Graphene aerogel microspheres and preparation method and application thereof

A graphene airgel and graphene technology, applied in the direction of microsphere preparation, microcapsule preparation, chemical instrument and method, etc., can solve the problem of sol-gelling reagents without graphene hydrogel microspheres, which are not suitable for graphite Solve the problems of preparation and low production efficiency of olefin airgel microspheres, and achieve the effects of easy modification and loading, rich oxygen-containing functional groups, and easy operation

Active Publication Date: 2015-12-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method is relatively complicated to operate, and the production efficiency is low, and there is no sol-gelling reagent suitable for preparing graphene hydrogel microspheres, so it is not suitable for the preparation of graphene airgel microspheres.
Therefore, there are no patent literature or non-patent literature reports on graphene airgel microspheres

Method used

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  • Graphene aerogel microspheres and preparation method and application thereof
  • Graphene aerogel microspheres and preparation method and application thereof
  • Graphene aerogel microspheres and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Preparation of graphite oxide: natural graphite was prepared into graphite oxide by Brodie oxidation method.

[0042] (2) Preparation of graphene oxide water dispersion: at room temperature, mix 0.75g of graphite oxide prepared by Brodie oxidation method with 100ml of deionized water, place in an ultrasonic cleaner, 200W ultrasonic dispersion for 20 minutes and then stir overnight to obtain a uniform dispersion. Dark brown 7.5mg / ml graphene oxide aqueous dispersion.

[0043] (3) Put crushed ice in a well-insulated open-top Dewar flask, add sodium chloride powder, and stir evenly to form a crushed ice / sodium chloride cooling bath. Place the beaker with ethyl acetate in a crushed ice / NaCl cooling bath as receiver. At the same time, put the prepared 7.5mg / ml graphene oxide aqueous dispersion into the syringe on the electrostatic spray device, adjust the height of the nozzle of the syringe so that it is separated from the receiving liquid by a suitable distance, adjust...

Embodiment 2

[0047] (1) Preparation of graphite oxide: natural graphite was prepared as graphite oxide by the improved HUMMER method.

[0048] (2) Preparation of graphene oxide aqueous dispersion: at room temperature, mix 1.5g of graphite oxide prepared by the improved HUMMER method with 100ml of deionized water, place in an ultrasonic cleaner, 400W ultrasonic dispersion for 35min and stir overnight to obtain a uniform dispersion 15 mg / ml graphene oxide aqueous dispersion in dark brown color.

[0049](3) Place ethyl acetate in an open Dewar flask with good heat preservation, and add a large amount of liquid nitrogen while stirring until a slush-like liquid nitrogen / ethyl acetate cooling bath is formed. Put the beaker containing toluene and n-hexane into a liquid nitrogen / ethyl acetate cooling bath to cool as the receiving liquid. At the same time, put the prepared 15mg / ml graphene oxide aqueous dispersion into the syringe on the ultrasonic spray device, adjust the height of the nozzle noz...

Embodiment 3

[0053] (1) Preparation of graphite oxide: natural graphite is prepared as graphite oxide by the HUMMER method.

[0054] (2) Preparation of graphene oxide aqueous dispersion: at room temperature, mix 0.5 mg of graphite oxide prepared by the HUMMER method with 100 ml of deionized water, place in an ultrasonic cleaner, 300 W ultrasonic dispersion for 30 min and then stir overnight to obtain a uniformly dispersed dark brown 5mg / ml graphene oxide aqueous dispersion.

[0055] (3) Put the acetone in a well-insulated open Dewar flask, and add dry ice pieces while stirring until it is almost impossible to stir, that is, a viscous dry ice / acetone cooling bath is formed. Cool the beaker containing ethyl acetate and n-heptane in a dry ice / acetone cooling bath as the receiver solution. At the same time, put the prepared 5mg / ml graphene oxide water dispersion into the pressure chamber on the pressure spray device, adjust the height of the nozzle so that it is separated from the receiving l...

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Abstract

The invention discloses graphene aerogel microspheres and a preparation method and application thereof. The preparation method is characterized in that 1, graphite oxide is prepared; 2, graphene oxide aqueous dispersion is prepared; 3, the graphene oxide aqueous dispersion is atomized through a spraying method into graphene oxide liquid drop microspheres, and meanwhile the microspheres are collected through receiving liquid in a cooling bath; 4, the receiving liquid is filtered to obtain graphene oxide ice microspheres, and then freeze drying is performed on the microspheres to obtain graphene oxide aerogel microspheres; 5, the graphene oxide aerogel microspheres are subjected to thermal reduction to obtain the graphene aerogel microspheres. The preparation method is simple and convenient to implement, no environmental pollution is generated, and the obtained graphene aerogel microspheres are uniform in size and large in specific area, are of a stable center-divergence multi-porous-channel network structure and are used for adsorbing environmental pollutants.

Description

technical field [0001] The invention relates to a graphene airgel microsphere, a preparation method and application thereof, and belongs to the field of functional materials. Background technique [0002] Graphene is a new type of two-dimensional material formed by the regular arrangement of carbon atoms in a honeycomb manner. It has superior mechanical properties, electrical properties, optical properties, and thermal properties, so it has attracted extensive attention from people in various fields. Constructing two-dimensional graphene into a three-dimensional graphene macroscopic material is an important method and approach to enable graphene to be truly applied to industrial production under the condition that the excellent properties of graphene are not destroyed. Among them, graphene airgel, as a representative of three-dimensional graphene macroscopic materials, can not only retain the huge specific surface area and excellent properties of graphene, but also have the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00B01J13/02B01J20/20B01J20/30B01J20/28C01B31/04B01D15/08E02B15/04
Inventor 夏和生廖述驰翟天亮
Owner SICHUAN UNIV
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