Graphene aerogel as well as preparation method and application thereof
A technology of graphene airgel and elements, applied in the direction of graphene, chemical instruments and methods, and other chemical processes, can solve problems affecting adsorption performance and cycle performance, low adsorption capacity, low adsorption capacity, etc., and achieve good adsorption Performance and oil-water selectivity, broad application prospects, and the effect of improving the degree of reduction
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Embodiment 1
[0101] (1) disperse the graphene oxide prepared by the improved Hummers method in deionized water, and ultrasonically form a uniform graphene oxide dispersion with a concentration of 4 mg / mL;
[0102] (2) Add 4 mg / mL ascorbic acid and 0.25 mg / mL cysteamine to the graphene oxide dispersion prepared in step (1), mix evenly with magnetic stirring, then place in an oven at 95°C for hydrothermal reaction for 1 h , to obtain graphene hydrogel after completion of the reaction;
[0103] (3) Dialyzing the graphene hydrogel prepared in step (2) for 12 hours in an aqueous ethanol solution with a concentration of 10% by volume, and then freeze-drying for 36 hours at a temperature of -80°C to obtain a graphene aerogel , labeled S1.
[0104] S1 was subjected to a field emission scanning electron microscope test, and the results are shown in figure 1 (b) and (d). from figure 1 (b) It can be seen that the surface of S1 is relatively smooth, with some wrinkles on the surface, that is, the ...
Embodiment 2
[0115] (1) disperse the graphene oxide prepared by the improved Hummers method in deionized water, and ultrasonically form a uniform graphene oxide dispersion with a concentration of 4 mg / mL;
[0116] (2) Add 4 mg / mL of ascorbic acid and 1 mg / mL of cysteamine to the graphene oxide dispersion prepared in step (1), stir and mix evenly, and place in an oven with a temperature of 95° C. for hydrothermal reaction for 1 h. After completion of the reaction, graphene hydrogel is obtained;
[0117] (3) Dialyzing the graphene hydrogel prepared in step (2) for 12 hours in an aqueous ethanol solution with a concentration of 10% by volume, and then freeze-drying for 36 hours at a temperature of -80°C to obtain a graphene aerogel , labeled S2.
[0118] The adsorption performance test of S2 shows that the adsorption capacity of S2 to diesel oil is 245g / g, and the adsorption constant is 11.9×10 -3 the s -1 ; The adsorption capacity to tetrahydrofuran is 144g / g, and the adsorption constant ...
Embodiment 3
[0120] (1) disperse the graphene oxide prepared by the improved Hummers method in deionized water, and ultrasonically form a uniform graphene oxide dispersion with a concentration of 4 mg / mL;
[0121] (2) Add 4 mg / mL ascorbic acid and 0.5 mg / mL cysteamine to the graphene oxide dispersion prepared in step (1), stir and mix evenly, then place in an oven at 95°C for hydrothermal reaction for 1 h , to obtain graphene hydrogel after completion of the reaction;
[0122] (3) Dialyzing the graphene hydrogel prepared in step (2) for 12 hours in an aqueous ethanol solution with a concentration of 10% by volume, and then freeze-drying for 36 hours at a temperature of -80°C to obtain a graphene aerogel , labeled S3.
[0123] The adsorption performance test of S3 shows that the adsorption capacity of S3 to diesel oil is 246g / g, and the adsorption constant is 11.8×10 -3 the s -1 ; The adsorption capacity to tetrahydrofuran is 144g / g, and the adsorption constant is 73.4×10 -3 the s -1 ;...
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