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Preparation method of activated carbon with high pore volume

A technology of activated carbon and high porosity, applied in the field of preparation of high pore volume activated carbon, can solve the problem of difficulty in preparing high pore volume activated carbon and the like

Active Publication Date: 2010-02-17
浙江瑞能炭材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to produce high pore volume activated carbon only by increasing the amount of phosphoric acid activator used to increase the specific pore volume of activated carbon.

Method used

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  • Preparation method of activated carbon with high pore volume
  • Preparation method of activated carbon with high pore volume

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After mixing 10mL of ammonium persulfate solution with a concentration of 2% (w / w) and 80mL of 50% (w / w) phosphoric acid solution, and then mixing it with 20.0g of Chinese fir sawdust, the weight of Chinese fir sawdust, phosphoric acid and ammonium persulfate The ratio is 1:2.4:0.01, soaked at 70°C for 10h, the obtained mixed material is heated to 500°C at a heating rate of 5°C / min, activated for 1h, then taken out, washed with water until the pH of the filtrate reaches 6-7, Dry at 120°C to obtain the product activated carbon. Its specific surface area is 1970m 2 / g, the total pore volume is 1.872cm 3 / g, the mesopore volume is 1.354cm 3 / g, accounting for 72.5% of the total pore volume. Its caramel decolorization rate is 130%.

Embodiment 2

[0027] Concentration is after the hydrogen peroxide solution 10mL of 3% (w / w) is mixed with the phosphoric acid solution of 100mL 50% (w / w), after mixing with the Chinese fir sawdust of 20.0g again, the weight ratio of Chinese fir sawdust, phosphoric acid and hydrogen peroxide is 1: 3.0:0.015, impregnated at 80°C for 10h, the obtained mixed material was heated to 500°C at a heating rate of 3°C / min, activated for 1h, then taken out, washed with water until the pH of the filtrate reached 6-7, and dried at 100°C to obtain Product Activated Carbon. Its specific surface area is 2430m 2 / g, the total pore volume is 2.382cm 3 / g, the mesopore volume is 1.798cm 3 / g, accounting for 75.5% of the total pore volume. Its caramel decolorization rate is 145%.

Embodiment 3

[0029] After mixing 10mL of ammonium persulfate solution with a concentration of 5% (w / w) and 100mL of 40% (w / w) phosphoric acid solution, after mixing with 20.0g of crushed coconut shell raw materials, coconut shell, phosphoric acid and persulfate The weight ratio of ammonium sulfate is 1:2.7:0.025, soaked at 85°C for 12h, the obtained mixed material is heated up to 550°C at a heating rate of 5°C / min, activated for 2h, then taken out, washed with water until the filtrate reaches pH 6-7, dry at 120°C to obtain the product activated carbon. Its specific surface area is 2210m 2 / g, the total pore volume is 1.934cm 3 / g, the mesopore volume is 1.297cm 3 / g, accounting for 67.1% of the total pore volume. Its caramel decolorization rate is 140%.

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Abstract

The invention discloses a preparation method of activated carbon with high pore volume, which comprises the following steps: after phosphoric acid and an activating auxiliary agent are prepared into asolution, mixing the biomass material, the activating agent phosphoric acid and the activating auxiliary agent according to the weight ratio of 1:1-5:0-0.05; dipping the mixture for 2-16h at 50-100 DEG C, raising the temperature to 400-600 DEG C at the temperature raising rate of 1-5 DEG C / min, and then, activating the mixture for 1-2h; and taking out the mixture and washing with water until thepH value of the filtered solution reaches 6-7, drying the mixture to the balance weight at 100-120 DEG C, thus, obtaining an activated carbon product. The preparation method of activated carbon with high pore volume successfully uses the phosphoric acid activating biomass material for preparing the activated carbon with high pore volume which reaches 2.6cm<3> / g by solving the difficult problem that in the traditional phosphoric acid activating process, the phosphoric acid solution is difficult to fully permeate into biomass material particles. The method has the characteristics of easy control, little pollution, easy industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for preparing activated carbon with high pore volume. Background technique [0002] Activated carbon is a porous carbon material with developed pore structure and large specific surface area. As an excellent adsorbent, it has been widely used in environmental protection, chemical industry, food industry, hydrometallurgy, pharmaceutical refining, military chemistry protection and many other fields. In order to meet the needs of various applications, a wide variety of activated carbons have been developed. But their specific surface area is usually 800 ~ 1500m 2 / g, the adsorption capacity is limited. Therefore, the production of activated carbon with high adsorption capacity is the prerequisite for the efficient utilization of activated carbon, and it has also become the focus of research on the preparation of activated carbon. Especially with ...

Claims

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Application Information

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IPC IPC(8): C01B31/12
Inventor 左宋林杨建校
Owner 浙江瑞能炭材料科技有限公司
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