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Preparation of coir fiber based activated carbon with high specific surface area

A technology of high specific surface area and coir fiber, which is applied in the field of composite activators to prepare high specific surface area, high and medium porosity activated carbon, can solve the problems of few composite activators, little or no mesopore structure, and limit the application range of activated carbon, etc., to achieve High mesoporosity, low cost, enhanced activation effect

Inactive Publication Date: 2009-05-13
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on activators is relatively comprehensive. The chemical activators currently used mainly include: KOH, H 3 PO 4 , ZnCl 2 , NaOH, K 2 CO 3 、Na 2 CO 3 etc., but the existing methods all use a single activator, and there are still very few studies on compound activators
The specific surface area of ​​activated carbon prepared by existing methods can be as high as 3000m 2 Above 2nm, the adsorption performance has also been greatly improved, but these activated carbons are mainly micropores, with little or no mesopore structure, and have a strong adsorption capacity for small molecules below 2nm, but for medium molecules above 2nm or Macromolecular substances are powerless, which greatly limits the application range of activated carbon
However, there are still some technical difficulties in the preparation of activated carbon with mesoporous structure capable of adsorbing macromolecules.

Method used

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  • Preparation of coir fiber based activated carbon with high specific surface area
  • Preparation of coir fiber based activated carbon with high specific surface area
  • Preparation of coir fiber based activated carbon with high specific surface area

Examples

Experimental program
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Effect test

Embodiment 1

[0016] In this embodiment, coconut fiber is used as a raw material, and KOH is used as an activator.

[0017] First, the raw material coconut fiber is carbonized at 600°C for 30min, 7g of carbonized material is ground and mixed with KOH at a ratio of 1:2, and then the mixture is subjected to a constant temperature activation reaction at 850°C for 120min, and the heating rate is 15 °C / min. After the activation reaction, the product was taken out, ground and washed with tap water to remove KOH therein, and then chloride ions were washed away with distilled water. Then put it in a drying oven and dry it at 120°C before loading. The prepared activated carbon is mainly microporous, with an iodine adsorption value of 1894mg / g and a specific surface area of ​​2158m 2 .g -1 , The total pore volume is 1.0466ml.g -1 .

[0018] like figure 1 , figure 2 Shown are respectively the isotherm adsorption curve and the pore size distribution curve of the sample obtained in this embodime...

Embodiment 2

[0020] In this embodiment, coconut fiber is used as a raw material, and NaOH and KOH are used as composite activators.

[0021] First carbonize the raw material coconut fiber at 400°C, take 20g of carbonized material and composite activator at a ratio of 3:1:1 (NaOH:KOH:carbonized material), grind and mix evenly, put the mixture into a stainless steel tube and place it at 900 The activation reaction was carried out at ℃ for 120 minutes, and the heating rate of the activation reaction was 15 ℃ / min. After the activation reaction is completed, the product is taken out and washed with an appropriate amount of hydrochloric acid, then washed with excess deionized water, and finally dried and collected at 150°C. The prepared activated carbon has a high mesoporosity up to 24.8%, its iodine adsorption value is 1435.0mg / g, methylene blue adsorption value is 495mg / g, and its specific surface area is 2031.9m 2 / g, the yield can reach 48.76%.

[0022] like image 3 , Figure 4 Shown ar...

Embodiment 3

[0024] In this embodiment, coconut fiber is used as a raw material, and NaOH and KOH are used as composite activators.

[0025] First carbonize the raw material coconut fiber at 500°C, take 20g of carbonized material and composite activator at a ratio of 3:1:1 (NaOH:KOH:carbonized material), grind and mix evenly, put the mixture into a stainless steel tube and place it at 900 The activation reaction was carried out at ℃ for 150 min, and the heating rate of the activation reaction was 5 °C / min. After the activation reaction is completed, the product is taken out and washed with an appropriate amount of hydrochloric acid, then washed with excess deionized water, and finally dried and collected at 150°C. The activated carbon prepared in this example has a relatively high mesoporosity up to 25.2%, its iodine adsorption value is 1402.05mg / g, methylene blue adsorption value is 457.5mg / g, and its specific surface area is 1547m 2 / g, the yield can reach 49.59%.

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Abstract

The invention discloses a preparation method of coir base high specific surface area active carbon, which comprises the following steps: taking coir as raw material to be carbonized and obtaining carbonization material; activating the carbonization material and an alkalescent active agent after being mixed; washing or pickling a product; and then filtering and drying the product. The invention has simple technical process and low cost through taking the coir as the raw material, can effectively enhance the activation of the active agent, and is the preparation method of the active carbon which has the advantages of low cost, high efficiency, environmental protection and the like; and the prepared active carbon has the advantages of high specific surface area, narrow aperture distribution and high middle aperture ratio. The invention can be applied to energy storage materials, capacitors, efficient adsorbent, separating agent and gas adsorbent, hydrogen storage materials, and the like. Furthermore, the invention has wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon with high specific surface area and high and medium porosity by using coconut fiber as a raw material and using a composite activator. Background technique [0002] Activated carbon is an efficient adsorbent, and its research and application have entered a period of comprehensive development at this stage. On the one hand, with the development of modern industry and environmental science, new varieties of activated carbon such as impregnated carbon, spherical carbon, and fiber carbon have emerged; on the other hand, high-performance and specific activated carbon represented by activated carbon fiber and super activated carbon are continuously developed. The scope of application of activated carbon is further expanded. On the basis of maintaining continuous growth in traditional fields such as food, pharmaceuticals, light industry, ...

Claims

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Application Information

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IPC IPC(8): C01B31/08
Inventor 陈永李建保李玲周柳江陈润六
Owner HAINAN UNIVERSITY
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