Method for preparing aminoglutaric acid modified expanded graphite and use in methyl aldehyde gas adsorption

A technology of expanded graphite and formaldehyde gas, which is applied in separation methods, chemical instruments and methods, and other chemical processes to achieve the effects of increasing surface activity, increasing adsorption capacity, and increasing pore volume.

Inactive Publication Date: 2009-05-27
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the first time, Chen Zhigang, Sun Lili and others modified expanded graphite with ammonia water as a modifier for the adsorption of formaldehyd

Method used

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  • Method for preparing aminoglutaric acid modified expanded graphite and use in methyl aldehyde gas adsorption
  • Method for preparing aminoglutaric acid modified expanded graphite and use in methyl aldehyde gas adsorption

Examples

Experimental program
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Example Embodiment

[0010] Example 1: A certain amount of expandable graphite prepared from natural flake graphite is soaked in a 0.1mol / L glutamic acid solution at a certain temperature, washed with water, dried, and expanded to obtain a modified expanded graphite. graphite. The mass ratio of expandable graphite to glutamic acid is 1:0.1, the immersion temperature is 40°C, and the immersion time is 1.5h. The obtained modified expanded graphite is subjected to a static adsorption test on formaldehyde gas at room temperature, and the maximum adsorption amount can reach 310 mg / g.

Example Embodiment

[0011] Embodiment 2: according to the preparation method described in embodiment 1, expanded graphite is soaked in the glutamic acid solution of 1.0mol / L, the mass ratio of expanded graphite and glutamic acid is changed into 1:0.3, soaking temperature is 40°C, soaking time is 1.5h. The prepared modified expanded graphite was subjected to a static adsorption test on formaldehyde gas at room temperature, and the maximum adsorption amount could reach 596mg / g.

Example Embodiment

[0012] Example 3: According to the preparation method described in Example 1, the mass ratio of expanded graphite and glutamic acid was changed to 1:0.4, the soaking temperature was 40°C, and the soaking time was 1.5h. The prepared modified expanded graphite was subjected to a static adsorption test on formaldehyde gas at room temperature, and the maximum adsorption amount could reach 532 mg / g.

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Abstract

The invention relates to the fields of preparing modified expansion graphite and applications thereof, in particular to a preparation method for glutamic acid modified expansion graphite. The invention is characterized in that: a fixed amount of expandable graphite prepared by taking natural crystalline flake graphite as a material is dipped into glutamic acid solution with a certain concentration, the expandable graphite is bathed, dried and puffed to prepare the modified expansion graphite; wherein, the weight ratio of the expandable graphite to the glutamic acid is 1: 0.1 to 1 : 0.4; the dipping temperature is 40 DEG C and the dipping time is 1.5h; the modified expansion graphite is applied to absorb indoor formaldehyde gas. After the expandable graphite is modified by the glutamic acid, the surface active site of the expandable graphite is increased; abundant functional groups are loaded; meanwhile the millipore wall of the expansion expandable graphite is eroded and collapsed; the increase of the large and middle holes of a submicron structure and the etching effect of modifier solution to the surface of the millipore enhance the absorption capacity of the expandable graphite to formaldehyde; the expandable graphite can be used for purifying indoor air.

Description

technical field [0001] The invention relates to the preparation and application field of glutamic acid modified expanded graphite, in particular to a preparation method of modified expanded graphite and its use in formaldehyde gas treatment. Background technique [0002] Expanded graphite is widely used in food, medicine, electric power, chemical industry, metallurgy, machinery, environmental protection and other fields as high conductive material, heating material, sealing material, adsorption material, catalyst, etc. Formaldehyde (formaldehyde) is a kind of prototoxic substance, the impact on human health is mainly to stimulate the eyes and respiratory tract mucous membranes, produce allergic reactions, abnormal immune function, cause liver and lung damage, affect the central nervous system, and also damage intracellular genetic material. The release period of indoor formaldehyde is 3 to 15 years. Formaldehyde is still widely used in various building decoration materials ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/04A61L9/014
Inventor 赵晓兵陈志刚付猛王荣飞
Owner JIANGSU POLYTECHNIC UNIVERSITY
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