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Method for preparing CTAB modified expanded graphite and use in absorbing formaldehyde gas

A technology of expanded graphite and modification, which is applied in the field of preparation of CTAB modified expanded graphite to achieve the effects of increasing surface activity, improving adsorption capacity and increasing activity

Inactive Publication Date: 2009-05-20
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 used ammonia as a modifier to modify expanded graphite and used it for the adsorption of formaldehyde gas. However, CTAB was used as a modifier to modify expanded graphite and applied to the treatment of formaldehyde gas. see the report

Method used

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  • Method for preparing CTAB modified expanded graphite and use in absorbing formaldehyde gas
  • Method for preparing CTAB modified expanded graphite and use in absorbing formaldehyde gas
  • Method for preparing CTAB modified expanded graphite and use in absorbing formaldehyde gas

Examples

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Effect test

Embodiment 1

[0011] Example 1: A certain amount of expandable graphite prepared from natural flake graphite is immersed in a 0.01 mol / L CTAB solution at a certain temperature, washed with water, dried, and expanded to obtain modified expanded graphite. The ratio of expandable graphite and CTAB is 1:0.1, the immersion temperature is 40℃, and the immersion time is 1h. The prepared modified expanded graphite is subjected to a static adsorption test for formaldehyde gas at room temperature, and the maximum adsorption capacity can reach 270 mg / g.

Embodiment 2

[0012] Example 2: A certain amount of expandable graphite prepared from natural flake graphite is immersed in a 0.04 mol / L CTAB solution at a certain temperature, washed, dried, and expanded to obtain modified expanded graphite. The ratio of expandable graphite and CTAB is 1:0.1, the immersion temperature is 70°C, and the immersion time is 1.5h. The prepared modified expanded graphite is subjected to a static adsorption test for formaldehyde gas at room temperature, and the maximum adsorption capacity can reach 1200 mg / g.

Embodiment 3

[0013] Example 3: A certain amount of expandable graphite prepared from natural flake graphite is immersed in a 0.02 mol / L CTAB solution at a certain temperature, washed with water, dried, and expanded to obtain modified expanded graphite. The ratio of expandable graphite and CTAB is 1:0.1, the immersion temperature is 60℃, and the immersion time is 1.5h. The prepared modified expanded graphite is subjected to a static adsorption test for formaldehyde gas at room temperature, and the maximum adsorption capacity can reach 610 mg / g.

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Abstract

The invention relates to preparation of modified expansion graphite and application field thereof, in particular to a method for preparing CTAB modified expansion graphite. The method is characterized in that certain amount of expandable graphite prepared by taking natural flake graphite as a raw material is soaked in a CTAB solution with a concentration of between 0.01 and 0.5mol / L at certain temperature, and the modified expansion graphite is obtained through washing, drying and swelling, wherein the proportion of the expandable graphite to CTAB is 1: 0.1-1: 1, the soaking temperature is between 40 and 100 DEG C, the soaking time is 1 to 8 hours, and the CTAB modified expansion graphite is applied to the absorption to formaldehyde gas indoors. The expansion graphite modified by the CTAB increases surface active sites, and the surface is loaded with rich functional groups, so the modified expansion graphite can perform static and dynamic absorption on formaldehyde to purify the indoor air when the modified expansion graphite is used for the treatment of the formaldehyde gas.

Description

Technical field [0001] The invention relates to the preparation of CTAB modified expanded graphite and its application field, in particular to the preparation method of CTAB modified expanded graphite and its application in formaldehyde gas treatment. Background technique [0002] Expanded graphite is a cheap and extremely versatile material, which is widely used in the fields of sealing, electrical conductivity, adsorption, flame retardant, catalysis and medical materials, especially in the treatment of waste liquid, waste gas and oily wastewater. Formaldehyde is a highly volatile organic compound that has an important impact on human health. It has a strong stimulating effect on human mucosa and skin. The International Cancer Institute lists it as a suspected carcinogen and a major pollutant of indoor air. one. Indoors are places where people move the most frequently. The quality of the environment directly affects the health of each resident. Due to building insulation and int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C01B31/04
Inventor 陈志刚王荣飞赵晓兵付猛
Owner JIANGSU POLYTECHNIC UNIVERSITY
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