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Simple preparation method of honeycomb porous carbon with high specific surface area

A high specific surface area, honeycomb technology, applied in the preparation/purification of carbon, etc., can solve the problems of high production cost, difficult pore making, complicated process, etc., and achieve the effect of low cost and large-scale production and application.

Active Publication Date: 2020-11-27
XUCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of high production cost, complex process, difficulty in pore formation and uneven pores in the existing preparation of porous carbon materials.

Method used

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  • Simple preparation method of honeycomb porous carbon with high specific surface area
  • Simple preparation method of honeycomb porous carbon with high specific surface area
  • Simple preparation method of honeycomb porous carbon with high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 100mL glycerin and 2.5g zinc acetate to a 250mL round bottom flask, heat to reflux at 150°C for 2h, collect the white solid precipitate, wash with ethanol three times, and dry in vacuum to obtain the organic complex powder.

[0037] The obtained product was placed in a tube furnace, under the protection of nitrogen, treated at a high temperature of 800°C for 1 hour, and after natural cooling and light grinding, a mixture powder of black porous carbon and ZnO was obtained. From the XRD test results, it can be seen that the characteristic peak of ZnO is obvious, and compared with the standard card (#99-0111) has the same characteristic peaks ( figure 1 ).

[0038] The above powder is added to dilute hydrochloric acid solution and stirred to remove the hard template, washed with water until neutral and then dried to obtain honeycomb porous carbon.

[0039] X-ray diffractometer and scanning electron microscope were used to characterize the material, and it was found th...

Embodiment 2

[0042] Weigh 4.2g of zinc acetate into an autoclave, add 100mL of glycerin, stir to dissolve, keep solvothermal reaction at 150°C for 1h, centrifuge and wash with alcohol to obtain a white precipitate.

[0043] Under the protection of nitrogen, the obtained product was subjected to high temperature treatment at 600° C. for 2 hours, and a mixture of porous carbon and zinc oxide was obtained after grinding.

[0044] The above mixture was added into dilute hydrochloric acid solution for ultrasonic dispersion, stirred overnight, washed with water until neutral, and dried to obtain honeycomb porous carbon with high specific surface area.

[0045] Figure 4 As shown, the obtained porous carbon has a rich pore structure, and it can be seen from the enlarged scanning electron microscope that the pores are evenly distributed throughout the carbon body structure, showing a honeycomb shape.

[0046] Figure 5 It is the nitrogen adsorption-desorption curve and pore size distribution dia...

Embodiment 3

[0048] Weigh 5.9g of zinc acetate and place it in a round bottom flask, add 100mL of glycerin to stir the reaction, and keep the reaction at reflux at 120°C for 5h. The precipitate after the reaction was collected, washed with centrifuged alcohol and dried to obtain the organic complex.

[0049] Put the above solid in a tube furnace for vacuum calcining, keep it at 900°C for 3 hours to obtain a black solid, which is zinc oxide and porous carbon, add dilute hydrochloric acid after grinding to remove the hard template, wash with water until neutral, and dry the final black solid in vacuum to obtain Honeycomb porous carbon.

[0050] From Figure 6 It can be seen from the TEM image that the porous carbon pores in this embodiment are very rich, and there are a large number of pores of about 10-20nm uniformly distributed in the entire carbon body structure, and the pore walls are relatively thin. Figure 7 The mesoporous pore size distribution of the porous carbon obtained in this...

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Abstract

The invention relates to a simple preparation method of honeycomb porous carbon with a high specific surface area. The preparation method comprises the following steps: mixing zinc acetate with glycerol for reaction to obtain an organic complex containing glycerol acetate and zinc glyceroxide; and calcining and cracking the organic complex precipitate containing glycerol acetate and glycerozinc athigh temperature to remove the soft template glycerol acetate, cleaning with dilute acid to remove zinc oxide, and collecting to obtain the honeycomb porous carbon. The method is novel in thought andsimple and convenient to operate, the preparation of the honeycomb porous carbon with the high specific surface area is controllably prepared by an in-situ dual-template strategy through a simple one-step method, and the obtained porous carbon is high in specific surface area and relatively uniform in pore structure.

Description

technical field [0001] The invention belongs to the technical field of nanoporous carbon materials, and in particular relates to a preparation method of porous carbon. Background technique [0002] Honeycomb porous carbon has a large specific surface area, excellent conductivity and stability, and has been widely used in many fields such as energy storage and conversion, catalysis, adsorption, and environmental detection. Therefore, the research and development of porous carbons with high specific surface area has attracted a lot of attention from researchers at home and abroad. At present, the preparation methods of porous carbon mainly include template method and activation method, and the template method is divided into hard template and soft template. The activation method is mainly to use various activators to etch the carbon material to different degrees under high temperature conditions to obtain porous carbon. The activator with better effect is KOH. However, this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05
CPCC01B32/05Y02E60/13
Inventor 李婷婷柴永康左云鹏朱聪旭蔡锟郭煜张鑫容
Owner XUCHANG UNIV
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