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
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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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