Moving into a newly renovated home is a great event in life, but the “decoration of formaldehyde pollution†is everywhere. How to do it? Various tricks: buy a few large bags of bamboo charcoal in the house, it is said that this thing can not only absorb the odor, but also special effects on the invisible formaldehyde; plant a few pots of green plants in the house, especially the spider plant, the ability to absorb formaldehyde Call a strong one. Bamboo charcoal, green plants? Is it effective to remove formaldehyde by them?
Bamboo charcoal Vs. Formaldehyde: adsorption is not absorption
Some advertisements claim that bamboo charcoal has a strong adsorption capacity for formaldehyde and claims to have experimental evidence. However, these experimental conditions can not be undoubted, they put bamboo charcoal in near-saturated formaldehyde vapor, the amount of formaldehyde adsorption per gram of bamboo charcoal up to 68 mg is measured in this state, such an environment, just throw in a piece Wood can also be smoked into formaldehyde. The key question is whether bamboo charcoal can lock up these formaldehydes, and the results are disappointing. Once these bamboo charcoal saturated with formaldehyde is placed in an empty room without formaldehyde pollution, the formaldehyde will be released quickly. The formaldehyde content per gram of bamboo charcoal will drop to 34 mg within 3 hours, and will drop to 1.6 after one day. Mg - Decontamination products suddenly become a source of pollution.
The so-called bamboo charcoal adsorption capacity is mainly due to the fact that this amorphous carbon (different from the crystalline carbon of diamonds, although the chemical composition is the same) has many microporous structures calculated in microns. Just like water can seep in the sand. Formaldehyde, water, these ingredients can penetrate into the pores of bamboo charcoal. However, as the experiment shows, in addition to containing formaldehyde in the pores, bamboo charcoal has no special mechanism to limit their freedom, just as water can evaporate from the sand, and formaldehyde can also be volatilized from bamboo charcoal.
Even researchers who have done experiments on bamboo charcoal adsorption have pointed out that the adsorption of formaldehyde on formaldehyde is not stable, and it is not as close as the combination with water molecules. If the indoor air humidity is high, the adsorbed water molecules will be more than formaldehyde, and even the formaldehyde previously adsorbed on the bamboo charcoal may be squeezed out. Of course, if you add some substances that can react with formaldehyde in the pores of bamboo charcoal, it will be better to eliminate formaldehyde. However, such products have not yet appeared.
Many advertisements intentionally cover up these problems, and generally claim that activated carbon materials such as bamboo charcoal have special "adsorption efficiency", and more are taken out of context and sloppy. In actual use, the environmental conditions are changeable, there is no way to determine whether bamboo charcoal has no formaldehyde adsorption, and it is not known whether the indoor formaldehyde content is reduced.
In addition to bamboo charcoal, it is often heard to treat formaldehyde with green plants. Is the plant effective in addition to formaldehyde?
Plant Vs. Formaldehyde: We don't like formaldehyde either.
First of all, we have to make sure that formaldehyde is not a good thing for plants. This chemical also reacts with plant proteins, nucleic acids and lipids to damage plant cells. Plants that are sensitive to formaldehyde gas reactions, such as bougainvillea (somewhere also called bougainvillea), safflower sorrel, and rice cultivar, can also be injured in a high formaldehyde concentration environment, and even die. Safflower sorrel is particularly sensitive, as long as it is thrown in an environment with a formaldehyde concentration of 0.1 mg/m3, and after 3 hours, 95% of the leaves will be injured (calculated by area ratio). Moreover, when the concentration of formaldehyde increases, the rate of injury is faster. They can only persist for 3 hours in an environment with a formaldehyde concentration of 0.4 mg/m3. Then, the whole blade turns yellowish brown and loses water and becomes wilted. Withered grass.
The main reason is that formaldehyde binds to superoxide dismutase in plant cells, inactivating these key proteins, further destroying the cell membrane structure and eventually tearing down the wall. That is a critical part of the strict control of nutrients, moisture and waste in and out. At this point, the fate of plants can be imagined.
Absorption of formaldehyde is the defense mechanism of plants
Of course, some plants have a stronger tolerance to formaldehyde and even detoxification. Then, these plants are regarded as the gods of pollution.
The reality is that there are some “pipelines†in the plants that are used to scavenge formaldehyde, which reacts with specific chemicals to produce amino acids (such as serine), or directly into carbonic acid and carbon dioxide, thereby entering the material cycle. Used to make new sugar, fat or protein. On the surface, this process reduces the damage of formaldehyde to plant cells on the one hand, and increases the “nutrient†of plants on the other hand. After all, there is no difference between the carbon from formaldehyde and the carbon from carbon dioxide. It is a good way to do both.
However, it should be noted that this is only a plant defense response. To put it bluntly, dealing with formaldehyde is just a last resort. To carry out harmless treatment, it is also necessary to take a lot of circles, far less effective than absorbing carbon dioxide.
Can absorb, but not force
Since these plants have the ability to absorb formaldehyde, is it safe to use them to purify formaldehyde in the home?
The researchers measured the ability of some common indoor potted ornamental plants to treat formaldehyde by simulating a room containing formaldehyde. From the experimental results of the absorption efficiency, the ability of plants to treat formaldehyde is not enough to significantly reduce the formaldehyde concentration in the general living room in a short time. For example, the current average speed of treatment of formaldehyde by the spider plant, which is widely respected, is that the 1 m square blade handles 0.15 mg of formaldehyde per hour. In fact, usually the leaf area of ​​a plant of spider plant is less than 0.1 square meter. In other words, the total amount of formaldehyde that can be treated in a day is only 0.36 mg. If 100 square meters, the height of 3 meters in the living room, the concentration of formaldehyde is 0.5 mg / cubic meter, a total of 150 mg of formaldehyde, to be reduced to a safe standard (0.1 mg / cubic meter) requires at least 120 mg of formaldehyde. That crane will work hard for 333 days. Of course, this is not a new volatilization of formaldehyde from decorative materials.
Other plants that have the ability to absorb formaldehyde, some have a slightly higher absorption rate than the spider orchid, and some have a slightly larger leaf area, but they will not bring about significant improvement, and the actual treatment effect is still quite limited. In addition, the data from the absorption experiments were taken in a relatively small space. In other words, formaldehyde can't be floated in space, and it must be surrounded by plants to be effectively removed. In terms of image, the plant is not a vacuum cleaner, but a fisherman who is hooked.
Bamboo charcoal and green plants are not good enough, so what can we do? In the experiment on the effect of ventilation on formaldehyde concentration, after 3 months of forced ventilation in the room, the indoor formaldehyde concentration will drop from the initial 0.248 mg/m3 to 0.071 mg/m3, a drop of 75%. It seems that window ventilation is the most convenient and effective means of removing formaldehyde.
The method is partially feasible, but the effect is not good.
The activated carbon material represented by bamboo charcoal is not absorbed by formaldehyde, and the weakness of this adsorption makes the formaldehyde may be released, and the effect is difficult to ensure. Although plants such as spider plant have a certain ability to absorb formaldehyde, the amount of formaldehyde absorbed is very limited. It takes a long time to effectively reduce the formaldehyde content in the room. Although there is no harm in these two methods, don't expect too much from their effects. On the basis of selecting environmentally friendly and healthy decorative materials with low formaldehyde content, ensuring indoor ventilation is an effective way to reduce formaldehyde pollution. Still open the window and ventilate it!
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