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Preparation method of activated carbon adsorption material for removing medium and low-concentration formaldehyde

An activated carbon adsorption, low-concentration technology, applied in chemical instruments and methods, gas treatment, membrane technology, etc., can solve the problems of high cost, only in the laboratory, cumbersome operation of formaldehyde, etc., to achieve stable performance, simple raw materials, raw materials easy-to-get effect

Inactive Publication Date: 2016-12-07
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above equipment and technologies for purifying formaldehyde in indoor air generally have disadvantages such as cumbersome operation, high cost, or can only be carried out in laboratories.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Use walnut shells as raw materials, grind them in a mortar until the particle size is 0.2-0.4mm, clean them, soak them in a hydrochloric acid solution with a mass fraction of 50% for 12 hours, wash them with deionized water until they are neutral, and bake them at 60°C Dry, and then placed in a tubular muffle furnace and calcined at 700 °C for 4 h under the protection of nitrogen to prepare activated carbon for future use.

Embodiment 2

[0016] Wash the activated carbon prepared in Example 1 with deionized water and dry it for later use. Pour 70 mL of hydrogen peroxide solution with a mass fraction of 30% into a container containing 5 g of activated carbon, ultrasonically treat it for 30 minutes, and then immerse it in an air bath constant temperature oscillation. After 2 hours, the solution was removed by filtration, the filter cake was repeatedly washed with deionized water, and then dried in an oven at 60° C. to obtain the target activated carbon adsorption material. Take 1.5g of the activated carbon adsorption material and place it in a formaldehyde gas concentration of 0.8-1.0mg / m 3 In the airtight experimental cabin, the penetration time of the activated carbon adsorption material for formaldehyde gas was determined to be 3.5 hours, and the adsorption rate of formaldehyde gas was 54.5%.

Embodiment 3

[0018] The gac prepared in Example 1 was washed with deionized water and dried for later use, and 70 mL of sodium hydroxide solution with a molar concentration of 0.05 mol / L was poured into a container containing 5 g of gac, ultrasonically treated for 30 min, and then placed in an air bath Immerse in constant temperature shaking for 2 hours, remove the solution by filtration, wash the filter cake repeatedly with deionized water, and then place it in an oven at 60°C to dry to obtain the target activated carbon adsorption material. Take 1.5g of the activated carbon adsorption material and place it in a formaldehyde gas concentration of 0.8-1.0mg / m 3 In the airtight experimental cabin, the penetration time of the activated carbon for formaldehyde gas was determined to be 7.8 hours, and the adsorption rate of formaldehyde gas was 67.5%.

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Abstract

The invention discloses a preparation method of an activated carbon adsorption material for removing medium and low-concentration formaldehyde, and belongs to the technical field of preparation of activated carbon adsorption materials. The key point of the technical scheme provided by the invention is that the preparation method comprises the following steps: by using walnut shells as a raw material, sequentially performing grinding, acid pickling, water washing and carbonization; sequentially performing washing, drying, modifying, ultrasonic combination, soaking, washing and drying on prepared activated carbon, thus obtaining the activated carbon adsorption material for removing the medium and low-concentration formaldehyde. The activated carbon adsorption material prepared by the preparation method disclosed by the invention is stable in performance, and is suitable for removing the low-concentration formaldehyde in a room; in addition, the raw material is simple and easy to obtain, and a treatment process is simple; the activated carbon adsorption material is suitable at home; when the concentration of formaldehyde gas is 0.8 to 1.0mg / m<3>, the adsorption rate of the prepared activated carbon adsorption material to the formaldehyde gas reaches 60 to 70 percent.

Description

technical field [0001] The invention belongs to the technical field of preparation of formaldehyde adsorption materials, and in particular relates to a preparation method of activated carbon adsorption materials used for removing medium and low concentration formaldehyde. Background technique [0002] Formaldehyde is a colorless gas with a strong pungent odor, easily soluble in water, alcohol and ether, and is gaseous at room temperature. The chemical properties of formaldehyde are very active, and it is a strong reducing agent. It has strong reducing property, strong irritation and is volatile. It is a prototoxic substance of cells. It directly generates methyl derivatives under the action of amino groups and hydroxyl groups, and then destroys body proteins and enzymes, causing irreversible coagulation and necrosis of tissue cells. The International Agency for Research on Cancer (IARC) classified formaldehyde as a human carcinogen (Group I) in 2004. At present, there are ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01J20/20B01D53/02B01D2257/70B01D2259/4508B01J2220/4825
Inventor 金彩霞张慧娜吴亚琼屈婧祎张银迪陈玉萍张霞刘洪梅王子英张琴文
Owner HENAN NORMAL UNIV
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