Sihainet: for the house that has just been decorated, the first task is to remove formaldehyde. In recent years, people's health awareness has been greatly improved. The harm of formaldehyde naturally need not be said much, so how can we effectively remove formaldehyde? Let's take a look at it!
1. Green plants
Green plants such as Chloranthus, Chlorophytum, etc. usually say that the leaves can absorb toxic gas molecules in the air such as formaldehyde and play a role in purifying the air. The specific principle has not been scientifically analyzed, so take it seriously for the time being, because this does not hinder the final conclusion. As for the decomposition and absorption of formaldehyde after adsorption, there is no strong evidence.
The leaves of green plants are not big, so they need more leaves to absorb more formaldehyde and form larger contact area. In addition, the efficiency of formaldehyde adsorption by leaves is also a problem. The main processing flow of green plants is to produce organic compounds 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 for this. On the contrary, our house is not suitable for arranging a large number of green plants. No one hangs all over the house, full of green plants and Chlorophytum, even the primitive people will not. The function of the house is to live, not to 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. They breed insects and bacteria, and release carbon dioxide when there is no light. The more green plants in the room, the more by-products accumulated, and the greater indoor pollution. This is also a reason why a large number of green plants are not suitable for indoor placement.
Therefore, it is not practical to rely on the hope of using green plants to remove formaldehyde. We still better use green plants as decorations for interior decoration, which is more in line with the actual needs. I only put a one meter long green pineapple on the living room TV cabinet. The green vines extend on the white cabinet, and the curly branches stretch the full green leaves, which is very beautiful.
2. Activated carbon
Activated carbon, diatom mud, Mayan blue, etc. have adsorption effect on molecules in the air, more importantly, they have rich microporous structure, which is equivalent to expanding the contact area between the internal and the air, so they have strong adsorption capacity. Pay attention to contact the surface of activated carbon with the air. If you put a bag of carbon bags indoors, it will have no effect. 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, which is the least effective method in this study.
Activated carbon materials, if they are arranged in a large area indoors, have some small effects, but I don't recommend them. Because if we consider their functions together with the following factors, we will feel that the price performance ratio is very low.
Activated carbon is a kind of physical adsorption. If the adsorbed molecules are not cleaned up, they will accumulate and saturate, and cannot adsorb new molecules. If not cleaned up, a large number of toxic gas molecules are accumulated in the activated carbon materials, which will not play the role of adsorption, but will become a source of pollution. Using this kind of material, the method of regular cleaning is to expose it to the sun and ventilate it to discharge the adsorbed molecules. However, after reduction, how much performance can be recovered should be discounted. If the requirements are high, the new one can be replaced regularly.
To sum up, activated carbon materials also need large area layout to effectively absorb formaldehyde. If a room is spread out to place activated carbon and Mayan blue, it is obviously not feasible. If the paint is applied to the wall, like diatom mud, how to regularly clean up the internal adsorption becomes a problem. In the face of the continuous release of formaldehyde, the activated carbon materials need to clean up the adsorbed things in a short time, otherwise the adsorption will be greatly reduced or even invalid, which will bring a lot of work to users. Some air purifiers claim to be able to remove formaldehyde, which is actually the function of activated carbon filter screen, and the situation is similar to this item. In general, the cost performance of activated carbon is not high.
3. Formaldehyde removing sprays
Green plants and activated carbon are for free formaldehyde in the air, while formaldehyde removal spray is for formaldehyde in furniture and ornaments. Formaldehyde remover spray is a general term, including sealer and catcher, most of which can be sprayed on the surface of the article or applied on the surface of the article with a brush. Spray a layer of agent on the surface of the plate to make it penetrate into the shallow surface of the plate, 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.
Sealing agent, as the name implies, is to seal up formaldehyde. Sealer is not a cure, formaldehyde is still in it, but blocked by the sealing layer, the release becomes slow.
Capture agent can capture and decompose formaldehyde molecules. This is a real chemical reaction to remove formaldehyde, formaldehyde will be decomposed into water and ammonia substances, it is recommended. Since it is a chemical reaction, there is a consumption of the trapper, and it will not work after consumption. This is a process of simultaneous attenuation, in which the catcher is reduced in the reaction and formaldehyde is also reduced in the reaction.
Back to our original purpose is to reduce the indoor formaldehyde concentration to a safe level. Both of these two methods can reduce the formaldehyde emission, which is a feasible scheme. It can be used for several years at a time without any side effects. Most of the indoor air treatment companies in the market adopt the combination of these two methods and photocatalyst method. Personal purchase and construction, pay attention to the chemicals may make the surface of furniture discoloration, before construction, it is best to first small-scale trial to confirm.
Photocatalyst can be called a high-tech product, which has a high cold temperament in its name. Photocatalyst is TiO2, WO3 and other oxides, which act as catalyst under light, oxidize formaldehyde and other molecules into H2O and CO2. The light energy consumed in the decomposition process can be easily obtained in our environment, even free of charge. As with the above sprays, it is recommended.
Other products have bad side effects, while photocatalyst has good side effects. It can not only decompose toxic gas molecules such as formaldehyde, but also remove odor molecules, which is equivalent to deodorization, and can decompose and destroy bacterial cell membrane, which is equivalent to sterilization.
Seeing the outstanding function of photocatalyst introduced above, it is estimated that Xiaobai people are already in love and ready to enter the house. In fact, all photocatalyst businesses have long regarded these as advertising language and posted them in the window of a treasure, a cat, an East and a shopping mall. I'm different from them in that I tell you to put back the wallet you've pulled out, and then start after you see the following 2 points:
A. to make photocatalyst produce catalysis, light is required. Part of photocatalysts need to be excited under ultraviolet light, and usually ultraviolet light is needed to obtain ultraviolet light, or let the sun directly shine in, and the glass cannot be separated in the middle, which is obviously not suitable for home. The other part of photocatalyst can be excited under visible light, but it has requirements for light intensity, and the intensity lower than a certain value has no effect. Under the weak light condition of the general indoor light, the photocatalyst which can still produce effect is rare.
B. photocatalyst has a high technological requirement for nano materials, which does not work if ordinary nano titanium powder is washed into the solution and coated on the surface of the plate. When you buy a product, you need to identify and choose a product that works.
Photocatalyst spray can be used in the outer layer of formaldehyde removal spray, which has double formaldehyde removal effect.
There is no doubt that ventilation is the best way to reduce indoor formaldehyde concentration. The outdoor fresh air does not contain formaldehyde. It is free of charge and can reduce the formaldehyde concentration in the air immediately after being introduced into the room. The greater 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 other diameter dust is very high, opening windows means that the indoor and outdoor dust concentration is the same, although it will not cause terrible pneumoconiosis, but it is also a health threat. In my home, I only open a small slot in the window for ventilation, and PM2.5 often reaches a reading of more than 70mg / m3. In winter and summer, the disadvantages of opening windows are too obvious. Cold and high temperature can make people fidgety.
It is a further formaldehyde removal solution to introduce fresh air into the room through ventilation equipment with dust filter screen. FFU has the highest sexual price, but it lacks the function of regulating temperature. Finally, the scheme of installing the fresh air system emerges as the best solution of this answer. The fresh air system keeps the indoor air fresh, isolated from dust, and keeps the room temperature at a comfortable value. Moreover, because the windows can be closed for a long time, it can also block all kinds of outdoor noise.