Coal tar-based ultra-high specific surface area nitrogen-containing porous carbon and preparation method and application thereof

A technology of ultra-high specific surface area and coal tar, which is applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of poor dye adsorption effect and achieve rich variety and quantity, The effect of increasing the utilization rate and reducing the price

Active Publication Date: 2019-10-25
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large molecular size of the dye, it is difficult for it to enter the microporous part of the activated carbon, so the adsorption effect of the microporous activated carbon on the dye is not good.

Method used

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  • Coal tar-based ultra-high specific surface area nitrogen-containing porous carbon and preparation method and application thereof
  • Coal tar-based ultra-high specific surface area nitrogen-containing porous carbon and preparation method and application thereof
  • Coal tar-based ultra-high specific surface area nitrogen-containing porous carbon and preparation method and application thereof

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preparation example Construction

[0041] As a further improvement of the present invention, the preparation method comprises the following steps:

[0042] (1) Take coal tar, calcium oxide and potassium hydroxide respectively, place in a grinder and grind to make the materials fully mixed to obtain a reactant;

[0043](2) Put the obtained reactant into the crucible, then put the crucible into the tube furnace, slowly and uniformly pass nitrogen gas to exhaust the air, slowly and uniformly raise the temperature to 850°C-900°C, and keep the constant temperature at 55 Cool down after -65min, and when it is down to room temperature, turn off the power and nitrogen, take out the crucible, take out the product, grind, pickle, put it on a magnetic stirrer and stir it evenly, then let it stand still, wash it to neutral, dry, and sieve to get the coal Tar-based porous carbon; preferably, the nitrogen flow rate is 6mL / min; the air in the device can be exhausted by ventilating for 30 minutes; the heating rate is preferabl...

Embodiment 1

[0054] This embodiment provides a coal tar-based ultra-high specific surface area nitrogen-containing porous carbon for dye adsorption. The porous carbon uses coal tar as a carbon source, calcium oxide as a template, and potassium hydroxide as an activator. Modified by ethylenediamine impregnation. Specific steps are as follows:

[0055] Step 1: Weigh 5g of coal tar, 10g of calcium oxide and 20g of potassium hydroxide respectively, place them in a grinder and grind them, so that the materials are fully mixed to obtain reactants;

[0056] Step 2: Put the obtained reactants into the crucible, then put the crucible into the tube furnace, feed nitrogen gas at a flow rate of 6mL / min, ventilate for 30min to exhaust the air in the device, and then raise the temperature at a rate of 5°C / min Raise the temperature to 900°C, keep the temperature constant for 60 minutes, and then cool down. When the tube furnace drops to room temperature, turn off the power and nitrogen, take out the cru...

Embodiment 2

[0065] This embodiment provides a coal tar-based ultra-high specific surface area nitrogen-containing porous carbon for dye adsorption. The porous carbon uses coal tar as a carbon source, calcium oxide as a template, and potassium hydroxide as an activator. Modified by ethylenediamine impregnation. Specific steps are as follows:

[0066] Step 1: Weigh 5g of coal tar, 10g of calcium oxide and 20g of potassium hydroxide respectively, place them in a grinder and grind them, so that the materials are fully mixed to obtain reactants;

[0067] Step 2: Put the obtained reactants into the crucible, then put the crucible into the tube furnace, feed nitrogen gas at a flow rate of 6mL / min, ventilate for 30min to exhaust the air in the device, and then raise the temperature at a rate of 5°C / min Raise the temperature to 850°C, keep the temperature constant for 60 minutes, and then cool down. When the tube furnace drops to room temperature, turn off the power and nitrogen, take out the cru...

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Abstract

The invention discloses coal tar-based ultra-high specific surface area nitrogen-containing porous carbon and a preparation method and application thereof, and belongs to the field of wastewater adsorbents. The preparation method comprises the steps that in the preparation process of the coal tar-based ultra-high specific surface area nitrogen-containing porous carbon, coal tar is used as a carbonsource, calcium oxide is used as a template and potassium hydroxide is used as activator for preparing the porous carbon, and the surface of the porous carbon is subjected to ethylenediamine impregnation modification; the obtained porous carbon has a specific surface area of more than 2000 m<2>/g, the surface of the porous carbon is rich in nitrogen-containing functional groups, and acid dye in wastewater can be adsorbed; and according to the coal tar-based ultra-high specific surface area nitrogen-containing porous carbon and the preparation method and application thereof, low operation cost, simple operation and stable operation are achieved, the purpose of efficiently removing the dye is achieved, and advanced treatment and up-to-standard discharge of the dye wastewater at the low costcan be realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous carbon materials, and in particular relates to a coal tar-based nitrogen-containing porous carbon with an ultra-high specific surface area and a preparation method and application thereof. Background technique [0002] During the production and use of dyes, about 10% to 20% of dyes are discharged with wastewater. Some dyes can enter the human body through the food chain, causing cell carcinogenesis and teratogenicity. Therefore, dye wastewater is harmful to the environment and human health. The commonly used methods for treating dye wastewater at home and abroad include physical, chemical and biological methods. The adsorption method is widely used in the treatment of dye wastewater due to its simple operation and excellent performance in treating pollutants under relatively mild conditions. Adsorbent is the core of adsorption technology. Activated carbon is the most widely used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28C02F1/28C02F101/30C02F101/34C02F101/38
CPCB01J20/20B01J20/28066B01J20/28064B01J20/0259C02F1/283C02F1/281C02F2101/38C02F2101/40C02F2101/34C02F2101/308
Inventor 王晓婷朱博文余谟鑫张晨蔡英健
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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