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Preparation method and application of modified activated carbon with ultrahigh formaldehyde adsorption capacity

A formaldehyde adsorption and activated carbon technology, applied in the field of materials, can solve the problems of high cost of silver ion catalysts, and achieve the effects of facilitating large-scale production, increasing the reaction rate and limit, and making materials easy to obtain

Pending Publication Date: 2022-05-13
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This direction works very well, but because silver ions are heavy metals, especially a small amount of free silver ions in the air is okay, once a certain safety limit is exceeded, it will cause serious consequences
At the same time, the cost of this silver ion catalyst is high. Judging from the current commodity prices, the cost of treating a room of 60 square meters is no less than 300 yuan, and it cannot be removed at one time.

Method used

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  • Preparation method and application of modified activated carbon with ultrahigh formaldehyde adsorption capacity
  • Preparation method and application of modified activated carbon with ultrahigh formaldehyde adsorption capacity
  • Preparation method and application of modified activated carbon with ultrahigh formaldehyde adsorption capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 preparation

[0032] (1) Preparation of modified activated carbon with ultra-high formaldehyde adsorption capacity

[0033] 1) Dissolve 2.5 g of polyethyleneimine with a relative molecular mass of 600 and 0.5 g of urea crystals in 50 mL of distilled water, stir for 0.5 h, and mix well to obtain a mixed solution A;

[0034] 2) Heating the mixed solution A obtained in step 1) at 50° C. while stirring for 2 hours, and stirring evenly to obtain the mixed solution B;

[0035] 3) Wrap activated carbon in aluminum foil, put it into a muffle furnace and heat at 400°C for 8 hours;

[0036] 4) Add the activated carbon obtained in step 3) to the mixed solution B obtained in step 2), and continue stirring for 3d to obtain mixed solution C;

[0037] 5) Filter the solution obtained in step 4), and dry in an oven at 180° C. for 12 hours in an air environment to obtain modified activated carbon.

[0038] (2) Preparation of activated carbon with polyethyleneimine attache...

Embodiment 2

[0044] Example 2 application

[0045] 1) Roll 5 layers of medical degreasing gauze (length 17cm, width 5cm) on a glass rod (glass rod specification: length 30cm, diameter 5mm), and fix it with cotton thread;

[0046] 2) Take 0.2mL of formaldehyde solution with a mass fraction of 0.2%, drop it on the gauze wrapped on the glass rod, and immediately put it into a volume of 1.6m 3 In the air chamber, turn on the electric fan in the air chamber, weigh 5g of the modified activated carbon prepared in Example 1 (1), spread it evenly in a circular petri dish, put it in the air chamber, and use it before and after 18h. Formaldehyde spectrophotometry was used to measure the concentration change of formaldehyde in the two air chambers.

[0047] 3) Weigh 5g of activated carbon and the activated carbon with only polyethyleneimine attached and the activated carbon with urea attached only prepared in Example 1, and carry out the application experiment according to the steps 1)-2) of Example ...

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Abstract

The invention relates to a preparation method and application of modified activated carbon with ultrahigh formaldehyde adsorption capacity, and belongs to the technical field of materials. The preparation method comprises the following steps: dissolving polyethyleneimine and urea crystals in water to obtain a clear solution, continuously heating and stirring to obtain a mixed solution, adding activated carbon calcined in a muffle furnace into the mixed solution, stirring, filtering and drying to obtain the modified activated carbon. The modified activated carbon prepared by the invention not only can promote the forward proceeding of the formaldehyde adsorption reaction of the activated carbon and shorten the adsorption reaction time, but also can obviously reduce the decomposition phenomenon of the reaction product and avoid the release of formaldehyde gas, and has the advantages of low cost, simplicity in operation, environmental protection, cost saving, strong formaldehyde adsorption capacity and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method and application of a modified activated carbon with ultra-high formaldehyde adsorption capacity. Background technique [0002] Indoor air purification is crucial to human health, as people currently spend more than 80% of their time at home, in the office, and in their cars. Volatile organic compounds are among the most common indoor air pollutants. Formaldehyde (HCHO) in organic compounds is widely derived from interior decoration materials such as paint, wood-based panels, laminate flooring, and furniture, and is considered to be the chief culprit of indoor air pollution. High concentrations of formaldehyde have profound effects on the nervous system, respiratory system and immune system of the human body. Long-term exposure to indoor air containing formaldehyde, even within an hour, can have adverse effects on human health [0003] Activat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01D53/02B01D53/72B01D53/81
CPCB01J20/20B01J20/22B01J20/262B01D53/02B01D53/72B01D53/81
Inventor 刘田泽姜海燕张治国范晓星许超张美霞徐晓娟陶然
Owner LIAONING UNIVERSITY
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