Method for preparing high-strength graphite oxide aerogel

A graphene aerogel, high-strength technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve problems such as restricting application and low strength, and achieve controllable shape, large specific surface area, and good mechanical strength. Effect

Inactive Publication Date: 2013-01-23
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of the currently prepared graphene oxide airgel is very low, which restricts its further application.
The p

Method used

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  • Method for preparing high-strength graphite oxide aerogel
  • Method for preparing high-strength graphite oxide aerogel
  • Method for preparing high-strength graphite oxide aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Graphene oxide was formulated into an aqueous solution with a concentration of 2 mg / ml, and ultrasonically oscillated for 2 hours to obtain a well-dispersed graphene oxide aqueous solution. Add 50ml of graphene oxide aqueous solution into a hydrothermal kettle, and treat at 180°C for 20h to prepare graphene oxide hydrogel. Its SEM picture is as follows figure 1 shown. The prepared graphene oxide hydrogel was put into ammonia water, soaked at 90° C. for 1 hour, and freeze-dried to obtain graphene oxide airgel with high mechanical strength.

Embodiment 2

[0019] Graphene oxide was formulated into an aqueous solution with a concentration of 1 mg / ml, and ultrasonically oscillated for 1 hour to obtain a well-dispersed graphene oxide aqueous solution. Add 10 ml of graphene oxide aqueous solution into a hydrothermal kettle, and treat at 150°C for 5 hours to prepare graphene oxide hydrogel. The prepared graphene oxide hydrogel was put into ammonia water, soaked at 60° C. for 5 hours, and freeze-dried to obtain graphene oxide airgel with high mechanical strength.

Embodiment 3

[0021] Graphene oxide was formulated into an aqueous solution with a concentration of 5 mg / ml, and ultrasonically oscillated for 3 hours to obtain a well-dispersed graphene oxide aqueous solution. Add 200ml of graphene oxide aqueous solution into a hydrothermal kettle and treat at 90°C for 20h to prepare graphene oxide hydrogel. The prepared graphene oxide hydrogel was put into ammonia water, soaked at 0°C for 36 hours, and freeze-dried to obtain graphene oxide airgel with high mechanical strength.

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Abstract

The invention discloses a method for preparing high-strength graphite oxide aerogel. The method is characterized by comprising the following processes of: 1) matching graphite oxide powder and deionized water into a water solution with the concentration being 0.1-10mg/ml, carrying out ultrasonic oscillation for 0.1-5 hours, and obtaining a graphite oxide water solution with good dispersion; 2) adding 10-500ml graphite oxide water solution which is allocated in a water heat kettle, treating for 1-24 hours under the temperature of being 90-200 DEG C, and preparing the graphite oxide aerogel; and 3) putting the prepared graphite oxide aerogel into ammonia water, dipping for 1-36 hours under the temperature being 0-150 DEG C, freezing and drying, and obtaining the high-strength graphite oxide aerogel. The method disclosed the invention has the advantages that the preparing method is simple, the mechanical strength of the graphite oxide aerogel can be increased through simple ammonia water treatment on the basis of the graphite oxide aerogel, the energy consumption is low, no pollution exists, a microcosmic porous structure is matched, and the graphite oxide aerogel has a great application prospect in adsorption and catalysis.

Description

technical field [0001] The invention discloses a preparation method of high-strength graphene oxide airgel, and relates to the technical field of three-dimensional self-assembly preparation of graphene oxide. Background technique [0002] Graphene oxide, as an intermediate product in the preparation of graphene by chemical methods, not only has the unique layered structure of graphene, but also has some special properties. A variety of oxygen-containing functional groups (hydroxyl, carboxyl, etc.) on the basal surface and edge of graphene oxide endow it with high chemical activity, and the graphene oxide anion generated by the partial ionization of the carboxyl group enables the sheets to form stable through electrostatic interaction. Graphene oxide hydrogel. Studies have found that graphene oxide can be regarded as an amphiphilic flexible molecule, its conjugated six-membered carbon ring endows it with hydrophobicity, and the oxygen-containing functional groups on its basa...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/198
Inventor 杨俊和韩卓唐志红
Owner UNIV OF SHANGHAI FOR SCI & TECH
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