Active carbon-silicon aerogel complex for removing volatile organic pollutants

A volatile organic and silicon airgel technology, which is applied in the fields of alkali metal compounds, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of high specific surface area and porosity, low mechanical strength, and large mass transfer resistance and other problems, to achieve the effect of increasing adsorption capacity, low cost, and reducing mass transfer resistance

Active Publication Date: 2011-07-20
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silica airgel is an amorphous solid porous material with adjustable structure. It has low density, high specific surface area and porosity, good adsorption performance, and surface hydrophobic treatment, but its structure is fragile and its mechanical strength is low. Low
Activated carbon is low in cost and has a well-developed micropore system and specific surface area. However, when adsorbing macromolecular substances, the pores are easily blocked, the mass transfer resistance is large, regeneration is difficult, and there are flammable safety hazards in engineering applications.

Method used

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  • Active carbon-silicon aerogel complex for removing volatile organic pollutants
  • Active carbon-silicon aerogel complex for removing volatile organic pollutants
  • Active carbon-silicon aerogel complex for removing volatile organic pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: 10 mL of water glass was diluted 4 times with deionized water, and ion-exchanged with a strong acid type cation exchange resin to obtain a silicic acid solution. Under the condition of magnetic stirring, 1 mol / L ammonia water was added dropwise to the silicic acid solution until the pH value rose to 5, and then stood still after stirring. Add 1g of activated carbon powder just before the gel is formed, stir evenly and let it stand for aging. The wet gel was solvent-exchanged with absolute ethanol and n-hexane in turn, and then surface hydrophobized modification was carried out with n-hexane solution containing 20% ​​trimethylchlorosilane. The obtained gel was dried at 60°C, 80°C, 120°C and 180°C under normal pressure for 6 hours to obtain the activated carbon-silica airgel composite CSA-2.

Embodiment 2

[0023] Example 2: 10 mL of water glass was diluted 4 times with deionized water, and ion-exchanged with a strong acid type cation exchange resin to obtain a silicic acid solution. Under the condition of magnetic stirring, 1 mol / L sodium hydroxide was added dropwise to the silicic acid solution until the pH value rose to 5, and then left to stand after stirring. Add 2g of activated carbon powder just before the gel is formed, stir evenly and let it stand for aging. The wet gel was solvent-exchanged with absolute ethanol and n-hexane in turn, and then surface hydrophobized modification was carried out with n-hexane solution containing 20% ​​trimethylchlorosilane. The obtained gel was dried at 60°C, 80°C, 120°C and 180°C under normal pressure for 6 hours to obtain the activated carbon-silica airgel composite CSA-4.

Embodiment 3

[0024] Example 3: 10 mL of water glass was diluted 4 times with deionized water, and ion-exchanged with a strong acid type cation exchange resin to obtain a silicic acid solution. Under the condition of magnetic stirring, 1 mol / L ammonia water was added dropwise to the silicic acid solution until the pH value rose to 5, and then stood still after stirring. Add 4g of activated carbon powder just before the gel is formed, stir evenly and let it stand for aging. The wet gel was solvent-exchanged with absolute ethanol and n-hexane in sequence, and then the surface of the wet gel was hydrophobized with a n-hexane solution containing 20% ​​methyltriethoxysilane. The obtained gel was dried at 60°C, 80°C, 120°C and 180°C under normal pressure for 6 hours to obtain the activated carbon-silica airgel composite CSA-8.

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Abstract

The invention relates to an active carbon-silicon aerogel complex and a preparation method thereof, and belongs to the field of removal of volatile organic pollutants. The active carbon-silicon aerogel complex is prepared from active carbon granules serving as a skeleton structure and water glass serving as a silicon aerogel precursor by sol-gel reaction and normal-pressure drying. The active carbon-silicon aerogel complex is prepared from cheap raw materials, has a multistage pore structure, and is favorable for improving the adsorption quantity of volatile organic compounds (VOCs), reducingthe mass transfer resistance and improving the desorption efficiency.

Description

technical field [0001] The invention relates to an activated carbon-silicon airgel composite and a preparation method thereof, and also belongs to the field of removal of volatile organic pollutants. Background technique [0002] Volatile organic compounds (VOCs for short) refer to organic compounds whose saturated vapor pressure exceeds 70.91Pa at normal temperature and boiling point at normal pressure is less than 260°C. In recent years, the problem of air pollution caused by VOCs has become increasingly serious. These substances can not only generate photochemical smog, destroy the ozone layer, but also seriously endanger human health. Among the many VOCs treatment technologies, the adsorption method has been widely used due to its advantages of low energy consumption and low operating cost. Adsorbents used to treat VOCs should have the characteristics of high adsorption-desorption rate, high adsorption capacity and adsorption selectivity. [0003] Silica airgel is an a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/02
CPCY02A50/20
Inventor 郝郑平豆宝娟李进军麻春艳窦广玉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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