A kind of preparation method of two-dimensional porous silica nanosheet

A technology of porous silica and nano-silica, applied in the direction of silica, silicon oxide, nanotechnology, etc., to achieve high yield, wide application value, and high repeatability

Inactive Publication Date: 2011-12-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, no one has prepared other new two-dimen

Method used

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  • A kind of preparation method of two-dimensional porous silica nanosheet
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  • A kind of preparation method of two-dimensional porous silica nanosheet

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Experimental program
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Embodiment 1

[0016] Step (1). With 10mg graphene oxide (for its infrared spectrum, see figure 2 Middle curve a), 50mg of tetraethyl orthosilicate, 10mg of ammonia water with a concentration of 30%, and 50g of mixed solvent were added to the reactor, and after ultrasonication for 10 minutes, stirring was carried out for 105 minutes to form a nano-silica supported graphene oxide solution ( The infrared spectrum of graphene oxide supported by nano-silica in solution is shown in figure 2 Middle curve b); the mixed solvent is a mixture of water and ethanol with a volume ratio of 1:5;

[0017] Step (2). After centrifuging the graphene oxide solution supported by nano-silica, pour off the supernatant, then add dehydrated alcohol equal to the volume of the supernatant that was poured out this time; centrifuge again, and pour off the supernatant 1. Add the same volume of absolute ethanol as the supernatant that was poured out this time; centrifuge for the third time, pour off the supernatant, ad...

Embodiment 2

[0021] Step (1). Add 100mg of graphene oxide, 1g of tetraethyl orthosilicate, 10g of ammonia water with a concentration of 10%, and 200g of mixed solvent into the reactor. After ultrasonication for 60 minutes, stir for 24 hours to form a nano-silica load. Graphene oxide solution; The mixed solvent is a mixed solution of water and ethanol with a volume ratio of 1:5;

[0022] Step (2). After centrifuging the graphene oxide solution supported by nano-silica, pour off the supernatant, then add dehydrated alcohol equal to the volume of the supernatant that was poured out this time; centrifuge again, and pour off the supernatant 1. Add the same volume of absolute ethanol as the supernatant that was poured out this time; centrifuge for the third time, pour off the supernatant, add absolute ethanol that is the same volume as the supernatant that was poured out this time; centrifuge for the fourth time , after discarding the supernatant, the centrifuged product was dissolved in water e...

Embodiment 3

[0026] Step (1). Add 20mg of graphene oxide, 400mg of tetraethyl orthosilicate, 200mg of ammonia water with a concentration of 20%, and 240g of mixed solvent into the reactor. After ultrasonication for 30 minutes, stir for 12 hours to form a nano-silica load. Graphene oxide solution; The mixed solvent is a mixed solution of water and ethanol with a volume ratio of 1:5;

[0027] Step (2). After centrifuging the graphene oxide solution supported by nano-silica, pour off the supernatant, then add dehydrated alcohol equal to the volume of the supernatant that was poured out this time; centrifuge again, and pour off the supernatant 1. Add the same volume of absolute ethanol as the supernatant that was poured out this time; centrifuge for the third time, pour off the supernatant, add absolute ethanol that is the same volume as the supernatant that was poured out this time; centrifuge for the fourth time , after pouring off the supernatant, the centrifuged product was dissolved in wa...

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Abstract

The invention relates to a preparation method of a two-dimensional porous silicon dioxide nanosheet. In the method of the present invention, firstly, graphene oxide, tetraethyl orthosilicate, ammonia water, and a mixed solvent are mixed and then ultrasonically stirred to form a nano-silica-loaded graphene oxide solution, and then the nano-silica-loaded graphene oxide solution is centrifuged , Dissolve in water after washing to form a graphene oxide aqueous solution supported by nano-silica, freeze into a solid state and dry to form a flocculent silica-loaded graphene oxide hybrid; the silica-loaded graphene oxide hybrid The compound is calcined at 400-800° C. for 2-8 hours to obtain two-dimensional porous silicon dioxide nanosheets. The method of the invention has no pollution to the environment, is energy-saving and environment-friendly, has simple and easy operation, strong controllability, high repeatability, high yield, is green and environment-friendly, and can realize large-scale production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a preparation method of a two-dimensional material, in particular to a preparation method of a porous silicon dioxide nanosheet. Background technique [0002] For a long time, the simple and large-scale synthesis of two-dimensional molecules or nanomaterials has been a big problem in the scientific and industrial circles, because there has been a lack of ideal templates for preparing two-dimensional nanomaterials. In 2004, the Geim research group successfully peeled three-dimensional graphite into a single-layer graphite with only a single atomic layer thickness by peeling off scotch tape. This is graphene that has attracted widespread interest and attention from the scientific community in recent years (A. K. Geim , et al., Science, 2004, 306, 666-669). Graphene has many special properties with potential applications, such as high Young's modulus (about 1100 GPa), fract...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y40/00
Inventor 高超寇亮
Owner ZHEJIANG UNIV
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