Method for preparing activated carbon

An activated carbon and carbonization technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of failure to describe the temperature and time of carbonization, failure to detect the ash content of the product, failure to elaborate on the properties of activated carbon, etc., and achieve good removal effect , low ash content and low price

Inactive Publication Date: 2011-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the activators used in this method are KOH, NaOH, K 2 CO 3 and Na 2 CO 3 , failed to elaborate on the properties of activated carbon prepared by a single activator; and its carbonization time was too long for 3 to 5 hours, and the specific carbonization temperature and time were not described in the examples; in addition, the ash content of the product was not tested

Method used

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  • Method for preparing activated carbon
  • Method for preparing activated carbon
  • Method for preparing activated carbon

Examples

Experimental program
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Embodiment 1

[0032] Take appropriate amount of rice husk in N 2 Carbonize at 400°C for 2 hours; mix solid NaOH and carbonized rice husk evenly according to the alkali-carbon ratio of 3:1, first in N 2 Preheat at 400°C for 30min, then activate at 800°C for 2h; pickle with 0.1mol / L HCl; wash with water, filter, dry, and grind to obtain a specific surface area of ​​2428.05m 2 / g, an activated carbon product with an ash content of 3.76%.

Embodiment 2

[0034] Take an appropriate amount of rice husk and carbonize at 700°C for 2 hours; mix the reactants according to the alkali-carbon ratio of 3:1, preheat at 400°C for 30 minutes, activate at 800°C for 2 hours; pickle with 0.1mol / L HCl; wash with water, filter, dry, and grind to obtain The specific surface area is 1993.98m 2 / g, the product with an ash content of 3.23%.

Embodiment 3

[0036] Take an appropriate amount of rice husk and carbonize at 600°C for 2 hours; mix the reactants according to the alkali-carbon ratio of 3:1, preheat at 400°C for 30 minutes, activate at 800°C for 1 hour; pickle with 0.1mol / L HCl; wash with water, filter, dry, and grind to obtain The specific surface area is 2186.36m2 / g, the product with an ash content of 4.89%.

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Abstract

The invention relates to a method for preparing activated carbon. In the method, rice husks are taken as a raw material, NaOH is taken as an activator, and an activated carbon product is prepared through high temperature carbonization and activation, has high specific surface area, low ash content, a large number of distributed micropores, and high adsorption property, and is an ideal adsorption material, an ideal electrode material, an ideal hydrogen storage material and an ideal catalyst carrier. Alkaline solution is not required to be used for impregnation and activation, and the obtained product has a small particle size, has the characteristics of wide raw material source, low cost and simple process, is suitable for popularization, and has certain economic significance and environment-friendly significance.

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 low ash content by using rice husks. Background technique [0002] Activated carbon (AC) is a porous carbon material, because of its large specific surface area (500-1500m 2 / g), wide source of raw materials, high mechanical strength, safe and easy to regenerate, good stability, widely used in chemical industry, environmental protection, medicine, military and other fields, is an excellent adsorption material and catalyst carrier. The adsorption of activated carbon is related to the specific surface area, pore structure, surface functional groups and adsorbate properties. Generally, the larger the specific surface area of ​​activated carbon, the more micropores (d<2nm), the stronger the adsorption capacity; when the pore size is 2 to 4 times the size of the adsorbate, it is also conducive to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C01B31/08
Inventor 宋晓岚张颖
Owner CENT SOUTH UNIV
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