Formaldehyde adsorbent and preparation method thereof

Abstract

The invention provides a formaldehyde adsorbent. The adsorbent comprises a carrier and an active agent, the carrier is halloysite, and the active agent is 4-aminobenzene-1,2-diol. The invention further provides a preparation method of the formaldehyde adsorbent. The provided formaldehyde adsorbent comprehensively utilizes the physical adsorption effect of halloysite and the chemical reaction effect of the active agent, the preparation method is simple and easy to implement, the raw materials are cheap and easy to obtain, the formaldehyde adsorption performance is good under normal temperatureconditions, and the filtering efficiency can reach 98%; compared with the adsorption capacity of existing commercial formaldehyde adsorbing activated carbon, the adsorption capacity of the formaldehyde adsorbent is 1.5 times or above that of the commercial formaldehyde adsorbing activated carbon, and the formaldehyde adsorbent has the excellent formaldehyde adsorption performance.

Description

technical field [0001] The invention belongs to the technical field of indoor air pollution control, and in particular relates to a formaldehyde adsorbent and a preparation method thereof. Background technique [0002] The harm of indoor formaldehyde to the human body has been known to the public. It is one of the main pollutants of indoor air pollution. It has the characteristics of high toxicity, wide sources and long release time. Abnormal, abnormal immune function, stimulating the central nervous system, affecting and damaging the genetic material in cells, has been identified as carcinogenic and teratogenic substances by the World Health Organization, my country's "Indoor Air Quality Standard GB / T18883-2002" stipulates that formaldehyde in indoor air Concentration should not exceed 0.10mg / m 3 . Existing formaldehyde treatment technologies mainly include physical adsorption, chemical reaction and photocatalysis. The physical adsorption method has disadvantages such as a...

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Problems solved by technology

[0003] CN105148856A discloses an air purification material capable of removing formaldehyde, acetaldehyde, acetic acid and ammonia and a preparation method thereof. In the invention, the air purification material carrier is subjected to acidification treatment, washed and dried to obtain an acidified air purification material carrier, and water, Hydroxylamine chloride, hexamethylenetetramine, chitosan and orotic acid are miscible according to the mass ratio to prepare a miscible solution, the acidified air purification material carrier is immersed in the miscible solution for reaction, and dried after the reaction. That is, the air purification material is obtained. The air purification material provided by the invention has a good formaldehyde adsorption effect, especially for low-concentration formaldehyde, and still has a good removal effect. In addition, it also has a good removal effect for acetaldehyde, acetic acid and ammonia. However, the preparation of the purification material requires the use of 4 kinds of reagents, and strong acids such as hydrochloric acid, sulfuric acid and nitric acid may be used. The preparation process has certain risks and is prone to environmental pollution.

CN101862638A discloses a formaldehyde adsorbent and a preparation method. First prepare a hydrogen peroxide solution, then add the hydrogen peroxide solution into a container filled with granular halloysite, stir and impregnate; filter the impregnated halloysite , after drying and drying, a formaldehyde adsorbent with a loose appearance, full expansion, further subdivided pore size, highly developed structure and enlarged specific surface area is obtained. The essence of the invention is to make the existing Halloysite is more fluffy and has a larger specific surface area, thereby improving the adsorption capacity of halloysite, but the adsorption capacity of halloysite itself is always limited

CN101327424 discloses a formaldehyde adsorbent containing chitosan, which is characterized in that the powder formaldehyde adsorbent is prepared by uniformly mixing chitosan, manganese dioxide and halloysite, and can also be added with citric acid, mixed with water and then extruded Manganese dioxide is adhered in the drum, rolled evenly and then dried to obtain granular formaldehyde adsorbent. Through the adsorption of formaldehyde adsorbent containing chitosan in this invention, the content of formaldehyde gas in the space can be greatly reduced, and the cost is low. It is easy to use and popularize, and powder and granules can be selected according to needs. However, the role and mechanism of manganese dioxide in this invention are unknown