Freeze-drying Machine

Freeze-drying Machine

Freeze-drying technology for preparing sponge-like graphene by freeze-drying machine

Freeze-drying technology for preparing sponge-like graphene by freeze-drying machine! This includes:

1. In 15-60min, add natural graphite to concentrated H2SO4 of ice bath ultrasonic, then add NaNO3, then add potassium permanganate KMnO4 in 15-60min, start timing after all potassium permanganate is added, and the reaction is 0.5- 1h to obtain a mixed solution;

2. Stir the above mixture in a 30-35°C water bath for 0.5-1.5h, add deionized water to the mixture, heat to 95-100°C, continue stirring for 20-30min, and then add deionized water and hydrogen peroxide , and then separated, washed, freeze-dried in a freeze-drying machine, and thermally stripped at low pressure to obtain spongy graphene.

The method further optimizes the graphene preparation process, the preparation cycle is short, fast and efficient, the process is simple, easy to operate, has no pollution to the environment and saves energy, and can be popularized and applied.

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