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Method for preparing graphene oxide-alumina composite aerogel

A composite aerogel and graphene technology, applied in aerogel preparation, chemical instruments and methods, colloidal chemistry, etc., can solve the problems of small specific surface area, easy agglomeration of alumina, and achieve rich pore structure and excellent electrical conductivity. , good dispersion effect

Active Publication Date: 2016-09-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alumina prepared at this stage is easy to agglomerate and has a small specific surface area. Therefore, if an effective method can be found to improve the dispersion of alumina, it will have a positive impact on the adsorption and catalytic properties of alumina, which will have a positive impact on improving its industrial application. great significance

Method used

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  • Method for preparing graphene oxide-alumina composite aerogel

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preparation example Construction

[0022] A method for preparing graphene oxide-alumina composite aerogel, using graphene oxide as a raw material to ultrasonically disperse in a solvent, adding a certain amount of aluminum chloride hexahydrate, stirring and refluxing for a certain time at a set temperature, and finally water The cylindrical wet gel is synthesized by thermal method, and after alcohol washing, water washing, and freeze-drying, the ultra-light graphene oxide-alumina composite aerogel is obtained, which specifically includes the following steps:

[0023] Step 1. Take the graphene oxide prepared by the modified Hummer method, add it to the dispersion solvent, sonicate it in an ultrasonic cleaner with 180W ultrasonic power for 1 hour, and separate it with a low-speed centrifuge at a rotation speed of 1000-8000 rpm / min. Filter out the precipitation of the lower layer and take the upper layer solution;

[0024] Wherein, the mass-volume ratio of graphene oxide to the dispersion solvent is 0.3:100˜0.2:50 g / mL...

Embodiment 1

[0031] Step 1. Take 0.3g of graphite oxide, add it to 100ml of distilled water, sonicate it in an ultrasonic cleaner with 180W ultrasonic power for 1h, separate with a low-speed centrifuge, filter out the lower layer of precipitation and take the upper layer solution;

[0032] Step 2. Take 50ml of the solution in Step 1, adjust the pH of the solution to 7.5 with dilute ammonia, then add 2.4143g of aluminum chloride hexahydrate, and react at 80°C for 4 hours;

[0033] Step 3. After the reaction in step 2 is completed, cool to room temperature, magnetically stir for 0.5h, transfer the mixed solution into a PTFE hydrothermal kettle, keep it at 180℃ for 12h, and take out the cylindrical product after the reaction kettle is down to room temperature , Wash with alcohol and water for two to three times, and dry the product in a freeze dryer for 12 hours to obtain the graphene oxide-alumina aerogel composite material.

Embodiment 2

[0035] Step 1. Take 0.2g of graphite oxide, add it to 50ml of water, sonicate it in an ultrasonic cleaner with 180W ultrasonic power for 1h, separate with a low-speed centrifuge, filter out the lower layer of precipitation and take the upper layer solution;

[0036] Step 2. Take 50ml of the solution in Step 1, adjust the pH of the solution to 6 with dilute ammonia, then add 1.2072g of aluminum chloride hexahydrate, and react at 100°C for 5 hours;

[0037] Step 3. After the reaction in step 2 is completed, cool to room temperature, magnetically stir for 0.5h, transfer the mixed solution into a PTFE hydrothermal kettle, keep it at 180℃ for 12h, and take out the cylindrical product after the reaction kettle is down to room temperature , Wash with alcohol and water for two to three times, and dry the product in a freeze dryer for 12 hours to obtain the graphene oxide-alumina aerogel composite material.

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Abstract

The invention discloses a method for preparing a graphene oxide-alumina composite aerogel, wherein the method comprises the following steps: taking graphene oxide, adding the graphene oxide into a dispersing solvent, carrying out ultrasonic treatment for 1 h in an ultrasonic cleaning instrument, separating with a low speed centrifuge, filtering out a lower precipitate, and taking an upper solution; taking the solution, adjusting the pH of the solution with dilute ammonia water and dilute hydrochloric acid, then adding aluminum chloride hexahydrate, and carrying out a reaction; and after the reaction in the second step is finished, cooling to room temperature, carrying out magnetic stirring for 0.5 h, then transferring the mixed solution into a polytetrafluoroethylene hydrothermal kettle, keeping for 12 h at the temperature of 180 DEG C, after the reaction kettle is cooled to room temperature, taking out a cylindrical product, washing the cylindrical product with alcohol and water for two to three times respectively, and drying the product for 12 h in a freeze dryer, to obtain the graphene oxide-alumina aerogel composite material. The ultra-light composite material prepared by the method has rich pore passage structure, can give full play to the excellent electrical conductivity of graphene, and has wide application prospect.

Description

Technical field [0001] The invention relates to the preparation field of organic-inorganic oxide composite aerogel, in particular to a preparation method of graphene oxide-alumina composite aerogel. Background technique [0002] Aerogel is a kind of low-density porous solid material filled with gaseous dispersion medium formed by the mutual aggregation of nano-scale ultrafine particles, and the porosity can be as high as 98.9%. It is currently the lightest solid material in the world, known as "solid smoke". In addition to the basic properties of nanomaterials, aerogel also has many excellent characteristics such as high porosity, low heat transfer coefficient, low density, low conductivity, low refractive index, and low sound propagation speed. It is used in heat insulation refractories, catalysts and Catalyst carriers, sound-absorbing and shock-absorbing materials, new high-energy particle detectors, gas and water purifiers, and special glass precursors have very broad applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 任丽丽贺赫
Owner SOUTHEAST UNIV
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