A kind of graphene aerogel supported by nanometer silver with extremely small particle size and its preparation method and application
A graphene airgel and nano-silver technology, which is applied in the direction of airgel preparation, organic compound preparation, amino compound preparation, etc., can solve the problem of not effectively controlling silver agglomeration, and achieve less agglomeration, small particle size, and preparation simple effect
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Embodiment 1
[0025] In the present embodiment, the specific steps of preparing the graphene airgel supported by nano-silver are as follows:
[0026] (1) Mix 1 mL of 4 mg / mL graphene oxide solution with 1 mL of 24 mg / mL ascorbic acid solution in equal volumes, and form a reducing environment after ultrasonication for 5 minutes to prevent the oxidation of nano-silver in subsequent steps.
[0027] (2) Mix 0.1 mL of ammonia water and 0.5 mg of silver nitrate to obtain a silver ammonia solution, and add it to the solution in step 1. Among them, ammonia water is used as a complexing agent to form a complex between silver ions and ammonia, which reduces the concentration of silver ions, thereby reducing its oxidation ability accordingly, so that the reduction reaction can proceed smoothly.
[0028] (3) Add 0.02 mL of hydrazine hydrate solution into the solution finally obtained in step (2) for complete reduction, and the mass ratio of silver nitrate in the final mixed solution is about 0.025%. T...
Embodiment 2
[0031] In the present embodiment, the specific steps of preparing the graphene airgel supported by nano-silver are as follows:
[0032] (1) Mix 1 mL of 4 mg / mL graphene oxide solution with 1 mL of 24 mg / mL ascorbic acid solution in equal volumes, and form a reducing environment after ultrasonication for 5 minutes to prevent the oxidation of nano-silver in subsequent steps.
[0033] (2) Mix 0.2 mL of ammonia water and 1 mg of silver nitrate to obtain a silver ammonia solution, and add it to the solution in step 1. Among them, ammonia water is used as a complexing agent to form a complex between silver ions and ammonia, which reduces the concentration of silver ions, thereby reducing its oxidation ability accordingly, so that the reduction reaction can proceed smoothly.
[0034] (3) Add 0.04 mL of hydrazine hydrate solution into the solution of step (2) for complete reduction, and the mass ratio of silver nitrate in the final mixed solution is about 0.05%. The whole process was...
Embodiment 3
[0037] In the present embodiment, the specific steps of preparing the graphene airgel supported by nano-silver are as follows:
[0038] (1) Mix 1 mL of 4 mg / mL graphene oxide solution with 1 mL of 24 mg / mL ascorbic acid solution in equal volumes, and form a reducing environment after ultrasonication for 5 minutes to prevent the oxidation of nano-silver in subsequent steps.
[0039] (2) Mix 0.3 mL of ammonia water and 1.5 mg of silver nitrate to obtain a silver ammonia solution, and add it to the solution in step 1. Among them, ammonia water is used as a complexing agent to form a complex between silver ions and ammonia, which reduces the concentration of silver ions, thereby reducing its oxidation ability accordingly, so that the reduction reaction can proceed smoothly.
[0040] (3) Add 0.06 mL of hydrazine hydrate solution into the solution of step (2) for complete reduction, and the mass ratio of silver nitrate in the final mixed solution is about 0.075%. The whole process ...
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Abstract
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