indoor air fresh, isolate dust, keep the room temperature at a comfortable value, and because the windows can be closed for a long time, it can also block all kinds of outdoor noise.
before decoration, please remember to give yourself a chance to install the fresh air system.