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Method for preparing stone coal based mesoporous activated carbon with high specific surface area

A high specific surface area, activated carbon technology, applied in the field of activated carbon preparation, can solve the problems of complicated preparation process steps, low methylene blue adsorption value, and no high-efficiency utilization, and achieve the effects of environmental friendliness, low production cost, and less equipment

Inactive Publication Date: 2015-01-21
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly has the following deficiencies: the preparation of activated carbon from coal does not reflect the efficient utilization of energy material coal; the preparation process uses two kinds of strong alkali, and the obtained activated carbon has a low porosity
The main disadvantages of this method: (1) need to pass into N at intervals in the preparation process 2 Gas three times, air once and water vapor once, the preparation process steps are complicated, time-consuming and require high equipment
(3) The specific surface area of ​​the prepared coal-based mesoporous activated carbon is small (only 311.89-695.98m 2 g -1 ), methylene blue adsorption value is low (only 120~150.79mg·g -1 )

Method used

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  • Method for preparing stone coal based mesoporous activated carbon with high specific surface area
  • Method for preparing stone coal based mesoporous activated carbon with high specific surface area
  • Method for preparing stone coal based mesoporous activated carbon with high specific surface area

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Experimental program
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Effect test

Embodiment 1

[0022] A preparation method of stone coal-based mesoporous activated carbon with high specific surface area, the concrete steps are as follows:

[0023] (1) Deashing of stone coal raw materials

[0024] Pulverize the stone coal to below 200 mesh (0.074mm), and prepare the pickling solution according to the ratio of hydrofluoric acid volume (ml): concentrated sulfuric acid volume (ml): distilled water volume (ml) ratio of 1:2:85, to The ratio of the mass of stone coal (g) to the volume of acid leaching solution (ml) is 1:12 and mixed, placed in a 400ml reaction vessel, stirred at a constant temperature of 80°C for 2 hours, suction filtered, washed, and dried to obtain deashed of stone coal.

[0025] (2) Preparation of activated carbon crude product

[0026] After the first step (1) is completed, it is placed in the muffle furnace according to the ratio of delimed stone coal mass (g): potassium hydroxide mass (g) of 1: 4, with 100ml min -1 Access to N 2 gas, then at 10°C·min...

Embodiment 2

[0030] A kind of preparation method of stone coal-based mesoporous active carbon of high specific surface area, with embodiment 1, wherein:

[0031] In the (1) step, hydrofluoric acid volume (ml): concentrated sulfuric acid volume (ml): the ratio of distilled water volume (ml) is 1: 3: 80, stone coal quality (g): pickling solution volume (ml) The ratio is 1:6, the stirring temperature is 75°C, and the stirring time is 1h.

[0032] In step (2), the ratio of the mass of delimed stone coal (g): the mass of potassium hydroxide (g) is 1:2, the activation temperature is 850° C., and the activation is performed for 2.0 h.

[0033] In step (3), ultrasonic-assisted pickling was carried out for 20 minutes, the activated carbon was boiled in hot water for 20 minutes, and the boiling was repeated once.

Embodiment 3

[0035] A kind of preparation method of stone coal-based mesoporous active carbon of high specific surface area, with embodiment 1, wherein:

[0036] In the (1) step, hydrofluoric acid volume (ml): concentrated sulfuric acid volume (ml): the ratio of distilled water volume (ml) is 1: 4: 75, stone coal quality (g): pickling solution volume (ml) The ratio is 1:18, the stirring temperature is 90°C, and the stirring time is 3h.

[0037] In step (2), the ratio of the mass of delimed stone coal (g): the mass of potassium hydroxide (g) is 1:3, the activation temperature is 750° C., and the activation is performed for 1.5 h.

[0038] In step (3), ultrasonic-assisted pickling was carried out for 25 minutes, the activated carbon was boiled in hot water for 15 minutes, and the boiling was repeated twice.

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Abstract

The invention discloses a method for preparing stone coal based mesoporous activated carbon with a high specific surface area, belonging to the field of activated carbon preparation. The method comprises the following steps: by taking stone coal as a raw material and mixed acid of hydrofluoric acid-concentrated sulfuric acid as pickle liquor, performing deliming pretreatment on the raw material, activating by using potassium hydroxide, pickling by using diluted hydrochloric acid under the assistance of ultrasonic waves, boiling with hot water, and finally drying, thereby obtaining a product. The raw material used in the method is rich in source, the preparation process is simple, the time consumption is less, a small amount of equipment is needed, the production cost is low, and the environment is protected. The specific surface area of the activated carbon prepared by using the method disclosed by the invention is up to 1524.82m<2>.g<-1>, the mesoporosity is 98.3%, the total pore volume is 0.74cm<3>.g<-1>, the average aperture is 2.4nm, the methylene blue adsorption value is 792.93mg.g<-1>, and the activated carbon is stone coal based mesoporous activated carbon with the high specific surface area.

Description

technical field [0001] The invention belongs to the field of active carbon preparation, and in particular relates to a preparation method of stone coal-based mesoporous active carbon with high specific surface area. Background technique [0002] Activated carbon is a multifunctional carbon material with rich pore structure. The existing microporous activated carbon is widely used in the fields of removing industrial waste gas and storing gas. Mesopores have good adsorption properties for macromolecular particles, so mesoporous adsorbents such as mesoporous activated carbon have a wide range of applications in the fields of water treatment, food decolorization, and catalyst carriers. There are abundant raw materials for preparing activated carbon, and natural materials such as fruit shells and wood can be used to prepare activated carbon. In particular, my country has large reserves of stone coal mines, and the carbon content in vanadium-containing stone coal is relatively ...

Claims

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Application Information

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IPC IPC(8): C01B31/12
Inventor 刘成伦廖婷徐龙君
Owner CHONGQING UNIV
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