1, green plants
Green plants, such as green radish and chlorophytum, usually say that leaves can adsorb toxic gas molecules such as formaldehyde in the air and purify the air. The specific principle has not been scientifically analyzed, and it is taken seriously for the time being, because it does not hinder the final conclusion. There is no strong evidence as to whether formaldehyde is decomposed and absorbed after adsorption.
The leaves of green plants are not big, so more leaves are needed to absorb more formaldehyde and form a larger contact area. Moreover, the efficiency of formaldehyde adsorption by leaves is also a problem. Photosynthesis is the main treatment process in green plants, and adsorption of formaldehyde and other molecules is not the main function of plants, which means that plants have not done much work for it.
On the other hand, our house is not suitable for many green plants. There are no people hanging around the house, and they are full of green radish and chlorophytum. Even primitive people wouldn't do that. The function of a house is to live, not a garden, which determines that indoor green plants can only have a little adsorption surface and can only absorb very little formaldehyde.
Don't forget, even the most beautiful green plants have side effects, which will breed insects and bacteria and release carbon dioxide without light. The more green plants there are indoors, the more by-products will be accumulated, which will increase indoor pollution, which is also a reason why it is not suitable to place a large number of green plants indoors.
Therefore, it is unrealistic to hope to use green plants to come to in addition to formaldehyde. We still regard green plants as an ornament of interior decoration, which is more in line with actual needs. I only put a 1 meter long green radish on the TV cabinet in the living room. The green rattan extends on the white cabinet, and the curly branches stretch the green and full leaves, which is very beautiful.
2. Activated carbon
Activated carbon, diatom mud, Maya blue, etc. It can adsorb molecules in the air, and more importantly, it has a rich microporous structure, which is equivalent to expanding the contact area between the interior and the air, so it has strong adsorption capacity. Pay attention to the contact between the surface of activated carbon and air. It is useless to put a cloth bag filled with carbon indoors. Activated carbon can adsorb many molecules at the same time, and the adsorption efficiency of different molecules is different, among which the adsorption efficiency of formaldehyde is not high.
In terms of adsorption capacity, activated carbon substances are higher than green plants, and green plants are the worst method in this answer.
Activated carbon substances, if arranged in a large area indoors, have some small effects, but I don't recommend it. Because their role is considered together with the following factors, we will feel that the cost performance is very low.
Activated carbon substances are physically adsorbed, and the adsorbed molecules will be saturated without removal, and new molecules cannot be adsorbed. If it is not cleaned, a large number of toxic gas molecules will accumulate in activated carbon, which will not only be adsorbed, but will become a source of pollution. Using this substance, the method of regular cleaning is to expose to the sun and ventilate to discharge the molecules adsorbed inside, but how many properties are restored after reduction should be discounted. If the requirements are high, you can replace them with new ones regularly.
To sum up, activated carbon materials also need to be arranged in a large area to effectively adsorb formaldehyde. It is obviously not feasible to spread activated carbon and Maya blue in a room. If the paint is brushed on the wall, like diatom mud, how to clean up the absorbed things regularly becomes a problem. In the face of the continuous release of formaldehyde, activated carbon substances need to be cleaned up in a short time, otherwise the adsorption will be greatly reduced or even ineffective, which will bring great workload to users.
Some air purifiers claim to be in addition to formaldehyde, but they are actually activated carbon filters, and the situation is similar to this one. Generally speaking, activated carbon material is not cost-effective.
3, in addition to formaldehyde spray.
Green plants and activated carbon are aimed at free formaldehyde in the air, while in addition to formaldehyde spray is aimed at formaldehyde in furniture and ornaments. In addition to formaldehyde spray is a general term, including sealing agent and trapping agent, most of which can be sprayed on the surface of articles or smeared on the surface of articles with a brush. Spray a layer of medicine on the surface of the plate and let it penetrate under the surface of the plate, which can play a role for a long time and avoid being wiped off. Photocatalysts are also sprays, but because of their different working principles, they fall into the next category.
Blocking agent, as its name implies, is formaldehyde. Sealant is a stopgap measure, formaldehyde is still in it, but it is blocked by the sealing layer, and its release becomes slow.
Catching 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, it will consume the capture agent, and it will have no effect after consumption. This is a synchronous decay process, the capture agent is reduced in the reaction, and formaldehyde is also reduced in the reaction.
Back to our original purpose, it is to reduce the indoor formaldehyde concentration to a safe level. Both methods can reduce formaldehyde emission, which is a feasible scheme. A building can be used for several years without side effects. Most indoor air treatment companies in the market use the combination of these two methods and photocatalyst method. Personal purchase construction, pay attention to drugs may make the furniture surface discolored, it is best to try it out in a small scale before construction.
4. Photocatalyst
Photocatalyst is a high-tech product, which has a cold temperament from its name. Photocatalysts are oxides, such as titanium dioxide and WO3, which act as catalysts to oxidize and decompose formaldehyde into H2O and carbon dioxide under illumination. The light energy consumed in the decomposition process is easily available in our environment, even free of charge. I like the spray on it and recommend it.
Other products have bad side effects, and 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 it can also decompose and destroy the cell membrane of bacteria, which is equivalent to sterilization.
Seeing the outstanding function of the photocatalyst introduced above, it is estimated that the little whites are already in love and ready to enter the house. In fact, all photocatalyst businesses have long regarded these as advertising slogans and posted them in the windows of a treasure, a cat, an east and a shopping mall. I'm not like them, but I told you to put your wallet back first and do it after 2 o'clock:
A, photocatalyst to produce catalytic effect, there are requirements for light. Some photocatalysts need to be excited under ultraviolet light, but usually they need ultraviolet light to get ultraviolet light, or the sunlight comes in directly, and there is no glass in the middle, which is obviously not suitable for home. The other part of photocatalyst can be excited under visible light, but it needs light intensity, and it will not work if the intensity is lower than a certain value. Photocatalysts that can still play a role in general indoor lighting under weak light conditions are rare.
B. Photocatalysts have high requirements for the processing of nano-materials. There is no need to flush ordinary nano-titanium powder into the solution and coat it on the surface of the plate. When you buy products, you need to identify and choose useful products.
Photocatalyst spray can be used in the outer layer of in addition to formaldehyde spray, which has double in addition to formaldehyde effect.
5, ventilation class
There is no doubt that ventilation is the best way to reduce indoor formaldehyde concentration. Outdoor fresh air does not contain formaldehyde, which is inexhaustible and free of charge. When introduced indoors, the formaldehyde concentration in the air can be immediately reduced. 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 concentrations of PM2.5 and dust with other diameters that threaten human health are quite high. Opening a window means that the dust concentration indoors is the same as that outdoors. Although it will not cause terrible pneumoconiosis, it is also a health threat. At home, I only open a small window for ventilation, and the reading of PM2.5 often reaches more than 70mg/m3. In winter and summer, the disadvantages of opening windows are too obvious. Cold and high temperature can make people fidget.
Introducing outdoor fresh air through ventilation equipment with dust filter screen is a solution for further in addition to formaldehyde. The highest price is FFU, but it lacks the function of temperature adjustment. Finally, the scheme of installing fresh air system surfaced and became the best scheme of this answer. The fresh air system keeps the indoor air fresh, isolates dust, keeps the room temperature at a comfortable value, and can block all kinds of outdoor noises because the windows can be closed for a long time.
Before decorating, please remember to give yourself a chance to install fresh air system.