A kind of formaldehyde removal purification material and its preparation method and application
A formaldehyde purification and porous adsorption material technology, applied in the field of air purification, can solve the problems of many types of by-products, cannot be converted into carbon dioxide and water, and high cost of precious metal catalysts, achieve complete formaldehyde, increase the effective adsorption area, and reduce large and small particles. Effect of ineffective adsorption area of pores
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Embodiment 1
[0071]This embodiment provides a formaldehyde-removing purification material. The purification material uses transparent silicon oxide as a carrier, and the outer surface of the carrier and the inner surface of the hole are used as an inner layer. An ethyleneimine layer was used as the middle layer and an amide-type amino acid layer with a thickness of 0.5 nm was used as the outermost layer.
[0072] The preparation method of described purification material, comprises the following steps:
[0073] (1) Use the equal volume impregnation method to make the specific surface area 250m 2 / g transparent silica carrier, completely immersed in the polyethyleneimine solution, the molecular weight of the polyethyleneimine is 10000, the solution controls the mass ratio of polyethyleneimine to water to be 0.02:1, soaked for 2h, Take it out, and dry it at 80°C for 24 hours to obtain a carrier provided with a polyethyleneimine layer;
Embodiment 2
[0083] Compared with Example 1, the only difference is that glutamine in step (2) is replaced by asparagine.
[0084] The formaldehyde-removing purification material prepared in this example, in a 30-cubic closed experimental cabin, has a formaldehyde-removing CADR value of 132m measured by the phenol reagent method. 3 / h, the specific data are shown in Table 2.
[0085] Table 2
[0086] time / min 0 5 10 15 20 25 30 35 Formaldehyde concentration (mg / m 3 )
[0087] As can be seen from Table 2, the formaldehyde removal purification material passed in this embodiment, after 35 minutes, the formaldehyde concentration in the experimental cabin was changed from 1.158mg / m 3 Reduced to 0.099mg / m 3 , the removal rate of formaldehyde was 91.45%, which shows that the formaldehyde removal purification material provided in this embodiment has a good formaldehyde removal effect.
Embodiment 3
[0089] This embodiment provides a formaldehyde-removing purification material. The purification material uses white titanium oxide as a carrier, and the outer surface of the carrier and the inner surface of the hole are used as an inner layer. A polyethyleneimine layer was used as the middle layer and an amide-based amino acid layer with a thickness of 0.5 nm was used as the outermost layer.
[0090] The preparation method of described purification material, comprises the following steps:
[0091] (1) Use the equal volume impregnation method to make the specific surface area 200m 2 The white titanium oxide carrier of / g is completely immersed in the polyethyleneimine solution, and the molecular weight of the polyethyleneimine is 50000, and the mass ratio of polyethyleneimine and water is controlled by the solution to be 0.3:1, soaked for 5h, Take it out, and dry it at 110°C for 12 hours to obtain a carrier provided with a polyethyleneimine layer;
[0092] (2) Mix sodium carb...
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Abstract
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