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Method for preparing adsorbent by using semi-coke modification

A technology of adsorbent and semi-coke, which is applied in the field of modified semi-coke to prepare adsorbents, which can solve the problems of strong corrosion of equipment, large environmental pollution, and high concentration, and achieve the effects of simple preparation process, avoiding serious pollution, and high yield

Inactive Publication Date: 2015-04-22
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical activation method generally uses a high concentration of activator acid or alkali, which is more corrosive to equipment and more polluting to the environment.

Method used

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  • Method for preparing adsorbent by using semi-coke modification
  • Method for preparing adsorbent by using semi-coke modification
  • Method for preparing adsorbent by using semi-coke modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Grind and sieve the blue charcoal to obtain blue charcoal powder of 100-120 mesh; according to the solid-to-liquid ratio of 1:5g / mL, add the blue charcoal powder to the nitric acid aqueous solution with a concentration of 2mol / L, and stir the reaction at 70°C 24h, then filter the precipitate, bake the precipitate at 100°C for 3 hours, put it in a muffle furnace, activate it at 400°C for 20min, cool it down to room temperature naturally, take out the product and grind it to about 200 mesh to get the adsorbent product.

[0023] The SEM photo of the raw material blue charcoal used in this embodiment is as figure 1 As shown, the SEM photo of the obtained adsorbent product is as follows figure 2 As shown, it can be seen from the figure that after the blue carbon is activated according to the method of the present invention, the roughness of the blue carbon surface increases significantly, the surface pores increase significantly, the internal pores are opened to a certain ...

Embodiment 2

[0026] Grind and sieve the blue charcoal to obtain blue charcoal powder of 180-200 mesh; according to the solid-to-liquid ratio of 1:15g / mL, add the blue charcoal powder to the nitric acid aqueous solution with a concentration of 3mol / L, and stir the reaction at 90°C 24h, then filter the precipitate, bake the precipitate at 100°C for 6 hours, put it in a muffle furnace, activate it at 400°C for 20min, cool it down to room temperature naturally, take out the product and grind it to about 200 mesh to get the adsorbent product.

[0027] The SEM photo of the raw material blue charcoal used in this embodiment is as figure 1 As shown, the SEM photo of the obtained adsorbent product is as follows image 3 As shown, it can be seen from the figure that after the blue carbon is activated according to the method of the present invention, the roughness of the blue carbon surface increases significantly, the surface pores increase significantly, the internal pores are opened to a certain ...

Embodiment 3

[0030] Grind and sieve the blue charcoal to obtain blue charcoal powder of 180-200 mesh; according to the solid-to-liquid ratio of 1:10g / mL, add the blue charcoal powder to the nitric acid aqueous solution with a concentration of 4mol / L, and stir the reaction at 90°C 24h, then filter the precipitate, bake the precipitate at 100°C for 6 hours, put it in a muffle furnace, activate it at 400°C for 20min, cool it down to room temperature naturally, take out the product and grind it to about 200 mesh to get the adsorbent product.

[0031] The SEM photo of the raw material blue charcoal used in this embodiment is as figure 1 As shown, the SEM photo of the obtained adsorbent product is as follows Figure 4 As shown, it can be seen from the figure that after the blue carbon is activated according to the method of the present invention, the roughness of the blue carbon surface increases significantly, the surface pores increase significantly, the internal pores are opened to a certain...

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Abstract

The invention discloses a method for preparing an adsorbent by using semi-coke modification. The method is characterized by comprising the following steps: grinding and screening semi-coke, thereby obtaining 80-200-mesh semi-coke powder; adding the semi-coke powder into an aqueous solution of nitric acid, carrying out stirring reaction at the temperature of 50-95 DEG C for 6-24 hours, filtering, drying, adding the powder into a muffle furnace, activating at the temperature of 300-500 DEG C for 10-60 minutes, grinding the activated product to 180-200 meshes, thereby obtaining the target product adsorbent. The adsorbent prepared by the invention has excellent adsorptive property, particularly has an excellent adsorption effect on phenolic substances in wastewater and has equivalent adsorptive property to that of commercial grade activated carbon. Moreover, the used semi-coke refers to industrial waste semi-coke, the wastes are changed into valuable materials, the process is simple, and the product application is wide.

Description

technical field [0001] The invention relates to the field of modified functional materials, in particular to a method for preparing an adsorbent by modified blue carbon. Background technique [0002] Semi-coke is the product of low-rank coal low-temperature dry distillation and medium-temperature gasification. Products with smaller particle sizes can only be used as low-grade fuels because they cannot meet the process requirements required for the production of ferroalloys, ferrosilicon, silicon carbide, and calcium carbide. Or cheap treatment has caused waste, and a large amount of waste semi-coke accumulation has also polluted the environment. Because blue carbon has the characteristics of low ash, low sulfur, low phosphorus, high specific resistance, fixed carbon, chemical activity, etc., and has a certain adsorption capacity, but it is not as good as ordinary activated carbon. By modifying it by physical or chemical methods, its specific surface area and pore volume can...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/20C02F1/283C02F2101/345
Inventor 魏凤玉吴波张进成张婉婷章琛
Owner HEFEI UNIV OF TECH
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