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High-water-absorbing carbon material under low-humidity condition and modification and preparation method thereof

A technology of high water absorption and carbon materials, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of low water vapor adsorption capacity, achieve low cost of modification methods, high water adsorption capacity, and easy operation simple effect

Inactive Publication Date: 2014-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, one of the key issues of carbon materials used in rotary adsorption dehumidification technology is the low water vapor adsorption capacity under low humidity conditions.

Method used

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  • High-water-absorbing carbon material under low-humidity condition and modification and preparation method thereof
  • High-water-absorbing carbon material under low-humidity condition and modification and preparation method thereof
  • High-water-absorbing carbon material under low-humidity condition and modification and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the mass ratio of 0.2:1, add ammonium persulfate into 1M sulfuric acid solution and mix evenly to obtain a persulfuric acid solution; according to the mass ratio of 0.1:1, add the obtained mixed solution into the activated carbon material, stir and mix evenly, and heat at 40°C After 4 hours, the surface modification reaction was carried out; the resulting solution was filtered and dried at 100° C. to prepare a carbon material adsorbent with high water absorption under low humidity conditions. The water adsorption capacity of the prepared modified carbon material adsorbent at 40% humidity is 0.2 g / g.

Embodiment 2

[0028] According to the mass ratio of 1:1, add ammonium persulfate into 2M sulfuric acid solution and mix evenly to obtain a persulfuric acid solution; according to the mass ratio of 0.2:1, add the obtained mixed solution into the activated carbon material, stir and mix evenly, and heat at 60°C After 3 hours, the surface modification reaction was carried out; the resulting solution was filtered and dried at 120° C. to prepare a carbon material adsorbent with high water absorption under low humidity conditions. The water adsorption capacity of the prepared modified carbon material adsorbent at 40% humidity is 0.4 g / g.

Embodiment 3

[0030] According to the mass ratio of 1.5:1, add ammonium persulfate into 3M sulfuric acid solution and mix evenly to obtain a persulfuric acid solution; according to the mass ratio of 0.4:1, add the obtained mixed solution into the activated carbon material, stir and mix evenly, and heat at 60°C After 2 hours, the surface modification reaction was carried out; the resulting solution was filtered and dried at 135° C. to prepare a carbon material adsorbent with high water absorption under low humidity conditions. The water adsorption capacity of the prepared modified carbon material adsorbent at 40% humidity is 0.3 g / g.

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Abstract

The invention discloses a high-water-absorbing carbon material under the low-humidity condition and a modification and preparation method thereof. The modification of the carbon material comprises the following steps of: adding ammonium persulfate into sulfuric acid solution and mixing uniformly, thus obtaining peroxosulfuric acid solution; adding the mixed solution into an active carbon material, heating, stirring, mixing uniformly, and carrying out surface-modification reaction; filtering and drying the obtained solution to prepare a high-water-absorbing carbon material absorbing agent under the low-humidity condition. The modification method uses easily available materials and is simple to carry out, mild in modification condition and lower in cost; and the water-absorbing capacity of the modified carbon material is high under the low-humidity condition.

Description

technical field [0001] The invention relates to an adsorbent and its preparation, in particular to a highly water-absorbing carbon material under low-humidity conditions and its modified preparation method. Background technique [0002] The control of humidity environment not only improves the living environment of human beings, but also has an important impact on industrial production, gas drying and equipment operation. Ensuring a low-humidity environment is of great significance to improving living conditions, developing production technology, guaranteeing production technology, and improving product quality (Fang Yutang, Jiang Gan, research progress on adsorption materials for rotary dehumidifiers. Chemical Progress, 2005, 24, 1131 -1135.). [0003] Commonly used dehumidification methods include: freezing dehumidification, hot air dehumidification and adsorption dehumidification and so on. Among them, the adsorption dehumidification method uses adsorption materials to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/28B01D53/06
Inventor 肖静李忠叶飞燕王勋苗广
Owner SOUTH CHINA UNIV OF TECH
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