Graphene Lyophilizer

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Graphene lyophilizer

As a new energy in the future, hydrogen energy has become an inevitable development trend. The storage of hydrogen source is the most critical link in the hydrogen energy utilization system. Carbon based nano materials have become a research hotspot of hydrogen storage materials because of their unique structure and properties. As a newly discovered carbon nano material, graphene has a series of advantages, such as large specific surface, stable physicochemical properties, simple preparation process and wide sources of raw materials, which has aroused people's interest in the theoretical and experimental research of its hydrogen storage properties.

The invention relates to a method for preparing spongy graphene by a graphene freeze-drying mechanism. The graphene prepared by this method is loose and porous, has large specific surface area, presents three-dimensional sponge shape, low density, and has the characteristics of ultra light and stable structure. It can be used as adsorption material and composite material, which expands its application.

(1) Ultrasonic blending of raw materials in ice bath

Add natural graphite into the concentrated H2SO4 of ice bath ultrasound within 15-60min, then add NaNO3, and then add potassium permanganate KMnO4 within 15-60min. Start timing after all potassium permanganate is added, and react for 0.5-1h to ensure that the system temperature is not higher than 10 ℃ to obtain the mixed solution.

(2) Oxidation of raw materials in water bath

Stir the above mixed solution in a 30-35 ℃ water bath for 0.5-1.5h, add deionized water to the mixed solution, heat it to 95-100 ℃, continue stirring for 20-30min, then add deionized water and hydrogen peroxide until the solution turns bright yellow and no bubbles are generated (graphite oxide is obtained), and then separate, wash, freeze-dry and low-pressure thermal stripping to obtain spongy graphene. In step (1), the ratio of natural graphite, concentrated H2SO4, NaNO3 and potassium permanganate KMnO4 is 2g: 50ml: 1g: 7g, that is, KMnO4 and concentrated H2SO4 are slightly excessive, and graphite and KMnO4 are slowly added to concentrated H2SO4 in turn, so as to ensure that graphite is fully oxidized and intercalated in the later stage.

Parameter:

Model	KFD-20	KFD-25	KFD-30	KFD-40	KFD-50	KFD-100	KFD-150	KFD-200
Capacity (Kg/Batch)	200	250	300	400	500	1000	1500	2000
Shelf Area (㎡)	20	25	400	40	52	102	152	201
Shelf Size (Mm)	2200*600	2200*600	3300*600	3300*600	3300*600	5000*600	10000*600	9900*600
Shelf Quantity (Layer)	8+1	10+1	8+1	10+1	13+1	17+1	13+1	17+1
Shelf Quantity (Piece)	18	22	18	18	28	36	28	36
Space Between（Mm）	95
Shelf Temperature (℃)	room to 120
Water Catcher Temper (℃)	-65±5
Max Catch Water（Kg）	300	380	450	600	750	1500	2200	3000
Ultimate Vacuum （Pa）	5
Electricity（Kw）	63	72	101	116	168	232	287	384

Pre-sale:

* As soon as we get your inquiry, we will always reply to your email on time and try our best to recommend you the most suitable freeze dryer. Detailed tech-info will also be provided for you.

* We can do sample test for customers.

After-sale:

* If possible, please do come to our factory and we will teach workers the whole process of freeze drying. The most appropriate time needed for freeze drying will be tested by us.

* We will keep in touch with you, to make sure every parts of the freeze dryer work well. One year warranty, free online service for abroad customers.

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