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Method for preparing mesoporous carbon

A mesoporous carbon and solution technology, applied in the field of adsorption, can solve the problems of environmental protection and time-consuming

Inactive Publication Date: 2017-12-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this post-processing method is time-consuming and not environmentally friendly.

Method used

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  • Method for preparing mesoporous carbon
  • Method for preparing mesoporous carbon
  • Method for preparing mesoporous carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of ZIF-8

[0028] Firstly, 50 mL of 0.64 mol / L methanol solution of 2-methylimidazole and 50 mL of 0.16 mol / L methanol solution of zinc nitrate hexahydrate were prepared. Put the prepared 2-methylimidazole methanol solution into a beaker, add zinc nitrate hexahydrate methanol solution under stirring state, continue to stir for 10 min and then let it stand for reaction for 4 h; after standing, the product is centrifuged and washed with absolute ethanol for 3 times, and finally put the final sample in the oven for 60 o Bake at C for 24 h.

[0029] (2) Preparation of mesoporous carbon

[0030] Weigh 2 g of dry ZIF-8 in a tube furnace, use a vacuum pump to extract part of the air in the tube, then fill the tube with nitrogen, control the initial oxygen concentration in the tube to 8.4%, then turn on the instrument to heat up, nitrogen, Maintain a flow rate of 60 mL / min, raise the temperature to 800 °C at a rate of 5 °C / min and maintain it for 5 h, then co...

Embodiment 2

[0038] (1) Preparation of ZIF-8

[0039] Firstly, 50 mL of 0.64 mol / L methanol solution of 2-methylimidazole and 50 mL of 0.16 mol / L methanol solution of zinc nitrate hexahydrate were prepared. Put the prepared 2-methylimidazole methanol solution into a beaker, add zinc nitrate hexahydrate methanol solution under stirring, continue stirring for 30 min, and then let it stand for 6 h; after standing, the product was centrifuged and washed with absolute ethanol for 3 times, and finally the final sample was placed in an oven for 90 o Bake at C for 12 h.

[0040] (2) Preparation of mesoporous carbon

[0041]Weigh 2 g of dry ZIF-8 in a tube furnace, use a vacuum pump to extract part of the air in the tube, then fill the tube with nitrogen, control the initial oxygen concentration in the tube to 6.3%, then turn on the instrument to heat up, and nitrogen, Maintain a flow rate of 70 mL / min, raise the temperature to 600 °C at a rate of 2 °C / min and maintain it for 2 hours, then cool ...

Embodiment 3

[0045] (1) Preparation of ZIF-8

[0046] Firstly, 50 mL of 0.64 mol / L methanol solution of 2-methylimidazole and 50 mL of 0.16 mol / L methanol solution of zinc nitrate hexahydrate were prepared. Put the prepared 2-methylimidazole methanol solution into a beaker, add zinc nitrate hexahydrate methanol solution under stirring, continue to stir for 20 min, and then let it stand for 2 h; after standing, the product was centrifuged and washed with absolute ethanol for 3 times, and finally put the final sample in the oven for 60 o Bake at C for 24 h.

[0047] (2) Preparation of mesoporous carbon

[0048] Weigh 2 g of dry ZIF-8 in a tube furnace, use a vacuum pump to extract part of the air in the tube, then fill the tube with helium, control the initial oxygen concentration in the tube to 16.8%, then turn on the instrument to heat up, and pass helium Keep the flow rate at 60 mL / min, raise the temperature to 1000 °C at a rate of 10 °C / min and maintain it for 10 h, then cool naturall...

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Abstract

The invention relates to a method for preparing mesoporous carbon and belongs to the technical field of adsorption. The mesoporous carbon is prepared by the steps: by taking ZIF-8 as a precursor, calcining the ZIF-8 by adopting a slow temperature programming carbonization method, controlling the initial oxygen concentration, and producing the mesoporous carbon material. The method disclosed by the invention has the advantages that trace oxygen is added in the ZIF-8 carbonization process, so that the mesoporous rate of the carbonization material is improved, and the prepared mesoporous carbon has excellent adsorptive property in the methylene blue adsorption experiment.

Description

technical field [0001] The invention relates to a method for preparing mesoporous carbon, in particular to a method for preparing mesoporous carbon used for methylene blue dye wastewater adsorption, and belongs to the technical field of adsorption. Background technique [0002] Metal-organic framework materials (MOFs) are ordered nanoporous materials. Due to their large specific surface area, pore tunability, and ordered pore structure, they have been used in many fields, such as catalysis, gas separation, and electrochemistry. Wait. [0003] Recently, the preparation of porous carbon materials using metal-organic frameworks (MOFs) as precursors has received extensive attention. In 2012, people such as Chaikittisilp directly carbonized ZIF-8 and found that the higher the carbonization temperature, the larger the specific surface area and pore volume of the carbonized sample, and the material has excellent electrochemical properties (Chem Commun, 2012, 48(58): 7259 -7261). ...

Claims

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Application Information

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IPC IPC(8): C01B32/05
CPCC01P2004/03C01P2006/17
Inventor 杜艳王春宇陈日志
Owner NANJING UNIV OF TECH
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