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Graphite-base carbon dioxide adsorbent and preparation method thereof

A carbon dioxide and graphite-based technology, applied in chemical instruments and methods, through adsorption, separation methods, etc., can solve the problems of easy volatilization or degradation of amines, decreased absorption capacity, poor stability, etc., and achieve easy desorption process and equipment corrosion The effect of small and high adsorption capacity

Inactive Publication Date: 2012-07-25
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its operation method is simple, it is not resistant to high temperature. If it is used under high temperature conditions, the amine is easy to volatilize or degrade when the adsorbent is regenerated, which reduces its absorption capacity, that is, its stability is poor.

Method used

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  • Graphite-base carbon dioxide adsorbent and preparation method thereof
  • Graphite-base carbon dioxide adsorbent and preparation method thereof
  • Graphite-base carbon dioxide adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 10g of graphite flakes and 100g of concentrated nitric acid into a clean and dry three-necked bottle, then raise the temperature to 100°C for 1 hour, cool to room temperature after the reaction and dilute the excess oxidant with distilled water, filter, wash and dry to obtain surface functionalization flake graphite.

[0028] Take 5 g of the above-mentioned surface-functionalized graphite flakes and disperse them in 50 g of water, add 0.5 g of polyallylamine (weight average molecular weight: 500), and react ultrasonically for 48 hours at 30° C., cool to room temperature after the reaction, filter, wash, and After drying, the flake graphite carbon dioxide adsorbent can be obtained.

[0029] Add 2.5 g of water to the dry flake graphite carbon dioxide adsorbent to obtain a wet flake graphite carbon dioxide adsorbent.

Embodiment 2

[0031] Add a mixture of 10g of expanded graphite, 1000g of concentrated nitric acid and concentrated sulfuric acid (mass ratio of 1:1) into a clean and dry three-necked flask, then heat up to 30°C for 48 hours, cool to room temperature after the reaction and dilute the excess oxidant with distilled water , filtered, washed and dried to obtain surface-functionalized expanded graphite.

[0032] Take 5g of the above-mentioned surface-functionalized expanded graphite and disperse it in 50g of water, add 10g of tetraethylenepentamine, and conduct ultrasonic reaction for 20 hours at 80°C. After the reaction, cool to room temperature, filter, wash and dry to obtain expanded graphite carbon dioxide adsorbent.

[0033] Add 10 g of water to the dry expanded graphite carbon dioxide adsorbent to obtain a wet state expanded graphite carbon dioxide adsorbent.

Embodiment 3

[0035] Add 10g of carbon nanotubes and 200g of concentrated nitric acid into a clean and dry three-necked bottle, then raise the temperature to 60°C and react for 36 hours. After the reaction, cool to room temperature and dilute the excess oxidant with distilled water, filter the diluted solution, wash and dry. Obtain surface functionalized carbon nanotubes.

[0036] Disperse 5 g of the surface-functionalized carbon nanotubes in 200 g of water, add 5 g of triethylenetetramine, and conduct ultrasonic treatment for 48 hours at 80 ° C. After the reaction, cool to room temperature, filter, wash, and dry to obtain carbon nanotubes. Nanotube carbon dioxide adsorbent.

[0037] Add 4 g of water to the above dry carbon nanotube carbon dioxide adsorbent to obtain a wet carbon nanotube carbon dioxide adsorbent.

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Abstract

The invention discloses a graphite-base carbon dioxide adsorbent and a preparation method thereof. The graphite-based carbon dioxide adsorbent comprises a graphite base material and a polyamine material which is bonded on the surface of the graphite base material by the aid of chemical bonds. The preparation method includes: (1), oxidizing the graphite base material by strong oxidizers so as to functionalize the surface of the graphite base material; and (2), bonding the polyamine material onto the functionalized surface of the graphite base material under action of catalysts or ultrasonic aids. The preparation method of the graphite-base carbon dioxide adsorbent is simple, the graphite-base carbon dioxide adsorbent prepared by the method has high adsorption capacity to carbon dioxide, can be reused and is high in stability, the defects that organic matters are easy to volatize and equipment is easy to corrode are overcome, and the requirement for industrial process is met.

Description

technical field [0001] The invention relates to a carbon dioxide adsorbent, in particular to a graphite-based carbon dioxide adsorbent and a preparation method thereof. Background technique [0002] In recent years, global warming has increasingly seriously affected the earth's ecological environment and climate change, including vegetation migration and species extinction, climate zone movement, sea level rise and land inundation, ocean current changes and El Niño frequency, etc. This is mainly caused by the warming effect of greenhouse gases such as carbon dioxide. According to the fourth assessment report of the United Nations Intergovernmental Committee of Experts on Climate Change, the global average surface temperature has increased by 0.6°C in the 20th century, and the sea level has risen by 0.1-0.2 meters. If no measures are taken, the global average surface temperature will be higher than that in 1990 by 2100 With an annual increase of 1.4°C-5.8°C, the sea level wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30B01D53/02
CPCY02C10/08Y02C20/40
Inventor 暴峰高洁马睿陈涛殷静赵呈蔡浩浩王东方
Owner HUAZHONG NORMAL UNIV
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