1. Ventilation method

Ventilation method in addition to formaldehyde doesn't need to explain too much. It is a simple and effective method to discharge formaldehyde to the outside through window ventilation. The disadvantage is that the formaldehyde release cycle is long, usually three to fifteen years. It is obviously unrealistic to leave the new house idle for more than three years after renovation. Because of this, ventilation alone can not meet the requirements.

2. Formaldehyde scavenger method

Formaldehyde scavenger "removes" formaldehyde by chemical reaction. The essence of this method is to remove formaldehyde from the target substance through redox reaction.

3. Activated carbon adsorption method

Activated carbon does have an effect at the initial stage of use, because the pores have adsorption potential, which is formed by the attraction between carbon molecules and adsorbed molecules. The smaller the pore size, the stronger the adsorption potential.

According to the relevant data, in the standard state, the free movement speed of formaldehyde molecule is about 451m/s, and one formaldehyde molecule collides with other molecules for 119 times per second.

at this time, if the diameter of the collision molecule matches the pore of the activated carbon, it will be adsorbed. Whether it is traditional activated carbon or modified activated carbon which is fried more, its adsorption capacity is limited because of its too large pores.

The maximum temperature of sunlight is only about 51 degrees Celsius, and only water can be evaporated. The pollutants adsorbed in activated carbon can not be completely volatilized, and the adsorption function of carbon can not be completely restored. Therefore, exposure is more about removing water from activated carbon. The adsorption performance cannot be recovered.

Generally, activated carbon has a certain adsorption effect on benzene, but the adsorption effect on formaldehyde is not obvious. Generally, the adsorption capacity of activated carbon will become weak after one month.

4. Water adsorption method

Many people on the Internet said that because formaldehyde is soluble in water, you can put more basins at home to absorb formaldehyde, or soak it in vinegar or black tea.

It is a fact that formaldehyde is easily soluble in water, water, alcohol and ether. Free formaldehyde in the air will dissolve into it when it meets water during its movement, which is similar to the adsorption principle of activated carbon.

The contact area between a basin of water and air is only the size of a basin, while the specific surface area of the internal pores of 1 g of activated carbon can reach the size of a football field.

even if you put a hundred pots of water in the room, the adsorption effect will not be much stronger than that of a small bag of activated carbon. Therefore, it is obviously unrealistic to use water, black tea and vinegar to adsorb formaldehyde.

The release of formaldehyde is closely related to indoor temperature and temperature. With the increase of humidity in the air, the release of formaldehyde will greatly increase. The experimental results show that when the relative temperature in the air increases by 11%, the indoor formaldehyde emission will increase by about 5%.

5. Plants absorb formaldehyde

The principle that plants absorb formaldehyde is through photosynthesis, but the effect of such methods is extremely limited. The reasons are as follows: plants are engaged in photosynthesis, and generally inhale some harmful substances during the day, but they do not have this function at night. The harmful substances absorbed by plants are extremely limited.

The national standard requires the formaldehyde release value to be less than 1.18mg/m3, and the formaldehyde in most newly renovated houses is not less than 1.2mg/m3, while the green radish with high formaldehyde absorption efficiency absorbs only 21mg of formaldehyde per hour.

Therefore, plants can only play an auxiliary role in controlling harmful substances such as formaldehyde and benzene.

6. Photocatalyst method

Under the irradiation of light, photocatalyst will produce a photocatalytic reaction similar to photosynthesis, producing free hydroxyl groups and active oxygen with strong oxidation ability, which has a strong redox function, can oxidize and decompose various organic compounds and some inorganic substances, can destroy the cell membrane of bacteria and solidify the protein of viruses, and can kill bacteria and decompose organic pollutants. It decomposes organic pollutants into pollution-free water (H2O), carbon dioxide (CO2) and other harmless substances, so it has strong functions of sterilization, deodorization, mildew prevention, self-cleaning and air purification, and it is a top quality in addition to formaldehyde product.