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Graphene oxide/hectorite/chitosan aerogel solid amine adsorbent and preparation method and application thereof

A technology of chitosan gel and laponite, which is applied in chemical instruments and methods, alkali metal oxides/hydroxides, gas treatment, etc., can solve the problem of poor recovery and use of catalysts, which is not conducive to the application of a large amount of adsorbed gases , Chemical cross-linking is easy to be uneven, etc., to achieve excellent carbon dioxide adsorption performance, low price, and good cross-linking effect

Active Publication Date: 2019-07-26
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

However, ionic liquids also have their own disadvantages: the product is not easy to separate; the recycling effect of the catalyst is not good; as a solvent, the price of ionic liquid is much higher than that of common organic solvents
After dissolving chitosan in an acidic solution, the viscosity of the system increases, the chemical cross-linking is easily uneven, and the cross-linking reduces the active sites, which is not conducive to the application of a large amount of adsorbed gases

Method used

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  • Graphene oxide/hectorite/chitosan aerogel solid amine adsorbent and preparation method and application thereof
  • Graphene oxide/hectorite/chitosan aerogel solid amine adsorbent and preparation method and application thereof
  • Graphene oxide/hectorite/chitosan aerogel solid amine adsorbent and preparation method and application thereof

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preparation example Construction

[0041] Please refer to figure 2 , the present invention also provides the preparation method of above-mentioned graphene oxide / hectorite / chitosan airgel type solid amine adsorbent, comprising the following steps:

[0042] Step S1, preparing the graphene oxide / hectorite composite: ultrasonically mixing the aqueous solution of graphene oxide and the aqueous solution of modified hectorite, then adding 5% dilute hydrochloric acid to adjust the pH value to 1-2, and standing, Centrifuge to obtain a precipitate, wash the precipitate with deionized water to neutrality, and dry to obtain a graphene oxide / laponite composite;

[0043] Step S2, cross-linking by electron beam irradiation: weigh chitosan and dissolve it in 1% acetic acid solution, then add the graphene oxide / hectorite composite prepared in step S1, stir at high speed until uniform, and use high-energy electron beam Irradiation, cross-linking the system to obtain graphene oxide / hectorite / chitosan gel; wherein, the mass vol...

Embodiment 1

[0048] Take 1.0g of hectorite, add 25mL of toluene, ultrasonic treatment for 30min to disperse evenly, then add 2mL of 3-aminopropyltriethoxysilane (APTES), stir and condense at 110℃ for 24h, centrifuge the system , to obtain a solid precipitate, wash the solid precipitate three times with toluene and ethanol in turn, and dry it under vacuum at 40°C to obtain the modified hectorite; weigh 0.3g of the modified hectorite to prepare a 60mL aqueous solution of the modified hectorite , Weigh 0.3g of graphene oxide and configure 60mL of graphene oxide aqueous solution, mix evenly by ultrasonic, add 5% dilute hydrochloric acid until the pH of the solution is 2.0, let it stand, use a high-speed centrifuge to centrifuge to obtain a precipitate, wash with deionized water The precipitate was neutralized, and vacuum freeze-dried to obtain a graphene oxide / hectorite composite; 2.0g chitosan was dissolved in 150mL of 1% acetic acid solution, and then 0.2g graphene oxide / hectorite composite w...

Embodiment 2

[0050] Weigh 2.0g of hectorite, add 60mL of toluene, and ultrasonically treat it for 1h to disperse evenly, then add 5mL of 3-aminopropyltriethoxysilane (APTES), stir and condense at 110°C for 24h, and dissolve the system Centrifuge to obtain a solid precipitate, wash the solid precipitate three times with toluene and ethanol in sequence, and dry it in vacuum at 40°C to obtain the modified hectorite; weigh 0.5g of the modified hectorite to prepare 100mL of the modified hectorite Weigh 0.5g of graphene oxide to form 100mL of graphene oxide aqueous solution, mix evenly by ultrasonic, add 5% dilute hydrochloric acid until the pH of the solution is 1.0, let it stand, and use a high-speed centrifuge to obtain a precipitate. Wash the precipitate with ionic water to neutrality, and vacuum freeze-dry to obtain the graphene oxide / hectorite composite; dissolve 1.0g chitosan in 80mL of 1% acetic acid solution, and then add 0.2g graphene oxide / hectorite Composite, the system is stirred at...

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Abstract

The invention provides a preparation method of a graphene oxide / hectorite / chitosan aerogel solid amine adsorbent. The preparation method includes steps: ultrasonically and uniformly mixing aqueous solution of graphene oxide and aqueous solution of modified hectorite, adding acid solution to adjust a pH value, standing and centrifuging to obtain a precipitant; washing the precipitant to neutral bydeionized water, and drying to obtain a graphene oxide / hectorite compound; weighing chitosan, dissolving into acetic acid solution, adding the graphene oxide / hectorite compound, well stirring, and subjecting to irradiation of high-power electron beams to obtain graphene oxide / hectorite / chitosan aerogel; impregnating in methanol solution of polyethyleneimine to realize surface modification; quicklyfreezing the graphene oxide / hectorite / chitosan aerogel by liquid nitrogen, and drying in a vacuum freezing environment to obtain the graphene oxide / hectorite / chitosan aerogel solid amine adsorbent.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide adsorbents, in particular to a graphene oxide / hectorite / chitosan airgel-type solid amine adsorbent crosslinked by electron beam irradiation and a preparation method and application thereof. Background technique [0002] In recent years, the continuous large-scale emission of carbon dioxide has intensified the greenhouse effect and global warming, seriously damaging the ecological environment and endangering the survival of human beings. At the same time, as an important resource, carbon dioxide is widely used in many fields such as chemical industry, food, medicine, electronics, and agriculture, and has high potential value. Therefore, how to efficiently capture and separate carbon dioxide has become an increasingly urgent problem in research. [0003] Currently, carbon dioxide absorption methods mainly include physical adsorption, chemical absorption, membrane separation, and electrochemi...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2253/25B01D2257/504B01J20/10B01J20/20B01J20/24B01J20/28047B01J20/30B01J20/3085Y02C20/40
Inventor 马睿刘志研李耀廖佩珊唐伟
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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