Preparation method of graphene oxide-polyethyleneimine/silicon dioxide composite aerogel

A technology of polyethyleneimine and composite airgel, which is applied in the fields of alkali metal oxides/hydroxides, chemical instruments and methods, and separation methods, and can solve the problems of difficulty in maintaining a complete structure, low carbon dioxide adsorption capacity, and poor mechanical properties and other issues, to achieve the effects of easy access, improved adsorption performance, and low cost

Pending Publication Date: 2021-10-08
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the harsh requirements for temperature and pressure in its preparation process, its disadvantages are also more obvious: it is difficult to maintain a complete structure, poor mechanical properties and too low carbon dioxide adsorption capacity

Method used

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  • Preparation method of graphene oxide-polyethyleneimine/silicon dioxide composite aerogel
  • Preparation method of graphene oxide-polyethyleneimine/silicon dioxide composite aerogel
  • Preparation method of graphene oxide-polyethyleneimine/silicon dioxide composite aerogel

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Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1. Peel off the graphene oxide aqueous solution with a concentration of 2 mg / mL in an ultrasonic water bath for 1 h to obtain a uniformly dispersed graphene oxide dispersion, and then adjust the pH value to 8.0 with a sodium hydroxide aqueous solution with a concentration of 4 mg / mL;

[0031] Step 2. Mix the graphene oxide dispersion after adjusting the pH value in step 1 with the polyethyleneimine aqueous solution with a concentration of 10 mg / mL according to a volume ratio of 1:1 to prepare a graphene oxide-polyethyleneimine mixed solution , and immerse and condense for 24 hours at a low temperature of 0°C;

[0032] Step 3: Pour the graphene oxide-polyethyleneimine mixture that has been soaked and condensed in step 2 into the mold, cover it with a plastic wrap and make small holes in the plastic wrap, keep it warm at 20°C for 24 hours, and then Remove the membrane and soak in deionized water for 1 hour to ob...

Embodiment 2

[0039] The difference between this embodiment and Example 1 is that: the graphene oxide aqueous solution with a concentration of 5 mg / mL is selected in step one; the polyethyleneimine aqueous solution with a concentration of 20 mg / mL is selected in step two; Keep the temperature and keep it for 18 hours; in step 4, prepare the silicon dioxide precursor solution with the silicon water ratio of 1:5 between the precursor and water, control the silicon content at 1.2mol / L, and put the hydrogel at a low temperature of 0°C Soak and coagulate for 18 hours under the same conditions.

Embodiment 3

[0041] The difference between this embodiment and Example 1 is that in step 1, the graphene oxide aqueous solution with a concentration of 10 mg / mL is selected; in step 2, a polyethyleneimine aqueous solution with a concentration of 30 mg / mL is selected; Keep the temperature and keep it for 12 hours; in step 4, the precursor and water are prepared according to the silicon-water ratio of 1:7 to prepare the silicon dioxide precursor solution, and the silicon content is controlled at 1.6mol / L. Soak and coagulate for 12 hours under the same conditions.

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Abstract

The invention discloses a preparation method of graphene oxide-polyethyleneimine / silicon dioxide composite aerogel. The method comprises the steps of 1, carrying out ultrasonic treatment on a graphene oxide aqueous solution to obtain a graphene oxide dispersion liquid, and adjusting the pH value of the graphene oxide dispersion liquid; 2, mixing the graphene oxide dispersion liquid with a polyethyleneimine aqueous solution to obtain a graphene oxide-polyethyleneimine mixed solution; 3, after entering a mold, keeping the temperature and standing to obtain graphene oxide-polyethyleneimine hydrogel; 4, adding a silicon dioxide precursor solution into the graphene oxide-polyethyleneimine hydrogel, soaking and condensing to obtain composite hydrogel; and 5, carrying out solution replacement and freeze drying to obtain the graphene oxide-polyethyleneimine / silicon dioxide composite aerogel. According to the preparation method, the graphene oxide-polyethyleneimine hydrogel with a communicated pore channel structure is firstly prepared, then the composite silicon dioxide is impregnated to obtain the composite aerogel, the loading capacity of amine functional groups is improved, the sensitive crushing phenomenon of the silicon dioxide gel is avoided, and the adsorption performance of the composite aerogel is improved.

Description

technical field [0001] The invention belongs to the technical field of airgel composite materials, and in particular relates to a preparation method of graphene oxide-polyethyleneimine / silica composite airgel. Background technique [0002] Greenhouse gases, especially carbon dioxide, have been released into the atmosphere in increasing quantities in recent years through activities such as combustion and industrial emissions. Due to their high absorptive capacity, they are closely related to the observed increase in surface temperature as well as global temperature change. Therefore, in order to reduce the potential risks of greenhouse gases to climate change and the health of natural ecosystems, and reduce the emission of carbon dioxide in the atmosphere, it is imminent to design and prepare materials with recyclability, high pressure resistance and large carbon dioxide adsorption capacity. [0003] Graphene is a special two-dimensional honeycomb material composed of carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01D53/04B01J20/30
CPCB01J20/20B01J20/261B01J20/103B01J20/28047B01D53/04B01D2257/504Y02C20/40
Inventor 宋梦珊杜岩贺加贝刘跃雷诚心于佳石
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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