Nitrogen-doped carbonized bacterial cellulose/graphene/platinum composite nanomaterial and preparation method thereof
A technology of composite nanomaterials and bacterial cellulose, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor conductivity and poor conductivity of graphene oxide, and achieve easy Immobilization, improvement of catalytic performance, improvement of the effect of conductive fibers
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[0024] The preparation method of a nitrogen-doped carbonized bacterial cellulose / graphene / platinum composite nano material of the present invention, the flow chart is as follows figure 1 As shown, including the following steps:
[0025] The first step: take the flocculent bacterial cellulose statically fermented by Acetobacter xylinum, and use the mass fraction of 0.1%-4% NaOH and 0.1%-4% H 2 O 2 Treat at 60~90℃ for 1~5h. Rinse with continuous running tap water (to obtain pure flocculent bacterial cellulose raw material). Place the treated flocculent bacterial cellulose in a freeze dryer for freeze-drying at a temperature of -47~-54℃, time of 10~24h, for vacuum bag equipment;
[0026] Step 2: Disperse the graphene oxide prepared by the improved Hummers method in water and disperse it with 100W ultrasonic to form a uniform graphene oxide suspension; use a high-speed homogenizer for the prepared flocculent bacterial cellulose at a speed of 15000r / min Homogenize for 30 minutes to obt...
Embodiment 1
[0031] Use 0.1% NaOH and 0.1% H to flocculate bacterial cellulose statically fermented with Acetobacter xylinum 2 O 2 Treated in a water bath at 90℃ for 3h, take it out and rinse with tap water until it is neutral, place it in a freeze dryer for 24h, take it out and homogenize the bacterial cellulose with a high-speed homogenizer at 15000r / min for 30min to obtain a homogeneous bacterial cellulose solution , Then add 10mL graphene oxide suspension, 20℃, 100W ultrasound to make the dispersion uniform, then add dopamine solution, after mechanical stirring at 25℃-30℃ for 2h, add chloroplatinic acid solution to it and continue stirring for 4h; The product was filtered and washed with deionized water to neutrality, and then freeze-dried for 24 hours to obtain a bacterial cellulose / graphene oxide / platinum precursor composite material. Finally, the product was first heated at a heating rate of 2°C / min in a hydrogen / argon mixed atmosphere. The temperature is increased to 400°C, the tempe...
Embodiment 2
[0034] Use 0.2% NaOH and 0.2% H to flocculate bacterial cellulose statically fermented by Acetobacter xylinum 2 O 2 Treat it in a water bath at 80℃ for 2h, take it out and rinse with tap water until it is neutral, place it in a freeze dryer for 20h, take it out and homogenize the bacterial cellulose with a high-speed homogenizer at 10000r / min for 30min to obtain a uniform bacterial cellulose solution , Then add 10mL graphene oxide suspension, 20℃, 100W ultrasound to make the dispersion uniform, then add dopamine solution, after mechanical stirring at 25℃-30℃ for 2h, add chloroplatinic acid solution to it and continue stirring for 4h; The product was filtered and washed with deionized water to neutrality, and then freeze-dried for 24 hours to obtain a bacterial cellulose / graphene oxide / platinum precursor composite material. Finally, the product was first heated at a heating rate of 2°C / min in a hydrogen / argon mixed atmosphere. The temperature is increased to 400°C, the temperatur...
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