A kind of preparation method of graphene oxide-alumina composite airgel
A composite airgel and graphene technology, applied in airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of easy agglomeration of alumina and small specific surface area, and achieve excellent electrical conductivity and rich pore structure , good dispersion effect
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[0022] A preparation method of graphene oxide-alumina composite airgel, using graphene oxide as a raw material to ultrasonically disperse in a solvent, then adding a certain amount of aluminum chloride hexahydrate, stirring and refluxing at a set temperature for a certain period of time, and finally using water The cylindrical wet gel is synthesized by thermal method, and after alcohol washing and water washing, freeze-drying is obtained to obtain ultra-light graphene oxide-alumina composite airgel, which specifically includes the following steps:
[0023] Step 1. Take the graphene oxide prepared by the modified Hummer method, add it to the dispersing solvent, ultrasonicate it in an ultrasonic cleaner with 180W ultrasonic power for 1h, and separate it with a low-speed centrifuge at a speed of 1000-8000rpm / min. Filter out the precipitation of the lower layer and get the upper layer solution;
[0024] Wherein, the mass volume ratio of graphene oxide to the dispersion solvent is ...
Embodiment 1
[0031] Step 1: Take 0.3g of graphite oxide, add it to 100ml of distilled water, ultrasonicate for 1h in an ultrasonic cleaner with 180W ultrasonic power, separate with a low-speed centrifuge, filter out the precipitate in the lower layer 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 water, then add 2.4143g of aluminum chloride hexahydrate, and react at 80°C for 4h;
[0033] Step 3. After the reaction in step 2 is completed, cool down to room temperature, stir magnetically for 0.5h, transfer the mixed solution into a polytetrafluorohydrothermal kettle, and keep it at 180°C for 12h. After the reaction kettle drops to room temperature, take out the cylindrical product , washed with alcohol and washed with water two to three times each, and dried in a freeze dryer for 12 hours to obtain a graphene oxide-alumina airgel composite material.
Embodiment 2
[0035] Step 1. Take 0.2g of graphite oxide, add it to 50ml of water, ultrasonicate for 1h in an ultrasonic cleaner with 180W ultrasonic power, separate with a low-speed centrifuge, filter out the precipitate in the lower layer 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 water, then add 1.2072g of aluminum chloride hexahydrate, and react at 100°C for 5h;
[0037] Step 3. After the reaction in step 2 is completed, cool down to room temperature, stir magnetically for 0.5h, transfer the mixed solution into a polytetrafluorohydrothermal kettle, and keep it at 180°C for 12h. After the reaction kettle drops to room temperature, take out the cylindrical product , washed with alcohol and washed with water two to three times each, and dried in a freeze dryer for 12 hours to obtain a graphene oxide-alumina airgel composite material.
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