Method for preparing porous carbon material through polyester low-temperature carbonization

A porous carbon material, low-temperature carbonization technology, applied in the preparation/purification of carbon, can solve the problems of high energy consumption and high carbonization temperature, and achieve the effects of reducing carbonization temperature, improving utilization rate and low cost

Active Publication Date: 2020-07-14
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing porous carbon material by low-temperature carbonization of polyester, which mixes transition metal oxides with polyester, and then carbonizes by heating, so as to reduce the carbonization of polyester Carbonization temperature, improve the utilization rate of polyester in the carbonization process, thus solve the technical problems of high carbonization temperature and high energy consumption in the prior art polyester carbonization method

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  • Method for preparing porous carbon material through polyester low-temperature carbonization
  • Method for preparing porous carbon material through polyester low-temperature carbonization
  • Method for preparing porous carbon material through polyester low-temperature carbonization

Examples

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Effect test

Embodiment 1

[0046] (1) Weigh 5g of polyethylene terephthalate and 5g of zinc oxide (produced by Sinopharm Chemical Reagent Co., Ltd.), put them into a ball mill, stir and mix at a speed of 50r / min for 10min, and obtain a homogeneous mixture of the two.

[0047] (2) Transfer the mixture obtained in step (1) to a crucible, put the crucible in a muffle furnace, set the muffle furnace to heat at a rate of 5°C / min, to a carbonization temperature of 320°C, and Keep warm at high temperature for 30min.

[0048] (3) After the muffle furnace is naturally cooled, the carbonized product is obtained, and the carbonized product is placed in a 0.5mol / L hydrochloric acid solution and soaked for 6 hours, then washed with water until neutral, and dried to obtain the carbon material, and the carbon material is weighed, The yield was 42 wt%. After adding 1mol / L ammonia solution dropwise to the filtrate, a precipitate is obtained, and zinc oxide can be recovered after drying and calcining.

[0049] The prep...

Embodiment 2

[0051] (1) Weigh 5g of polydiallyl terephthalate and 10g of copper oxide (produced by Sinopharm Chemical Reagent Co., Ltd.), put them into a ball mill, stir and mix at a speed of 50r / min for 10min, and obtain a uniform mixture of the two.

[0052] (2) Transfer the mixture obtained in step (1) to a crucible, put the crucible in a muffle furnace, set the muffle furnace to heat at a rate of 5°C / min, to a carbonization temperature of 340°C, and Keep warm at high temperature for 30min.

[0053] (3) After the muffle furnace is naturally cooled, the carbonized product is obtained, and the carbonized product is placed in a 0.5mol / L sulfuric acid solution and soaked for 6 hours, then washed with water until neutral, and dried to obtain the carbon material, and the quality of the carbon material is weighed, The yield was 33 wt%. After adding 1mol / L ammonia solution dropwise to the filtrate, a precipitate is obtained, and the copper oxide can be recovered after drying and calcining.

...

Embodiment 3

[0056] The carbonization temperature in the above-mentioned Example 1 was changed to 340° C., and the other steps remained unchanged, and a porous carbon material was obtained after post-treatment, with a yield of 38 wt%. The X-ray diffraction spectrum of the prepared carbon material is as follows image 3 shown. The carbon material prepared by carbonization of polyethylene terephthalate and zinc oxide was characterized by X-ray diffraction. It can be clearly seen from the figure that there are two diffraction characteristic peaks at the positions of 20o and 43o, corresponding to the (002) and (101) crystal planes of graphite, respectively. This shows that the prepared carbon material has the characteristics of amorphous carbon and partial graphitization. In addition, the prepared porous carbon material has a specific surface area as high as 1200 m 2 / g( Figure 4 ), with abundant micropores (50 nanometers), while the specific surface area of ​​carbon materials prepared by...

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Abstract

The invention belongs to the technical field of polymer carbonization, and particularly relates to a method for preparing a porous carbon material through polyester low-temperature carbonization. A mixture of polyester and transition metal oxide is heated and carbonized at the temperature not higher than 500 DEG C, and a porous carbon material is prepared after aftertreatment. The transition metaloxide is used for promoting decarboxylation reaction of polyester in the heating carbonization process, eliminating weak oxygen-containing chemical bonds in the polyester and generating an intermediate degradation product, and the intermediate degradation product is used for constructing a carbon material skeleton through crosslinking, cyclization and / or aromatization reaction to form the porouscarbon material. The porous carbon material with high specific surface area is prepared by adopting a one-step carbonization method and utilizing the transition metal oxide to promote the carbonization of the waste polyester at a lower temperature, and a new method is provided for converting a large amount of cheap urban and industrial waste polyester into the porous carbon material with high additional value.

Description

technical field [0001] The invention belongs to the technical field of polymer carbonization, and more specifically relates to a method for preparing porous carbon materials by low-temperature carbonization of polyester. Background technique [0002] With the rapid development of polymer materials in recent years, polymer materials represented by polyester plastics have been widely used in the fields of fibers, engineering plastics and packaging materials, and their consumption has also increased year by year. After use, these materials will generate a large amount of solid waste, which generally takes hundreds of years to degrade under natural conditions, which poses a huge pressure on environmental protection and sustainable development. Therefore, the recovery, treatment and recycling of waste polyester is an urgent problem to be solved, and more and more countries in the world pay attention to it. [0003] Generally, the disposal methods of waste polyester products incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 龚江刘宁郝亮张博易
Owner HUAZHONG UNIV OF SCI & TECH
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