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How to remove formaldehyde?

- Feb 27, 2018 -

Formaldehyde is a highly toxic substance and formaldehyde ranks second in the list of top priority toxic chemicals in China. Formaldehyde has been identified by the World Health Organization as carcinogenic and teratogenic substances, is recognized as a source of allergies, but also one of the potential potent mutagens.


Formaldehyde hazard

Long-term exposure to low doses of formaldehyde can cause chronic call of children and pregnant women are particularly sensitive to formaldehyde, the greater the hazard. According to relevant statistics, 70% of human illness is related to the indoor environment. In China, 120,000 people die of indoor pollution each year, and over 90% of young leukemia patients are admitted to newly renovated houses within one year.

Formaldehyde nemesis

A generic term that can absorb plants that are harmful to human health. These plants are: Chlorophytum, Hydrangea, Ivy, Aloe, Agave, Gerbera, Chrysanthemum, Green radish, Begonia, Commelina. Chlorophytum can absorb more than 80% of the indoor harmful gases, the ability to absorb formaldehyde super. Ivy can be powerful addition to formaldehyde, benzene. Decomposes two types of harmful substances, namely formaldehyde in carpeting, insulation, plywood, and xylene that is harmful to the kidneys hidden in the wallpaper.

 

Formaldehyde treatment

1, ventilation method

Ventilation method need not be too much explanation, that is, through the air flow, the harmful gases to the outside, this is a simple and effective method, the only downside is the formaldehyde release cycle is long, usually three years to fifteen years, after the renovation will New home idle more than three years is obviously unrealistic. Difficult to rely solely on ventilation method also failed to meet the requirements.

 

2, formaldehyde scavenger or nano addition of aldolase

Formaldehyde scavengers rely on chemical reactions to "get rid of" formaldehyde. The essence of this approach is to reduce the toxicity of the target substance or convert it to a non-toxic substance. Formaldehyde, which can be oxidized to formic acid, can also be reduced to methanol, both of which are less toxic and irritating than formaldehyde, but their toxicity is still present. For example, some strong oxidizing formaldehyde scavengers can oxidize formaldehyde, but it is easily decomposed. It is harmful to wood when it is sprayed on wooden boards, and it will not be effective within a few hours. Moreover, high concentration of scavenger sprayed in the air, will have a new pollution hazard. Other oxidants, reducing agents are also not effective in removing formaldehyde, and will introduce similar new pollution.

 

3, activated carbon adsorption

Li, an expert in activated carbon research at Nankai University, told reporters that the initial use of activated carbon does indeed have an effect. Because pores have adsorption potentials, they are formed by the gravitational attraction of carbon molecules and adsorbed molecules. The smaller the pore size, the stronger the adsorption potential. In addition, according to the theory of molecular motion, all objects are made up of molecules or atoms, with gaps between them, while at the same time they are in a state of endless thermal movement with frequent collisions between molecules. According to the relevant data, in the standard state, formaldehyde molecules freely move at a speed of about 450 m / s, and one formaldehyde molecule collides with other molecules 109 times per second. At this point, the collision molecule diameter and activated carbon pore if it is matched, that is adsorbed. Either traditional activated carbon, or more speculation modified activated carbon, due to its large pores, adsorption capacity is limited.


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